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PSMC Designer User Guide

1. sync out Period Event Rising Event VENT per DS41671A page 36 2012 Microchip Technology Inc PSMC DESIGNER MICROCHIP USER S GUIDE Chapter 3 PSMC Tips The following sections provide useful tips for getting the most out of the PSMC peripheral 3 1 VARIABLE PERIOD WITH FIXED OFF TIME Some power supply designs use a fixed off time and then vary the duty cycle by asynchronous feedback to terminate drive time and also start a new period The first configuration that comes to mind is shown in Figure 3 1 and is setup as follows Period event Asynchronous feedback Rising event Synchronous time set to desired fixed off time Falling event Asynchronous feedback same source as period event FIGURE 3 1 FIXED OFF TIME WITH RISING EVENT DELAY Asynchronous Synchronous Falling Event amp Rising Event Period Event Fixed Off Variable Time On Time This will not work because the timing of the asynchronous event relative to the psmc_clk may cause the rising event to be suppressed An alternate method shown in Figure 3 2 with Falling Event Delay uses a fixed falling event delay which avoids the timing issue is setup as follows Period event Asynchronous feedback Rising event Synchronous time set to zero Falling event Synchronous time set to desired fixed off time Shutdown level Low Output polarity Inverted 2012 Microchip Technology Inc DS4
2. MICROCHIP PSMC Designer User s Guide DS41671A Note the following details of the code protection feature on Microchip devices Microchip products meet the specification contained in their particular Microchip Data Sheet Microchip believes that its family of products is one of the most secure families of its kind on the market today when used in the intended manner and under normal conditions There are dishonest and possibly illegal methods used to breach the code protection feature All of these methods to our knowledge require using the Microchip products in a manner outside the operating specifications contained in Microchip s Data Sheets Most likely the person doing so is engaged in theft of intellectual property Microchip is willing to work with the customer who is concerned about the integrity of their code Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code Code protection does not mean that we are guaranteeing the product as unbreakable Code protection is constantly evolving We at Microchip are committed to continuously improving the code protection features of our products Attempts to break Microchip s code protection feature may be a violation of the Digital Millennium Copyright Act If such acts allow unauthorized access to your software or other copyrighted work you may have a right to sue for relief under that Act Information contained in thi
3. 2 16 1 Synchronous Selection Synchronous rising event selection is made by clicking on the X leading to the upper input to the output OR gate When clicked the X is replaced by a straight line leading from the rising event time selection box to the output OR gate Synchronous rising events can be deselected by clicking on the input line to the OR gate to change it back to a line terminated with an X The radio button below the text box selects time or percent as the display When time is selected then the time entered in the text box will determine the number of microseconds the synchronous rising event will occur after the period event When a time value is entered then the rising event count value is calculated based on the psmc clk frequency If the display mode is changed then the displayed value changes to correspond with the existing count Likewise if the psmc_c1k frequency is changed then the rising event displayed value will be changed to correspond with the existing count except when the percent display mode is selected The count remains constant and the displayed value changes to avoid invalid time entries as a result of a change to the psmc_clk value Entering the value as percent determines the percentage of the period the rising event will occur after the period event When the percent value is entered then the rising event count is calculated based on the existing period count value Unlike the time value the percent value remains
4. XXXXX is the document number and A is the revision level of the document For the most up to date information on development tools see the MPLAB IDE online help Select the Help menu and then Topics to open a list of available online help files INTRODUCTION This chapter contains general information that will be useful to know before using the PSMC Designer Items discussed in this chapter include e Conventions Used in this Guide e The Microchip Web Site e Customer Support e Document Revision History DOCUMENT LAYOUT This document describes how to use the PSMC Designer The document is organized as follows Chapter 1 PSMC Designer Overview e Chapter 2 Main PSMC Configuration GUI O 2012 Microchip Technology Inc DS41671A page 5 PSMC Designer User s Guide CONVENTIONS USED IN THIS GUIDE This manual uses the following documentation conventions DOCUMENTATION CONVENTIONS Description Represents Examples Arial font Italic characters Referenced books MPLAB IDE User s Guide Emphasized text is the only compiler Initial caps A window the Output window A dialog the Settings dialog A menu selection select Enable Programmer Quotes A field name in a window or Save project before build dialog Underlined italic text with A menu path File gt Save right angle bracket Bold characters A dialog button Click OK A tab Click the Power tab N R
5. Now consider how this affects the three PSMCs generating the three PWMs in the three phase waveform The first PSMC is the master for the second PSMC The second PSMC is the slave of the first PSMC but is also the master to the third PSMC The third PSMC is the slave of the second PSMC and master of none Setup for the three PSMCs of a PIC16 L F1786 is as follows Select the PIC16 L F1786 and PSMC1 Click on the Sync function Set rising event as the sync output Click on the Timer function Set the sync source to Off Click on the Period Event function Set the period event time to the desired value Click on the upper input line to the output OR gate to make the synchronous connection Click on the Rising Event function Set the rising event delay to the desired phase offset Click on the upper input line to the output OR gate to make the synchronous connection Click on the Falling Event function Set the falling event duty cycle to the desired value Click on the upper input line to the output OR gate to make the synchronous connection Click on the Modulation function Enable modulation and set the source to CM4 SYNC DS41671A page 38 2012 Microchip Technology Inc PSMC Tips Click on the Mode Control function Click on the tab to set the desired PWM mode Click on the Output Control function Connect the steering if needed channel polarity and desired outputs to pins Check the PSMC enable box Write
6. RBO is that input in Figure 2 4 There is a buffer between the input label and the first AND gate The polarity of the I O pin input is selectable by clicking on the output of the buffer When the buffer output is a line clicking on it will change the line to a bubble indicating that the signal is inverted Clicking on the bubble will change the output to a line 2 15 PERIOD EVENT The period event GUI shown in Figure 2 5 is opened by clicking on the period event block in the main GUI The period event determines the frequency of the PSMC PWM waveform Each period event resets the timer The period event source can be synchronous or asynchronous FIGURE 2 5 PERIOD CONTROL Period Control Period Time us Interrupt 0 000 Freq RBOB x Period Event Reserved x Reserved X CM4 SYNC_B X CM3 SYNC_B X CM2 SYNC_B X CM1 SYNC_B X Hide 2 15 1 Synchronous Selection Synchronous period event selection is made by clicking on the X leading to the upper input to the output OR gate When clicked the X is replaced by a straight line leading from the period time selection box to the output OR gate Synchronous period events can be deselected by clicking on the input line to the OR gate to change it back to a line terminated with an X O 2012 Microchip Technology Inc DS41671A page 17 PSMC Designer User s Guide The synchronous pe
7. constant when the psmc_c1k or period values are changed This is possible because the new rising event count as a result of changes to the psmc_c1k will always be valid 2 16 2 Asynchronous Selection Asynchronous rising events are selected by clicking on any X leading to the 7 wide OR gate of the control Inputs are identified by source signal name appended by a _B which indicates that the signal first passed through the blanking function Input selections vary by device When all selections are open then the connection to the output OR gate is shown as open This connection cannot be changed by clicking Instead it closes automatically when any asynchronous input is selected 2012 Microchip Technology Inc DS41671A page 19 PSMC Designer User s Guide 2 16 3 Interrupt The synchronous rising event can be selected as a timed interrupt source by clicking on the switch image leading to the line labeled as interrupt Closing this switch connects the synchronous rising event out to the PMSC timed interrupt summary bit in the device PIRx register Enabling the synchronous rising event interrupt also requires checking the timed event interrupt enable box on the main window 2 17 FALLING EVENT The falling event control GUI shown in Figure 2 7 is opened by clicking on the falling event block in the main GUI The falling event terminates the active PWM drive output The falling event source can be synchronous or asynchronous F
8. in the comments section notes about Phase 1 of this 3 phase setup Copy this setup using the Copy and Show button Select PSMC2 Paste the configuration copied from PSMC1 by clicking on the Paste button Click on the Timer function Change the sync source to PSMC1 Click on the Modulation function Disable modulation Click on the Output Control function Change if necessary the steering polarity and channel outputs to pins Write in the comments section notes about Phase 2 of this 3 phase setup All other settings are the same as PSMC1 and need not be changed Select PSMC3 Paste the configuration copied from PSMC1 by clicking on the Paste button Click on the Timer function Change the sync source to PSMC2 Click on the Output Control function Change if necessary the steering polar ity and channel outputs to pins Write in the comments section notes about Phase 3 of this 3 phase setup All other settings are the same as PSMC2 and need not be changed Use the file pull down menu to save the three phase configuration setup as a C or Assembly code include file If your project initialization routine does not include the I O pin initialization for the PSMC outputs then add that initialization code to your project Also add the reference to your project to include the PSMC configuration file Modulation has been used in this setup so that the 3 phase output starts in order with PSMC1 operating first when the modulation source is high
9. is a hand will open a control GUI for the function to which the hand is pointing When you are finished configuring that block you can either close the associated GUI or leave it open All functions remain active whether or not they are visible 2 3 DEVICE SELECTION Selecting the device is the first step in creating a PSMC configuration The Device combination box lists all devices with PSMC peripherals Make the selection by scrolling through the list to the desired device The device selection also configures controls for all PSMC instances in that device with the proper input and output names associated with that device 2 4 PSMC SELECTION Selecting the desired PSMC instance is the second step in creating a PSMC configuration Make the selection by scrolling through the list to the desired PSMC instance The PSMC selection also configures all other controls with the proper input and output names associated with that PSMC instance 25 PSMC ENABLE This checkbox in the main GUI enables or disables the currently selected PSMC of the currently selected device 2 6 INTERRUPT ENABLES The interrupt enable checkboxes in the main GUI enable or disable the corresponding bit of the PIEx register for the currently selected PSMC of the currently selected device 2 6 1 Timed Event Interrupt Enable The timed event enable is the summary enable bit for the timed event interrupts 2 6 2 Auto Shutdown Interrupt Enable The auto shutdown enable is
10. the PWM output occurs as it normally would in the Single PWM mode Pulse Skipping mode is generally used in hysteretic power conversion applications Channel A is the only available output in Pulse Skipping mode 2012 Microchip Technology Inc DS41671A page 27 PSMC Designer User s Guide FIGURE 2 16 PULSE SKIPPING MODE PSMC Mode lea spwm spwmc Ppp ppc Fepp FBPPC PS psc ECCPR ECCPF Foc FDCC 3PH Pulse Skipping Channel B S Channel C gt Channel D ye Channel Es Channel F S Period Event Hide 2 19 9 PSC Pulse Skipping with Complementary Output Pulse skipping with complementary output is selected by clicking on the PSC tab as shown in Figure 2 17 Pulse skipping with complementary output is identical to Pulse Skipping mode with the complement of the PWM output to Channel B Click on either dead band block to open the dead band control See Section 2 19 1 Dead Band Control for more information FIGURE 2 17 PULSE SKIPPING COMPLEMENTARY PSMC Mode E SPWM SPWMC PP PPC FBPP FBPPC PS PSC ECCPR ECCPF FDC FDCC 3PH Pulse Skipping Complementary Deadband Channel C Channel D ye Channel E Channel F X gt AsyncRising Event Period Event Hide DS41671A page 28 O 2012 Microchip Technology Inc Main PSMC Configuration GUI
11. 1671A page 37 PSMC Designer User s Guide FIGURE 3 2 FIXED OFF TIME WITH FALLING EVENT DELAY Synchronous Asynchronous Period Event 8 ii Falling Event Synchronous Rising Event Inverted Fixed Off Variable Time On Time This method inverts the output so that the synchronous duty cycle becomes the off time and the off time after the duty cycle end becomes the on time Use auto shutdown to start and stop the application 3 2 3 PHASE VARIABLE DUTY CYCLE 3 Phase applications such as power supplies AC induction motors and tri color LED lighting require three PWMs with a fixed phase offset from each other These applications also require a variance of the PWM duty cycle from 0 to 100 The rising event phase delay alone cannot be used to offset the waveforms because the rising event delay subtracts from the time available for the duty cycle For example ifa period has 100 microseconds and the rising event time is 30 microseconds then the falling event time after the rising event can be no larger than 70 microseconds which is a maximum duty cycle of 70 Phase delay can be implemented without losing duty cycle range by selecting the rising event sync output option When that option is selected then the synchronous rising event time defaults to zero In other words the rising event time is the master s phase delayed sync output and the master s synchronous rising edge event occurs at the master s period event
12. 2 19 10 ECCPR ECC PWM Full Bridge Mode Reverse Direction ECC compatible PWM mode reverse direction is selected by clicking on the ECCPR tab as shown in Figure 2 18 This is a full bridge driver with two of four outputs Channels A and D active The Channel A output is the PWM drive and the Channel D output is true without Pulse Width Modulation This mode is intended to drive the high side and low side of opposite sides of an H bridge power device configuration Such configurations are used in brushed DC motor applications that need both speed and direction control This mode is compatible with the Full Bridge mode of the ECCP peripheral The mode can be changed to the forward direction mode by clicking on the direction switch or clicking on the ECCPF tab When the motor is running and the direction is changed then the change is synchronized with the period event and dead band time is inserted to prevent shoot through on either side of the H bridge Click on either dead band block to open the corresponding dead band control See Section 2 19 1 Dead Band Control for more information FIGURE 2 18 ECC PWM FULL BRIDGE REVERSE sewm sewmc rr pre FePpP FePPC PS psc ECCPR eccer Foc FDCC 3PH ECCP Full Bridge Reverse Deadband x ChannelE ChannelF X gt 2012 Microchip Technology Inc DS41671A page 29 PSMC Designer User s Guide 2 19 11 ECCPF ECC PWM Full Bridge Mode Forward Dire
13. 473 2460 Fax 86 25 8473 2470 China Qingdao Tel 86 532 8502 7355 Fax 86 532 8502 7205 China Shanghai Tel 86 21 5407 5533 Fax 86 21 5407 5066 China Shenyang Tel 86 24 2334 2829 Fax 86 24 2334 2393 China Shenzhen Tel 86 755 8864 2200 Fax 86 755 8203 1760 China Wuhan Tel 86 27 5980 5300 Fax 86 27 5980 5118 China Xian Tel 86 29 8833 7252 Fax 86 29 8833 7256 China Xiamen Tel 86 592 2388138 Fax 86 592 2388130 China Zhuhai Tel 86 756 3210040 Fax 86 756 3210049 ASIA PACIFIC India Bangalore Tel 91 80 3090 4444 Fax 91 80 3090 4123 India New Delhi Tel 91 11 4160 8631 Fax 91 11 4160 8632 India Pune Tel 91 20 2566 1512 Fax 91 20 2566 1513 Japan Osaka Tel 81 6 6152 7160 Fax 81 6 6152 9310 Japan Tokyo Tel 81 3 6880 3770 Fax 81 3 6880 3771 Korea Daegu Tel 82 53 744 4301 Fax 82 53 744 4302 Korea Seoul Tel 82 2 554 7200 Fax 82 2 558 5932 or 82 2 558 5934 Malaysia Kuala Lumpur Tel 60 3 6201 9857 Fax 60 3 6201 9859 Malaysia Penang Tel 60 4 227 8870 Fax 60 4 227 4068 Philippines Manila Tel 63 2 634 9065 Fax 63 2 634 9069 Singapore Tel 65 6334 8870 Fax 65 6334 8850 Taiwan Hsin Chu Tel 886 3 5778 366 Fax 886 3 5770 955 Taiwan Kaohsiung Tel 886 7 213 7828 Fax 886 7 330 9305 Taiwan Taipei Tel 886 2 2508 8600 Fax 886 2 2508 0102 Thailand Bangkok Tel 66 2 694 1351 Fax 66 2 694 1350 EUROPE Aus
14. EAD BAND Complementary outputs are generally used to drive power devices connected in series between the power rails The complementary outputs drive the two power devices such that only one is on at a time connecting one of the power rails to the load When the PWM output is active then one rail is connected to the output When the complement is active then the other rail is connected to the output The turn on time of a power device is generally faster than the turn off time It is necessary therefore to disable the drives to both power devices for at least the activation difference to prevent both devices from conducting at the same time This is accomplished with the dead band time Click on either dead band block to open the rising or falling dead band control GUI shown in Figure 2 9 To enable dead band click the switch to connect the AND gate output to the dead band output Enter the desired dead band time in the text box Dead band operates as follows When the input transitions from high to low the output goes low immediately When the input transitions from low to high then the output transition is delayed by the dead band time Note that the dead band controls are identical for all modes In other words changes made to the rising dead band control in one mode will appear in the rising dead band control of all other modes The same is true for the falling dead band control FIGURE 2 9 DEAD BAND CONTROL Rising Deadband Contro
15. IGURE 2 7 FALLING EVENT CONTROL Falling Event Time from rising event us Interru AA 0 000 RBO_B K Falling Event Reserved Xx Reserved x CM4 SYNC_B X CM3 SYNC_B X CM2 SYNC_B X CM1 SYNC_B X 2 17 1 Synchronous Selection Synchronous falling event selection is made by clicking on the X leading to the upper input to the output OR gate When clicked the X is replaced by a straight line leading from the falling event time selection box to the output OR gate Synchronous falling events can be deselected by clicking on the input line to the OR gate to change it back to a line terminated with an X The radio button below the text box selects time or percent as the display When time is selected then the time entered in the text box will determine the number of microseconds the synchronous falling event will occur after the rising event When a time value is entered then the falling event count value is calculated based on the psmc_ clk frequency and the rising event count If the display mode is changed then the displayed value changes to correspond with the existing count Likewise if either the psmc c1k frequency or rising event value is changed then the falling event displayed value will be changed to correspond with the existing count except when the percent display mode is selected The count remains constant and the displayed value changes to avoid i
16. In this example Comparator 4 sync output is used as the modulation source The 3 Phase PWM is started by Comparator 4 output high and stopped by Comparator 4 output low This is accomplished by software setting the C4POL bit to start the PWM and clearing the C4POL bit to stop the PWM The C4ON and C4SYNC bits should both be cleared All other Comparator 4 control bits are don t care 3 3 CENTER WEIGHTED VARIABLE PWM Some applications benefit from a PWM that spreads from the middle of the period instead of expanding from the start of the period This is sometimes referred to as center weighted PWM Center weighted PWM can be accomplished by setting the rising event time to the middle of the period minus half the PWM width and setting the falling event time to the middle of the period plus half the PWM width Figure 3 3 Irregular PWM widths are avoided during the change because the new settings are held until the PxLD bit bit 6 of the PSMCxCON register is set The transfer to the counters is performed synchronous with the PWM period ensuring that both new settings take effect in the same period O 2012 Microchip Technology Inc DS41671A page 39 PSMC Designer User s Guide FIGURE 3 3 CENTER WEIGHTED PWM Period _ Event Falling Event Rising Event DS41671A page 40 O 2012 Microchip Technology Inc PSMC Designer User s Guide NOTES O 2012 Microchip Technology Inc DS41671A page 41 MICROCHIP Worldw
17. Sync Control not available on the PIC16 L F1782 3 The main GUI also contains the following PSMC Selection Paste Button Copy and Show Button PSMC Enable 0 Pull down Menu 1 Device Selection 3 Copy and Show Button 5 Clear Button 7 PSMC SFR Diplays 9 Interrupt Enables 11 Comments sa orRN FIGURE 2 1 MAIN PSMC DESIGNER GUI File Device PIC16 L F1786 PSMC PSMC1 Code Type Y PSMC Enable Copy and Show Assy C Interrupt Enables Auto Shutdown PSMCICON H 80 PSMC1PHL H 10 Y Timed Event PSMCIMDL HO0 PSMCIPHH HOZ PSMCISYNC H 80 PSMC1DCL H 20 PSMCICLK H 00 PSMC1DCH HOZ PSMCIOEN H 03 PSMCIPRL H 40 PSMCIPOL HOZ PSMCIPRH H 06 o c Rising H E F PSMC1BLNK H 00 PSMCIDBR H 00 Il s Falling R Levent PSMCIREBS H 00 PSMCIDBF H 00 PSMC1FEBS H 00 PSMC1FFA H DO Modulation JJ PSMCIPHS H 01 PSMCIBLKR H 00 PSMCIDCS H 01 PSMCIBLKF H 00 Auto PSMCIPRS H 01 PSMCISTRO H03 PSMCIASDC H 00 PSMCISTRI H 00 PSMCIASDL H 00 PSMCIINT H 00 PSMCIASDS HOO PIE4 H 10 Always including comments is good practice Comments are inserted in the code saves O 2012 Microchip Technology Inc DS41671A page 11 PSMC Designer User s Guide 2 2 FUNCTION SELECTION As you move your cursor around the display you will notice that the cursor shape changes to a hand whenever it is within the bounds of one of the function blocks Clicking on the mouse when the cursor
18. The ASE bit can only be cleared if all input sources are low In either case PSMC operation resumes on the first period event after the shutdown is cleared 2012 Microchip Technology Inc DS41671A page 35 PSMC Designer User s Guide FIGURE 2 25 AUTO SHUTDOWN Auto Shutdown Coni Set RB0 B Dominates Reserved x Reserved x CM4 SYNC_B x SHUTDOWN CM3 SYNC_B x CM2 SYNC_B x CM1 SYNC_B x Write ASE low 2 22 SYNC CONTROL NOT AVAILABLE ON THE PIC16 L F1782 3 The sync control shown in Figure 2 26 is opened by clicking on the sync block of the main GUI The synchronization signal output to other PSMC sync inputs may come directly from the period event or from the rising edge event Clicking on the double pole switch selects between the two possibilities When the switch selects the period event as the master PSMC sync source then all slave PSMCs will synchronize their period events to the master This requires the period time for all slave PSMCs to be as long as or longer than the period time of the master When the switch selects the rising event as the master PSMC sync source then the master PSMC rising event defaults to the master PSMC period event and the slave PSMCs period is delayed by the master PSMC rising event time Delaying slaves in this manner retains the 0 to 100 duty cycle range of the master and slave in phase delayed applications FIGURE 2 26 SYNC CONTROL cs
19. anki ci A A a ee 15 2 14 BIANKING TIMES 258 AAA AA MWANA WI WA NAI 16 2 14 2 Rising Event Trigger AA AA AEA RETN 16 2 143 Falling Event Trigger tic d a 17 2 14 4 Asynchronous Input Pin Polarity oooonnnnocnnnninicccnnnocccnnncncncn nano nannancrnnnno no 17 2 19 PROG Event is AA 17 2 15 1 Synchronous Selection s maka ee irinari azwaki terkini kazu ikiua aaa akwa 17 2 15 2 Asynchronous Selection w wwmanananwnnanamunananiwa naanza nn arrancan 18 2 15 3 Asynchronous Polarity not available on PIC16 L F1782 3 18 ZO edu at naa elena los cool 18 2 10 FRISIAG EVO iria ideada 18 2 16 1 Synchronous Selection ooooooocnoccocccncnncccccconnnnnnononcnnnnnnncnnnnnnnnnnrn nn nnnnnnnnn 19 2 16 2 Asynchronous Selection oooooococcccococccncccccccocononoononconncnnnnnnnnnnnnnnnn nn nnnnnnnnn 19 2 16 3 Interrupt it is 20 O 2012 Microchip Technology Inc DS41671A page 3 PSMC Designer User s Guide 2 17 Falling Event ententes aaa 20 2 17 1 Synchronous Selection wi ai aka Sikia aaa Miaka kwa Bawa 20 2 17 2 Asynchronous Selection ooonccccnnnnoccccccnoonncncconannnncnnnnnnnnnnnnnnnnnncnnnnnnnnncnnnns 21 2 17 3 Asynchronous Polarity not available on PIC16 L F1782 3 21 PANAS A A 21 2 18 MOGUIALION AA ie 21 2 18 1 Modulation Source Selection oooononicocccccnnncccccccnnnnnononccnncnnncnnnnnnnnn nn nnnnnno 22 2 18 2 Modulation Enable cccccccceccesecececeececeeeeeeeeeseeeeceae
20. ates an include file containing C configuration code for all PSMCs in the selected device that have been configured Any PSMC instance in the selected device that is clear will not be included in the output O 2012 Microchip Technology Inc DS41671A page 13 PSMC Designer User s Guide 2 113 Load Code Selecting the Load Code menu option retrieves the SFR information from the file and sets the device selection and all PSMC instance configurations contained in the code file The load algorithm automatically recognizes whether the code was saved as C or assembly and reads it accordingly 2 12 CLOCK The clock control determines the rate at which the synchronous event timer blanking timers and dead band timers all increment The clock selections should be made first since the times in the aforementioned controls are all affected by the clock selections The clock control GUI is shown in Figure 2 2 FIGURE 2 2 CLOCK CONTROL ote E Clock Source ENS v Prescale Fl Divide by 1 psmc_clk 16 16 MHz Hide 2 12 1 Clock Source The clock source selects one of three PSMC clock sources e FOSC internal system oscillator 64 MHz 64 MHz clock derived from the 16 MHz HFINTOC by multiplying by 4 PSMCxCLK pin The I O pin designated as the PSMC clock input When either the Fosc or PSMCxCLK pin is selected then the actual frequency is specified by entering the number in MHz in the text box
21. below the clock selection combination box Selecting 64 MHz forces the frequency to 64 MHz which cannot be altered 2 12 2 Prescale The prescale selection determines which of four dividers is used to reduce the selected clock source to the psmc_c1k output frequency The four selections are e Divide by 1 e Divide by 2 e Divide by 4 e Divide by 8 2 13 TIMER The timer control GUI shown in Figure 2 3 is opened by clicking on the timer block in the main GUI The timer is a 16 bit counter to which the synchronous period event rising event and falling event count registers are compared to create their synchronous events DS41671A page 14 O 2012 Microchip Technology Inc Main PSMC Configuration GUI FIGURE 2 3 TIMER CONTROL En Da a smc_clk gt R CYHO Interrupt Period Event Modulation Sync Source Off 16 Bit Value 2 13 1 Sync Source PSMCs in the device can be synchronized to a master PSMC by routing the sync out signal from the master as one of the timer Reset inputs The sync source selection determines the Reset source and thereby also determines which PSMC is the master The number of selections varies by the number of PSMC instances in the device 2 13 2 Timer Interrupt The timer overflow can be selected as a timed interrupt source by clicking on the switch image at the CY terminal of the timer Connecting this switch connects the timer carry
22. caeeeeeeeeeeeeeteeseeaeees 22 2 19 PSMG Modes scooter asin pl con dada dit 22 2 19 1 Dead Band Control cooconoccccccccccncccccnnonoononnnnnnnnncnnnnnnnnn no nnnnnnnnnnnnnn naar nnnnnnnn 23 2 19 2 SPWM Single PWM Mode cooocococccococcccccccccconcnonnnncnnnccnnn ocn nnnn nc nannnnnannncnnnnrs 23 2 19 3 SPWMC Single PWM Mode with Complementary Outputs 24 2 19 4 PP Push Pull Mode siini ae Aa ae k aiaa 25 2 19 5 PPC Push Pull with Complementary Output oococcncococccccccccccccnccanannnncnnoos 25 2 19 6 FBPP Full Bridge Push Pull ooooccconnncconncccnnocccnonocnnonancconrnnononccnnnncnannncnnnne 26 2 19 7 FBPPC Full Bridge Push Pull with Complementary Mode Outputs 27 2 19 8 PS Pulse Skipping Mode ccceceececeeeeeeeeeseceeeecaeeeeeeeeeeetesensensaeees 27 2 19 9 PSC Pulse Skipping with Complementary Output www 28 2 19 10 ECCPR ECC PWM Full Bridge Mode Reverse Direction 29 2 19 11 ECCPF ECC PWM Full Bridge Mode Forward Direction 30 2 19 12 FDC Fixed Duty Cycle Mode wwaananawannanawananaumananaumaaaanazamaazaa 30 2 19 13 Fine Frequency Adjust siens 31 2 19 14 FDCC Fixed Duty Cycle with Complementary Output 31 2 19 15 3PH 3 Phase PWM iii 32 2 20 Output CONTO ess AA Ia Ka AA roads 33 2 20 1 Output Enable iii 34 2 20 2 Output Ste or scout iaa lia 34 2 20 3 Output Steering Synchronization o
23. ces Serial EEPROMs microperipherals nonvolatile memory and analog products In addition Microchip s quality system for the design and manufacture of development systems is ISO 9001 2000 certified DS41671A page 2 2012 Microchip Technology Inc PSMC DESIGNER MICROCHIP USER S GUIDE Table of Contents Chapter 1 PSMC Designer Overview AA anne nn eh AAA AA AWA AA 9 Chapter 2 Main PSMC Configuration GUI 2 1 Introduction EE KW 11 2 2 F unction S lection s ss energie nrtunee 12 2 3 Device Selection ss 12 ZA PSMC SelectiOn sis ques a ico iia dede 12 2 90 PSMC Enable kerse a iaa 12 2 6 InterruptiEnables E EE EE ETET ictericia 12 2 6 1 Timed Event Interrupt Enable ooooocccccncccccccoconconcnnconononcncnnnnnnn no nccnncnnnnnnnns 12 2 6 2 Auto Shutdown Interrupt Enable oooooococonccccococcononccnncnnccnncnnnnnnnn cnn nccnncnnn 12 27 COMMENTS iia ias tidad 12 2 8 Copy and Show BUON isis batidos RE Le tn nee 13 2 81 PSMCSER Diplays acid nicolas dirias 13 2 9 Paste BUON A teeta ated 13 ZO Clear BUMOM E E dane sdusebuatagse asec akakae 13 2 11 Pull down Menu ss ss cion dal hess TA E ad 13 2 111 Save ASSY sien aishi Bawa kaisha Wai a a 13 KUNA WA AA 13 2 11 3 adili AA RT 14 212 Glock oi ed A e a Te aient ad e tes 14 ZAIDA ClOCK Sorel le ee tr enr tr Us E 14 2 122 Prescale reriicicani Wana AAA ais idad 14 2 13 TIMER ii a oca 14 2 13 1 SYNC SOURCE ai ii ake 15 2 13 2 TISA DU ee a td lao Settee eds 15 2 14 Bl
24. ction ECC compatible PWM mode forward direction is selected by clicking on the ECCPF tab as shown in Figure 2 19 This mode is a full bridge driver with two of four outputs Channels B and C active The Channel B output is the PWM drive and the Channel C output is true without Pulse Width Modulation This mode is intended to drive the high side and low side of opposite sides of an H bridge power device configuration Such configurations are used in brushed DC motor applications that need speed and direction control This mode is compatible with the Full Bridge mode of the ECCP peripheral The mode can be changed to the reverse direction mode by clicking on the direction switch or clicking on the ECCPR tab When the motor is running and the direction is changed then the change is synchronized with the period event and dead band time is inserted to prevent shoot through on either side of the H bridge Click on either dead band block to open the corresponding dead band control See Section 2 19 1 Dead Band Control for more information FIGURE 2 19 ECC PWM FULL BRIDGE FORWARD PSMC Mode gt E sewm sewmc rr eec Fepp rerec Ps esc ECCPR ECCPF FDC FDCC 3PH ECCP Full Bridge Forward i Deadband i Deadband ill VOD Forward O x ChannelE ChannelF _ _ _ __ gt Hide 2 19 12 FDC Fixed Duty Cycle Mode Fixed Duty Cycle mode is selected by clicking on the FDC tab a
25. d the PWM output immediately upon an external input or program control The auto shutdown control shown in Figure X Auto Shutdown is opened by clicking on the auto shutdown block in the main GUI 2 21 1 Shutdown Enable Shutdown is enabled by clicking on the switch at the output of the control When shutdown is enabled then a high on any shutdown source will force the PSMC outputs to a predetermined state until the shutdown source goes low and the PSMC is restarted 2 21 2 Shutdown Sources Shutdown sources are selected by clicking on the broken lines leading to the 8 input OR gate The broken line will change to an unbroken line indicating that the connection is made Remove source selections by clicking on the unbroken OR gate input line The ASE switch is a software control bit that provides software generated shutdown events You can preset this bit by clicking on the switch 2 21 3 Shutdown Override Clicking on the ASDOV switch changes the state of the auto shutdown override bit When set this bit forces a shutdown condition that remains in effect as long as the bit is set Manual and automatic restarts have no affect while the ASDOV bit is set 2 21 4 Auto Manual Restart Clicking on the ARSEN switch selects between automatic and manual restart When restart is automatic then the PSMC will resume operation after all shutdown sources are low When restart is manual then the ASE bit must be cleared by software to restart the PSMC
26. es include e PWM Push Pull Full bridge Push Pull Full bridge Pulse skipping High resolution fixed duty cycle 6 step 3 phase operation Every mode except the 6 step has a complementary output mode which drives at least two channels that are the complement of each other The PSMC also supports various driver and feedback configurations with the following programmable features Dead band delays the output drive for a time after the complement of that output turns off Blanking Suppresses feedback signals for a time after the drive transitions on and off Asynchronous inputs pulse Start and Stop events can be triggered by external asynchronous signals in combination with or independent of an internal time base Shutdown immediate safe shutdown driven by an external asynchronous Fault signal Modulation the PWM can be operated as a carrier and modulated by an independent input There are thirty Special Function Registers SFRs in the PSMC configuration setup Setting all thirty registers with the appropriate values for desired operation can be a daunting task The PSMC Designer GUI was created to simplify that effort The GUI divides the PSMC into up to eleven major functions These functions are shown in relation to each other in block diagram format in the main GUI window Clicking on a block opens the control GUI for that function The user is guided through the PSMC configuration design by completing sig
27. gardless of the PORT latch level Modes other than SPWM and SPWMC do not include steering and therefore all steering controls are shown as connected for those modes and cannot be disconnected 2 20 3 Output Steering Synchronization The checkbox in the lower left of the control selects period event steering synchronization When the PWM is active and steering is changed then the synchronized steering change takes effect at the period event immediately following the change When steering synchronization is not enabled then steering changes take effect immediately without waiting for the period event DS41671A page 34 2012 Microchip Technology Inc Main PSMC Configuration GUI 2 20 4 Output Polarity The output polarity control determines the active true level of the channel output The active time starts at the rising event and ends at the falling event Polarity is selected by clicking on the output of the channel buffer The output will appear as a bubble for active low polarity and as a line for active high polarity 2 20 5 Shutdown Level Shutdown level is the level forced on the output when a shutdown condition is active The shutdown level for a channel is selected by clicking on the switch at the input of the shutdown MUX Note that the polarity control is ahead of the shutdown MUX so that the shutdown output level is not affected by the polarity control 2 21 AUTO SHUTDOWN Auto shutdown provides the ability to suspen
28. ge Technology is a registered trademark of Microchip Technology Inc in other countries Analog for the Digital Age Application Maestro BodyCom chipK IT chipKIT logo CodeGuard dsPICDEM dsPICDEM net dsPICworks dsSPEAK ECAN ECONOMONITOR FanSense HI TIDE In Circuit Serial Programming ICSP Mindi MiWi MPASM MPF MPLAB Certified logo MPLIB MPLINK mTouch Omniscient Code Generation PICC PICC 18 PICDEM PICDEM net PICKkit PICtail REAL ICE rfLAB Select Mode SQI Serial Quad I O Total Endurance TSHARC UniWinDriver WiperLock ZENA and Z Scale are trademarks of Microchip Technology Incorporated in the U S A and other countries SQTP is a service mark of Microchip Technology Incorporated in the U S A GestIC and ULPP are registered trademarks of Microchip Technology Germany II GmbH amp Co amp KG a subsidiary of Microchip Technology Inc in other countries All other trademarks mentioned herein are property of their respective companies 2012 Microchip Technology Incorporated Printed in the U S A All Rights Reserved LI Printed on recycled paper ISBN 9781620767696 Microchip received ISO TS 16949 2009 certification for its worldwide headquarters design and wafer fabrication facilities in Chandler and Tempe Arizona Gresham Oregon and design centers in California and India The Company s quality system processes and procedures are for its PIC MCUs and dsPIC DSCs KEELOQ code hopping devi
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30. identical to Push Pull mode except that there are four channels two of which are active at a time with the same waveform Channels A and C alternate with Channels B and D every period event FIGURE 2 14 FULL BRIDGE PUSH PULL MODE x ChannelE Period Event ChannelF X gt DS41671A page 26 2012 Microchip Technology Inc Main PSMC Configuration GUI 2 19 7 FBPPC Full Bridge Push Pull with Complementary Mode Outputs Full Bridge Push Pull Complementary mode is selected by clicking on the FBPPC tab as shown in Figure 2 15 This mode is identical to full bridge push pull with the addition of two complementary outputs on Channel E and Channel F Channel E is the complement of Channels A and C Channel F is the complement of Channels B and D Click on either dead band block to open the dead band control See Section 2 19 1 Dead Band Control for more information FIGURE 2 15 FULL BRIDGE PUSH PULL COMPLEMENTARY PSMC Mode spwm sPwmc PP PPC FBPP FBPPC ps psc ECCPR ECCPF FDC FDCC 3PH Full Bridge Push Pull Complementary Period Event Hide 2 19 8 PS Pulse Skipping Mode Pulse Skipping mode is selected by clicking on the PS tab as shown in Figure 2 16 Pulse Skipping mode uses the asynchronous rising event output to enable the PWM output When the asynchronous input is low at the period event then PWM output for that period is suppressed otherwise
31. l E Deadband Time us E 2 50 2 19 2 SPWM Single PWM Mode Single PWM mode is selected by clicking on the SPWM tab as shown in Figure 2 10 This mode directs the single PWM signal to the six output channels This mode enables output steering which is a means of enabling or disabling any combination of the six channels Output steering selection is discussed in the output control section Output steering can be used to switch the output from one pin to another pin or to enable several outputs simultaneously so they can be connected in parallel to boost the output current drive 2012 Microchip Technology Inc DS41671A page 23 PSMC Designer User s Guide FIGURE 2 10 SINGLE PWM MODE SPWM spwwmc PP Pec reee FBPPC PS esc eccrr eccer FDC Foce 3PH Single PWM 2 193 SPWMC Single PWM Mode with Complementary Outputs The Single PWM Complementary mode is selected by clicking on the SPWMC tab as shown in Figure 2 11 This is identical to Single PWM mode except the output channels are divided into two groups of three One group has the PWM signal and the other group has the complement of the PWM signal Click on either dead band block to open the dead band control See Section 2 19 1 Dead Band Control for more information FIGURE 2 11 SINGLE PWM COMPLEMENTARY MODE spwm SPWMC pp pec FBPP FBPPC PS PSC ECCPR ECCPF FDC Foce 3PH Single PWM Compleme
32. lanking control on the left are the same names but appended by a _B when leaving on the right You will notice that the input signal identifiers in the other GUIs are also appended with a _B as a reminder that those inputs pass through the blanking function and may be blanked 2 14 1 Blanking Times The blanking time is entered in the appropriate text box in microseconds The blanking count value is calculated from the entered time based on the psmc_c1k frequency If the calculated count value exceeds the maximum allowed then a warning dialog will appear indicating the limit If the psmc_c1k frequency is changed then a new time based on the new frequency and existing count will be displayed in the text box 2 14 2 Rising Event Trigger Click on the switch at the blanking time output to enable or disable the rising event blanking trigger Asynchronous inputs are selected for rising event blanking individually by closing the switch to the AND gate output in their path DS41671A page 16 2012 Microchip Technology Inc Main PSMC Configuration GUI 2 143 Falling Event Trigger Click on the switch at the blanking time output to enable or disable the falling event blanking trigger Asynchronous inputs are selected for falling event blanking individually by closing the switch to the AND gate output in their path 2 14 4 Asynchronous Input Pin Polarity One of the asynchronous inputs comes directly from an I O pin For example
33. ly Asked Questions FAQs technical support requests online discussion groups Microchip consultant program member listing Business of Microchip Product selector and ordering guides latest Microchip press releases listing of seminars and events listings of Microchip sales offices distributors and factory representatives CUSTOMER SUPPORT Users of Microchip products can receive assistance through several channels Distributor or Representative e Local Sales Office e Field Application Engineer FAE e Technical Support Customers should contact their distributor representative or field application engineer FAE for support Local sales offices are also available to help customers Technical support is available through the web site at http www microchip com support DOCUMENT REVISION HISTORY Revision A December 2012 Initial Release of this Document XA O 2012 Microchip Technology Inc DS41671A page 7 PSMC Designer User s Guide NOTES DS41671A page 8 O 2012 Microchip Technology Inc PSMC DESIGNER MICROCHIP USER S GUIDE Chapter 1 PSMC Designer Overview INTRODUCTION The PSMC peripheral is a sophisticated programmable switch mode controller intended to operate power conversion applications with little or no software intervention The peripheral capabilities range from simple single channel PWM generation to multi channel complementary waveforms with dead bands between transitions PWM mod
34. nal paths and control options within each function by selecting switch positions Entry boxes for times and frequencies appear within the diagrams where numeric entry is required There are two options for transferring the completed PSMC configuration to your project One is to copy the code into the clipboard buffer which can then be pasted into your source code The other transfer method is to generate an output file that can be included by reference in your source code Include files are also the means by which PSMC configurations are stored for later retrieval by the PSMC designer 2012 Microchip Technology Inc DS41671A page 9 PSMC Designer User s Guide Although a brief description of each function is included at the beginning of each function section please refer to the device data sheet for a more detailed description of the PSMC operation The sections of this guide are arranged in the same order of progression that a user would follow when creating a PSMC configuration DS41671A page 10 O 2012 Microchip Technology Inc PSMC DESIGNER MICROCHIP USER S GUIDE Chapter 2 Main PSMC Configuration GUI 2 1 INTRODUCTION Figure 2 1 shows the main PSMC Designer user interface referred to hereafter as the main GUI Here you will see the eleven major functions of the PSMC 1 Clock 2 Timer 3 Blanking 4 Period Event 5 Rising Event 6 Falling Event 7 Modulation 8 PSMC Modes 9 Output Control 10 Auto Shutdown 11
35. ng control bits to drive two of the six channels at a time one half bridge high side drive and another half bridge low side drive both on A diagram is presented in the top center of the control that indicates the power voltages applied to the system in each phase Phases are labeled U V and W The phase U half bridge is driven by channels A high side and B low side as indicated to the right of the phase labels Phases V and W are labeled similarly You can also select which side of the half bridge receives the Pulse Width Modulation High side low side or both Modulation is selected by the two check boxes to the left of the diagram Clicking on a radio button at the top of the diagram will select that phase drive configuration For example as shown in Figure 2 23 high side modulation is checked and radio button 1 is selected thereby driving phase U high with modulation phase V low with no modulation and phase W floating The channel connections to achieve this configuration are shown on the right DS41671A page 32 2012 Microchip Technology Inc Main PSMC Configuration GUI FIGURE 2 23 3 PHASE PWM PSMC Mode E sewm sPwmc pp PPc repr FBPPC PS psc eccer eccer FDC FDCC 3PH 3 Phase PWM Modulation PhaseSteering off 1 2 3 4 5 6 Y High Side A i i F i Low Side AH Von Hide 2 20 OUTPUT CONTROL Channels are directed to the output pins through the output c
36. nnnn A number in verilog format 4 b0010 2 hF1 where N is the total number of digits R is the radix and n is a digit Text in angle brackets lt gt A key on the keyboard Press lt Enter gt lt F1 gt Courier New font Plain Courier New Sample source code define START Filenames autoexec bat File paths e mecl8 h Keywords _asm endasm static Command line options Opa Opa Bit values Ojo 2 Constants OxFF A Italic Courier New A variable argument file o where file can be any valid filename Square brackets Optional arguments mcc18 options file options Curly brackets and pipe Choice of mutually exclusive errorlevel 011 character arguments an OR selection Ellipses Replaces repeated text var_name var_name Represents code supplied by void main void user DS41671A page 6 2012 Microchip Technology Inc Preface THE MICROCHIP WEB SITE Microchip provides online support via our web site at www microchip com This web site is used as a means to make files and information easily available to customers Accessible by using your favorite Internet browser the web site contains the following information Product Support Data sheets and errata application notes and sample programs design resources user s guides and hardware support documents latest software releases and archived software General Technical Support Frequent
37. ntary Deadband DS41671A page 24 2012 Microchip Technology Inc Main PSMC Configuration GUI 2 194 PP Push Pull Mode The Push Pull mode is selected by clicking on the PP tab as shown in Figure 2 12 The Push pull mode is similar to the PWM mode except that the PWM output alternates between Channel A and Channel B every PWM period FIGURE 2 12 PUSH PULL MODE PSMC Mode sewm sPwmc PP ppc Fepp reeec es psc eccpr eccer Foc FDCC 3PH Push Pull Channel C Channel D SSS x ChannelE ChannelF X gt Period Event Hide 2 19 5 PPC Push Pull with Complementary Output Push Pull Complementary mode is selected by clicking on the PPC tab as shown in Figure 2 13 This mode is identical to the Push Pull mode with the addition of two complementary outputs on Channel E and Channel F Click on either dead band block to open the dead band control See Section 2 19 1 Dead Band Control for more information XP O 2012 Microchip Technology Inc DS41671A page 25 PSMC Designer User s Guide FIGURE 2 13 PUSH PULL COMPLEMENTARY MODE sewm spwwc Pr PPC FBPp Ferec es psc eccer eccer Foc Foce 3PH Push Pull Complementary Channel C gt x Channel D Period Event 2 19 6 FBPP Full Bridge Push Pull Full Bridge Push Pull mode is selected by clicking on the FBPP tab as shown in Figure 2 14 Full Bridge Push Pull mode is
38. nvalid time entries as a result of a change to any of the psmc_clk period or rising event values DS41671A page 20 O 2012 Microchip Technology Inc Main PSMC Configuration GUI Entering the value as percent determines the active pulse width as a percentage of the period The active pulse width is the time from when the PWM output goes active rising event to the time the PWM output is terminated falling event When the percent value is entered then the falling event count is calculated based on the existing period count and rising event values Unlike the time value the percent value remains constant when the psmc_c1k or period values are changed This is possible when the rising event time is zero most applications because the new falling event count as a result of changes to the psmc_c1k and period will always be valid In the unlikely event that a percentage value is entered that causes the falling event count to exceed the period count then a warning dialog will appear and the falling event count will be adjusted to the maximum valid count 2 17 2 Asynchronous Selection Asynchronous falling events are selected by clicking on any X leading to the 7 wide OR gate of the control Inputs are identified by source signal name appended by a _B which indicates that the signal first passed through the blanking function Input selections vary by device When all selections are open then the connection to the output OR gate is shown a
39. ococccnnoccccconononcccconannncncnnnnancncnonanancncnnnns 34 2 20 4 Output Polarity coincidir di dad 35 2 20 5 Shutdown Level ss 35 2 21 AUTO SNUTTOWN MA AA 35 2 21 1 Shutdown Enable oooooccncccocccccccccocccncnnnnnoncnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnns 35 2 21 2 Shutdown Sources su 35 2 21 3 Shutdown Override se e a e a aa aaa LAHA 35 2 21 4 Auto Manual Restart wwwwwwwmemamwmwwi mimi wa wawununawuniwu mwanume 35 2 22 Sync Control not available on the PIC16 L F1782 3 ococcccccccnncccnccnnnno 36 Chapter 3 PSMC Tips 3 1 Variable Period with Fixed Off time ooooooocccccccccccnccncccccnnncnniccnncnnninaninnnnns 37 3 2 3 Phase Variable Duty Cycle oooooocccccconcccconocccnnnnnnnanonnncnnnonnnnnnnnnrrnnnnnnnnnnanos 38 3 3 Center Weighted Variable PWM us 39 DS41671A page 4 O 2012 Microchip Technology Inc PSMC DESIGNER MICROCHIP USER S GUIDE Preface NOTICE TO CUSTOMERS All documentation becomes dated and this manual is no exception Microchip tools and documentation are constantly evolving to meet customer needs so some actual dialogs and or tool descriptions may differ from those in this document Please refer to our web site www microchip com to obtain the latest documentation available Documents are identified with a DS number This number is located on the bottom of each page in front of the page number The numbering convention for the DS number is DSXXXXXA where
40. of the PSMC instance from which they were copied with the Copy and Show button to the presently selected PSMC instance In this manner one PSMC configuration can be created then quickly copied to other desired PSMC instances It is usually easier to make a few changes to a copied configuration than it is to re enter the entire configuration for each PSMC instance Note that the Paste button will not paste values copied from your source code 2 10 CLEAR BUTTON The Clear button clears all SFRs in the presently selected PSMC instance to zero All GUls of the various functions adjust accordingly 2 11 PULL DOWN MENU In the upper left of the main GUI display there is a pull down menu titled File This pull down menu includes the following e Save Assy Code Save C Code e Load Code A file selection dialog will appear when the desired menu item is selected for both saving and loading code A comment section that includes the device number and clock frequency is included in the saved code This is used to reconstruct those parts of the configuration when the code is loaded back into the designer tool 2 11 1 Save Assy Selecting the Save Assy code menu option creates an include file containing assembly configuration code for all PSMCs in the selected device that have been configured Any PSMC instance in the selected device that is clear will not be included in the output 2 11 2 SaveC Selecting the Save C code menu option cre
41. ontrol Open the output control GUI shown in Figure 2 24 by clicking on the output control block in the main GUI There are four selections for each channel in this control 1 Output enable switch furthest to the right 2 Output steering input to the buffer on the left 3 Output polarity bubble on output of the buffer figure 4 Shutdown level switch at input to MUX XA O 2012 Microchip Technology Inc DS41671A page 33 PSMC Designer User s Guide FIGURE 2 24 OUTPUT CONTROL Output Control lea LATCO O Channel A gt O X PSMCIA O O O LO LATC1 Channel B X TER So 3 PSMC1B To O O O LATC2 Channel C X TER So 3 PSMC1C To O O O LATC3 Channel D X e Sox PSMC1D To O O O LATC4 Channel E X TE wX PSMC1E To O O O LATC5 Channel F X Voo So 3 PSMC1F To O O Synchronize Steering With Period Event O SHUTDOWN Hide 2 20 1 Output Enable The output enable switch selects between the PORT latch output and the PSMC channel When the PORT latch output is selected then the output pin is not affected by the PSMC When the PSMC channel is selected then the pin is not affected by the PORT latch 2 20 2 Output Steering Two modes SPWM and SPWMC include steering Steering gives the ability to steer the PWM output to one or more of the six outputs Steering differs from the output enable because when steering is disabled then the pin output is forced false re
42. out to the PMSC timed interrupt summary bit in the device PIRx register Enabling the timer interrupt also requires checking the timed event interrupt enable box on the main window 2 14 BLANKING The blanking control GUI shown in Figure 2 4 is opened by clicking on the blanking block in the main GUI Blanking suppresses the selected inputs for a programmable period of time which starts at either a rising event or falling event or both 2012 Microchip Technology Inc DS41671A page 15 PSMC Designer User s Guide FIGURE 2 4 BLANKING CONTROL Blanking Control Rising Event Falling Event Blanking us JU Blanking us FL 0 00 O 0 00 O O JI O O O RBO ES O O RBO_B O Reserved O O Reserved O Reserved O O Reserved O CM4 SYNC O O CM4 SYNC_B O CM3 SYNC O O CM3 SYNC_B O CM2 SYNC O O CM2 SYNC_B O CM1 SYNC O O CM1 SYNC_B O All asynchronous inputs pass through blanking Rising and falling events are used as the blanking triggers because these are the two events that signal the output power drivers to turn on and off When a power driver switches it can cause spurious transients in the system that can cause false event triggers if not suppressed A blanked input is suppressed for all of the following e Period event e Rising event e Falling event Shutdown event Modulation sources are the only inputs that are not affected by blanking Note that in Figure 2 4 the signal names entering the b
43. pond to the change Note that the displayed frequency is twice the output waveform frequency because the fixed 50 duty cycle is derived by dividing the adjusted period frequency by 2 FIGURE 2 21 FINE FREQUENCY ADJUST CONTROL Fine Frequency Adjust Control El PSMCxPR si Frequency kHz m psmc_clk A Period Event Freq 2 19 14 FDCC Fixed Duty Cycle with Complementary Output Fixed Duty Cycle Complementary Output mode is selected by clicking on the FDCC tab as shown in Figure 2 22 The Fixed Duty Cycle with Complementary Output mode is identical to the Fixed Duty Cycle mode with Channel B output as the complement to Channel A O 2012 Microchip Technology Inc DS41671A page 31 PSMC Designer User s Guide FIGURE 2 22 FIXED DUTY CYCLE COMPLEMENTARY OUTPUT sewm sewwmc pe ere Fepp reeec es psc ECCPR ECCPF FDC FDCC 3PH Fixed Duty Cycle Complementary Deadband Channel C gt Channel D S ye channel ES psmc_clk Channel F AAA Deadband 2 19 15 3PH 3 Phase PWM 3 Phase PWM mode is selected by clicking on the 3PH tab as shown in Figure 2 23 3 Phase PWM is a special mode that generates the waveform for 6 step 3 phase systems such as those for driving brushless DC motors These systems have three half bridges requiring two drive outputs each for a total of six channels This mode uses the steeri
44. r s Guide FIGURE 2 8 MODULATION CONTROL Modulation Control Modulation Source P1MDLBIT Vo On Period Event Enable 2 18 1 Modulation Source Selection The modulation source is selected from one ofthe external asynchronous PSMC inputs or peripheral outputs internal to the device Modulation sources are mutually exclusive The selection is made by choosing the desired source from those available in the Modulation Source combination box Note that when modulation is enabled and the modulation source is low then the Timer is held in Reset This ensures that the first PWM pulse enabled by the modulation going high is a complete PWM period Synchronization with the period event ensures that the last PWM pulse is also a complete period It should be apparent that modulation should only be used when the PWM Q signal is completely synchronous no asynchronous inputs to the period rising or falling events to avoid an incomplete cycle of the first PWM period after modulation starts 2 18 2 Modulation Enable Modulation is enabled by clicking the enable switch to the On position When enabled the modulation signal gates the Q output from the PWM SR latch to the PWM mode input Note that the PWM coming into the modulation function is labeled Q and going out it is labeled MQ Modes that use the PWM signal take their input from the modulation function MQ output When the modulation enable switch is in the Off po
45. riod event frequency is determined by the time or frequency entered in the Period Time Period Freq text box The radio button below the box selects time or frequency as the display When a value is entered the period count value is calculated based on the psmc_c1k frequency If the display mode is changed then the value changes to correspond with the existing count Likewise if the psmc_clk frequency is changed then the period value will be changed to correspond with the existing count 2 15 2 Asynchronous Selection Asynchronous period events are selected by clicking on any X leading to the 7 wide OR gate of the control Inputs are identified by source signal name appended by a _B which indicates that the signal first passed through the blanking function Input selections vary by device When all selections are open then the connection to the output OR gate is shown as open This connection cannot be changed by clicking Instead it closes automatically when any asynchronous input is selected 2 15 3 Asynchronous Polarity not available on PIC16 L F1782 3 The output from the 7 wide OR gate can be clicked to change the polarity of the asynchronous event Figure 4 shows the polarity control enabled to invert the signal The default polarity is not inverted in which case the output will be shown as a straight line The cursor will change to a hand when moved to the polarity selection area The cursor will not change in devices that do not ha
46. s open This connection cannot be changed by clicking Instead it closes automatically when any asynchronous input is selected 2 17 3 Asynchronous Polarity not available on PIC16 L F1782 3 The output from the 7 wide OR gate can be clicked to change the polarity of the asynchronous event Figure 4 shows the polarity control enabled to invert the signal The default polarity is not inverted and the output will be shown as a straight line The cursor will change to a hand when moved to the output selection area The cursor will not change in devices that do not have this feature 2 17 4 Interrupt The synchronous falling event can be selected as a timed interrupt source by clicking on the switch image leading to the line labeled as interrupt Closing this switch connects the synchronous falling event out to the PMSC timed interrupt summary bit in the device PIRx register Enabling the synchronous falling event interrupt also requires checking the timed event interrupt enable box on the main window 2 18 MODULATION The modulation control shown in Figure 2 8 is opened by clicking on the modulation block in the main GUI Modulation is used in applications that need to gate the PWM output on and off For example infrared communications typically have a carrier PWM frequency to pulse the IR emitters which is then modulated on and off by the intelligence data ess rrr AAA A 2012 Microchip Technology Inc DS41671A page 21 PSMC Designer Use
47. s publication regarding device applications and the like is provided only for your convenience and may be superseded by updates lt is your responsibility to ensure that your application meets with your specifications MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED WRITTEN OR ORAL STATUTORY OR OTHERWISE RELATED TO THE INFORMATION INCLUDING BUT NOT LIMITED TO ITS CONDITION QUALITY PERFORMANCE MERCHANTABILITY OR FITNESS FOR PURPOSE Microchip disclaims all liability arising from this information and its use Use of Microchip devices in life support and or safety applications is entirely at the buyer s risk and the buyer agrees to defend indemnify and hold harmless Microchip from any and all damages claims suits or expenses resulting from such use No licenses are conveyed implicitly or otherwise under any Microchip intellectual property rights QUALITY MANAGEMENT SYSTEM CERTIFIED BY DNV ISO TS 16949 Trademarks The Microchip name and logo the Microchip logo dsPIC FlashFlex KEELOQ KEELOQ logo MPLAB PIC PlCmicro PICSTART PIC logo rfPIC SST SST Logo SuperFlash and UNI O are registered trademarks of Microchip Technology Incorporated in the U S A and other countries FilterLab Hampshire HI TECH C Linear Active Thermistor MTP SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U S A Silicon Stora
48. s shown in Figure 2 20 The Fixed Duty Cycle mode is used to generate frequencies with a much higher resolution than is possible with the period count alone This mode provides only 50 duty cycle waveforms and should be used only with synchronous period time generation This mode is generally used in fluorescent lamp ballast controls Course frequency is determined with the period count see synchronous period control ES DS41671A page 30 2012 Microchip Technology Inc Main PSMC Configuration GUI FIGURE 2 20 FIXED DUTY CYCLE PSMC Mode al sewm sPwmc pp pec repr rerec es psc eccPr eccrr FOC FDCC 3PH Fixed Duty Cycle Channel A Channel B gt Channel C X gt Channel D Channel E Channel F AS psmc_clk Hide 2 19 13 Fine Frequency Adjust After the course frequency is determined with the clock and period controls the frequency is fine tuned with the Fine Frequency Adjust control Click on the FFA box to open the fine frequency adjust control shown in Figure 2 21 The combination box in the center of the fixed frequency adjust control shows 16 possible selections based on the psmc_c1k frequency and period count Selections can be made by frequency or time by clicking on the desired display mode radio button When any of the clock frequency period frequency or selection mode is changed then the selection list and displayed selection are updated to corres
49. sition the MQ gate is always enabled thereby passing the unmodulated Q out to the mode inputs 2 19 PSMC MODES The mode function is where the simple PWM signal derived from the rising and falling events becomes something more There are five PWM modes one High Resolution Frequency mode and one Six Step mode that simplifies steering pairs of outputs to the six PWM channels All modes except the Six Step mode have a corresponding complementary output mode making a total of thirteen modes 2 x 6 1 13 The complementary modes include two dead band controls one triggered by the rising edge of the PWM signal and one triggered by the falling edge Modes are selected by clicking on the corresponding tab in the mode selection GUI The tabs are labeled with the acronym of the mode control contained therein There are up to six PWM output channels Not all modes use all six channels Unused channels are indicated by an output line that begins with an X The sections that follow detail each of the thirteen modes DS41671A page 22 2012 Microchip Technology Inc Main PSMC Configuration GUI 2 19 1 Dead Band Control Each of the six complementary modes contains two dead band control blocks One control delays the turn on of the normal PWM output s and the other control delays the turn on of the complementary PWM output s Dead band control does not delay the turn off of either normal or complementary outputs 2 19 1 1 WHAT IS D
50. the enable bit for auto shutdown events 2 7 COMMENTS The comments section in the lower center of the main GUI is where user comments about the PSMC configuration can be entered Each PSMC instance has its own comment data which is displayed when that PSMC is selected Comments entered in this box are included as comments in the saved file output AA x A a ae DS41671A page 12 O 2012 Microchip Technology Inc Main PSMC Configuration GUI 2 8 COPY AND SHOW BUTTON The Copy and Show button does two things It shows all SFR values in the PSMC instance configuration and it copies those values to the clipboard The clipboard format is consistent with the type selected by the Code Type radio buttons C and Assembly are the two options The clipboard capture can be pasted into your source code however code for only the presently selected PSMC instance is in the clipboard Multiple copy and paste operations are required when working with multiple PSMC instances A better method for saving multiple PSMC instances of the same device is the File Save option Files can be saved in either C or Assembly format see Save Assy or Save C 2 8 1 PSMC SFR Diplays The PSMC SFRs are displayed by name and value in the 30 text boxes between the Copy and Show button and the Paste button Only the SFRs for the selected PSMC instance are displayed as indicated by each of the SFR name prefixes 2 9 PASTE BUTTON The Paste button transfers SFR values
51. tria Wels Tel 43 7242 2244 39 Fax 43 7242 2244 393 Denmark Copenhagen Tel 45 4450 2828 Fax 45 4485 2829 France Paris Tel 33 1 69 53 63 20 Fax 33 1 69 30 90 79 Germany Munich Tel 49 89 627 144 0 Fax 49 89 627 144 44 Italy Milan Tel 39 0331 742611 Fax 39 0331 466781 Netherlands Drunen Tel 31 416 690399 Fax 31 416 690340 Spain Madrid Tel 34 91 708 08 90 Fax 34 91 708 08 91 UK Wokingham Tel 44 118 921 5869 Fax 44 118 921 5820 11 29 12 DS41671A page 42 2012 Microchip Technology Inc
52. ve this feature 2 15 4 Interrupt The synchronous period event can be selected as a timed interrupt source by clicking on the switch image leading to the line labeled as interrupt Closing this switch connects the synchronous period event out to the PMSC timed interrupt summary bit in the device PIRx register Enabling the synchronous period event interrupt also requires checking the timed event interrupt enable box on the main window 2 16 RISING EVENT The rising event control GUI shown in Figure 2 6 is opened by clicking on the rising event block in the main GUI The rising event starts the active drive ofthe PWM output The rising event source can be synchronous or asynchronous In most applications the rising event will be synchronous at 0 us after period event In this case starting a PWM drive by an asynchronous input is accomplished by enabling that input in the period control One application for synchronous times greater than 0 is center weighted PWM See Center Weighted Variable PWM in Chapter 3 PSMC Tips DS41671A page 18 O 2012 Microchip Technology Inc Main PSMC Configuration GUI FIGURE 2 6 RISING EVENT CONTROL Rising Event El Interrupt Time from period event us 0 000 Percent RBO_B xX Rising Event Reserved x Reserved x CM4 SYNC BB X CM3 SYNC_B X CM2 SYNC_B X CM1 SYNC_B X Async Rising Event Hide

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