Maxim MAX1402 Power Supply User Manual
Contents
1. JU2 Closed Use CalGain inputs for gain calibration CALGAIN REFIN JU3 Closed Use CalOff inputs for offset calibration CALOFF GND JU4 Closed Use CalOff inputs for offset calibration CALOFF GND 405 Closed Use on board reference U2 REFIN GND Disconnects pin 5 from pin 7 JU6 Open MAX1402 pin 5 digital input DS1 pin 7 current source MAX1400 insert filter between mux and A D Disconnects pin 6 from pin 8 JU7 Open MAX1402 pin 6 digital input DSO pin 8 current source 1400 insert filter between mux and A D JU8 Closed Use on board reference U2 REFIN 2 5V Default trace on top layer of PCB MAXIM 7 COP 00 Evaluate MAX1400 MAX1402 MAX1402 Evaluation Kit Evaluation System Table 4 Guide to Register Bit Functions REGISTER BIT NAME DESCRIPTION COMMS 0 DRDY Start bit is zero DIN pin must be 1 when idle RS2 RSO Register select for subsequent operation RW Selects subsequent read or write operation RESET Causes software reset when set to 1 STDBY Activates standby power down mode when set to 1 FSYNC Inhibits the A D converter when set to 1 GS1 A1 Selects the active channel Selects the active channel 1 Selects the data output rate Selects the data output rate CLK Selects the CLKIN frequ2. D output code for each active channel Although there are nine input channels only certain configurations are allowed Select any single channel or one of the scanning sequences from the Inputs menu AIN 1 6 designates an analog input between the AIN1 pin and the AIN6 pin CALOFF designates the signal between the CALOFF and CALOFF pins CALGAIN designates the signal between the CALGAIN and CALGAIN pins The EV kit software assumes that CALOFF and CALOFF are grounded so that CALOFF measures zero volts Similarly the software assumes that CALGAIN is connected to REFIN and CALGAIN is connected to REFIN so that CALGAIN measures the reference volt age These two points calibrate the code to voltage translation function performed in the software The MAX1400 MAX1402 automatically triggers its mea surements unless the FSYNC control bit is set The evaluation kit software communicates with the MAX1400 MAX1402 at intervals determined by the Update Every combo box To halt this automatic update uncheck the Update Every checkbox or change the Update Every to a value between 100ms and 60000ms Normally the microcontroller collects new data as soon as it becomes available by using the INT pin to trigger an interrupt service routine If the INT pin is not used as an interrupt then the MAX1400 must not be operated in free running mode Check or uncheck the Use INT Interrupt checkbox to configure the evaluation kit soft ware Confi
3. and VREF Next the PGA increases the code per volt pro cessing gain reducing the full scale voltage range by a factor of 1 2 4 8 16 32 64 or 128 Finally the offset correction DAC offsets the voltage range by up to 7 6 of the full scale voltage range Input pins AIN1 and AIN2 are controlled by TF1 Input pins AIN3 and AIN4 are controlled by TF2 Input pin AIN5 is controlled by Input pin AIN6 is the analog common When SCAN 1 the CALOFF and CALGAIN channels are controlled by TF3 When SCAN 0 the CALOFF and CALGAIN channels are controlled by one of the transfer function registers as selected by the A1 and AO bits 00 MAX1400 MAX1402 Evaluate MAX1402 Evaluation Kit Evaluation System For simplicity the EV kit software assumes that all three transfer functions are configured alike Detailed Description of Hardware 01 the MAX1402 is a multichannel high resolution A D converter refer to the MAX1402 data sheet U2 the MAX6025 is a 2 5V reference refer to the MAX6025 data sheet Y1 contains a ceramic resonator and its load capacitors R1 R6 together with C3 08 form anti aliasing input filters R8 and C11 filter the digi tal power supply The analog supply comes through fil ter R7 C10 Input Filtering The EV kit has an RC filter on each input with a time constant of approximately 0 01us 10ns R 100Q C 100pF When scanning between channel
4. signals to the inputs labeled AIN1 AIN5 at the bottom edge of the MAX1402 EV kit board AIN6 is analog common Observe the readout on the screen Recommended Equipment RS 232 to COM Port PC Connection Option Before beginning the following equipment is needed e MAX1402 EV system MAX1402 EV kit 68HC16MODULE DIP e ADC power supply that generates 8VDC to 12VDC at 30 50mA e A user supplied Windows 98 2000 XP computer with an available serial communications port preferably a 9 pin plug A serial cable to connect the computer s serial port to the 68HC16MODULE DIP Note In the following sections software related items are identified by bolding Text in bold refers to items directly from the EV kit software Text in bold and MAXIM underlined refers to items from the Windows 98 2000 XP operating system Connections and Setup 1 Visit the Maxim website www maxim ic com evkit software to download the latest version of the EV kit software Save the EV kit software to a temporary folder and uncompress the file if it is a zip file 2 Install the MAX1402 EV kit software on your com puter by running the INSTALL EXE program The program files are copied and icons are created for them in the Windows Start Programs menu 3 Make sure your 68HC16MODULE DIP module has the Rev 2 0 ROM The software will not function with the Rev 1 0 ROM 4 Carefully connect the boards by aligning the 40 pin header of the MAX14
5. 02 EV kit with the 40 pin con nector of the 68HC 16MODULE DIP module Gently press them together The two boards should be flush against one another 5 Connect the DC power source to the uC module at terminal block J2 located next to the ON OFF switch along the top edge of the uC module Observe the polarity marked on the board 6 Connect a cable from the computer s serial port to the uC module If using a 9 pin serial port use a straight through 9 pin female to male cable If the only available serial port uses a 25 pin connector a standard 25 pin to 9 pin adapter will be required The EV kit software checks the modem status lines CTS DSR and DCD to confirm that the correct port has been selected FILE INSTALL EXE UNINST INI DESCRIPTION Installs the EV kit files on your computer Database for uninstall program Removes the EV kit files from your computer This file is automatically copied to CAWINDOWS during installation UNMAXIM EXE 7 Start the MAX1402 program by opening its icon in the Start Programs menu 8 Turn the power on and slide SW1 to the ON posi tion Select the correct serial port and press the OK button The program will automatically download KIT1402 C16 to the module 9 When the software successfully establishes com munication with the EV kit board you will see a con figuration tool and some other windows Verify that the CLKIN and reference voltage settings are co
6. 19 1440 Rev 2 5 07 MAX1402 Evaluation Kit Evaluation System General Description The MAX1402 evaluation system EV system is a com plete multichannel data acquisition system consisting of a MAX1402 evaluation kit EV kit Maxim 68HC16 micro controller uC module and USBT0232 The MAX1402 is a low power multichannel serial output analog to digital converter ADC Windows 98 2000 XP compatible soft ware provides a handy user interface to exercise the MAX1402 s features Source code in C and 68HC11 assembly language is provided for the low level portion of the software Order the EV system for comprehensive evaluation of the MAX1402 using a personal computer Order only the EV kit if the 68HC16 uC module has already been purchased with a previous Maxim EV system or for custom use in other uC based systems The MAX1402 EV kit and EV system can also be used to evaluate the MAX1400 Simply order a free sample of the MAX1400CAI along with the MAX1402 EV kit MAX1402 Stand Alone EV Kit The 1402 EV kit provides a proven printed circuit board PCB layout to facilitate evaluation of the MAX1402 with user supplied software and hardware It must be interfaced to appropriate timing signals for proper operation Refer to the MAX1402 IC data sheet for timing requirements See Table 2 Jumper Functions MAX1402 EV System The MAX1402 EV system operates from a user supplied 8V to 12VDC power supply Component Lists MAX1
7. 2 Evaluation Kit Evaluation System Figure 1 MAX1402 EV Kit Schematic MAXIM Evaluate MAX1400 MAX1402 MAX1402 Evaluation Kit Evaluation System WWW MAXIM MAX1400 1 2 3 EVALUATION KIT REF REF OFFSET GAN JU8 SVIAAI VI C1 5198 R10 Rem m ANG simi m 07 5 amp Ans _ OO 42 06 JU7 C3 051 DSO OUT2 0011 GND EXTCLK Figure 2 MAX1402 EV Kit Component Placement Guide Component Side ED AM AN3 R2 Ri GD AIN2 AN JPG 1 04 REV B MADE IN USA MAKLM MAX1402 Evaluation Kit Evaluation System Evaluate MAX1400 MAX1402 Figure 3 MAX1402 EV Kit PCB Layout Component Side MAXIM Evaluate MAX1400 MAX1402 MAX1402 Evaluation Kit Evaluation System Figure 4 MAX1402 EV Kit PCB Layout Solder Side Revision History Pages changed at Rev 2 Title change all pages 1 2 3 4 10 11 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product No circuit patent licenses are implied Maxim reserves the right to change the circuitry and specifications without notice at any time 12 Maxim Integrated Products 120 San Gabriel Drive Sunnyvale CA 94086 408 737 7600 2007 Maxim Integrated Products MAXIM is a registered trademark of Maxim Integrated Products Inc
8. 402 EV System DESCRIPTION MAX1402EVKIT 1 MAX1402 EV kit 68HC16MODULE DIP 1 68HC16 uC module USBTO232 USB to COM port adapter board Denotes lead free and RoHS compliant PART Windows is a registered trademark of Microsoft Corp MAAKI Features Easy to Configure Collects Up to 8192 Samples at Full Speed Complete Evaluation System Proven PCB Layout Fully Assembled and Tested EV Kit Software Supports Windows 98 2000 XP with RS 232 COM Port EV Kit Software Supports Windows 2000 XP with USB Port Ordering Information PART TYPE RANGE MAX1402EVKIT 0 C to 70 C MAX1402EVC16 0 C to 70 C Note The MAX1402 software can only be used with the com plete evaluation system MAX 1402EVC 16 which includes the 68HC 16MODULE DIP USBTO232 and the MAX T402EVKIT INTERFACE TYPE User supplied Windows software MAX1402 EV Kit PART QTY DESCRIPTION 100pF ceramic capacitors 1206 TDK C3216C0G2J101K 0 1uF ceramic capacitors 1206 Murata GRM319R71H104K TDK C3216X7R1H104K Not installed capacitors 2 2uF 25V X7R ceramic capacitor TDK C3216X7R1E225K 2 x 20 right angle socket 1 1 Female SMA connector 0 Not installed 6 100Q 5 resistors 1206 2 2 10Q 5 resistors 1206 Not installed resistors MAX1402CAI 28 pin SSOP MAX6025AEUR SOT23 2 500V voltage reference 200ppm C max 2 4576MHz ceramic resonat
9. EVKIT ASM Source code defining the program inter face with the Maxim 68HC16 Module ROM Rev 2 0 www murata com TDK Corp 847 803 6100 847 390 4405 www component tdk com Note Indicate that you are using the MAX1402 when contacting these component suppliers 770 436 3030 Quick Start Recommended Equipment USB Port PC Connection Option Before beginning the following equipment is needed e MAX1402 EV system MAX1402 EV kit 68HC16MODULE DIP USBTO232 USB cable included e ADC power supply that generates 8VDC to 12VDC at 30 50mA e A user supplied Windows 2000 XP computer with an available USB port to connect to the USBTO232 board Note In the following sections software related items are identified by bolding Text in bold refers to items directly from the EV kit software Text in bold and underlined refers to items from the Windows 2000 XP operating system Connections and Setup The MAX1402 EV kit is fully assembled and tested Follow the steps below to verify board operation Caution Do not turn on the power supply until all connections are completed 1 Visit the Maxim website www maxim ic com to download the latest version of the USBTO232 User Guide Follow the steps in the USBTO232 User Guide Quick Start section and return to step 2 of this Quick Start section when finished 2 Make sure your 6HC16MODULE DIP module has the Rev 2 0 ROM The software will not function with the Rev 1 0
10. ROM 3 Carefully connect the boards by aligning the 40 pin header of the MAX1402 EV kit with the 40 pin con nector of the 68HC 16MODULE DIP module Gently press them together The two boards should be flush against one another 4 Connect the DC power source to the uC module at terminal block J2 located next to the ON OFF MAX1402 Evaluation Kit Evaluation System switch along the top edge of the uC module Observe the polarity marked on the board 5 Connect the USBTO232 board to the 68HC16MODULE DIP module if you have not done so already 6 The MAX1402 EV kit software should have already been downloaded and installed in the USBTO232 Quick Start INSTALL EXE UNINST INI Installs the EV kit files on your computer Database for uninstall program Removes the EV kit files from your computer This file is automatically copied to CAWINDOWS during installation UNMAXIM EXE 7 Start the MAX1402 program by opening its icon in the Start Programs menu 8 Turn on power supply and slide SW1 to the ON position on the 68HC 16MODULE DIP module Press the OK button to automatically connect and download the KIT1402 C16 file to the module 9 When the software successfully establishes com munication with the EV kit board you will see a con figuration tool and some other windows Verify that the CLKIN and reference voltage settings are cor rect Close or minimize this dialog box 10 Apply input
11. ULLPD bit is set Refer to Table 4 Guide to Register Bit Functions Communications Register COMMS Setting the FSYNC control bit inhibits the MAX1400 MAX1402 from performing its self timed measurements If FSYNC 1 when it is time to perform a measurement the MAX1400 MAX1402 simply skips that measure ment Thus power line frequency rejection is not affect ed by the FSYNC bit Setting the STDBY bit places the part in low power standby mode The serial interface and the CLK oscilla tor continue to operate The part can be restored to normal operation by clearing the STDBY bit Special Function Register SFR Setting the MDOUT bit causes the raw modulator output to be driven out the DOUT pin however the EV kit soft ware cannot read data from the MAX1402 in this mode Setting the FULLPD bit in the SFR register places the part in full power down mode The master oscillator does not run To restore normal operation click on the Reset menu item in the main display This causes the 68HC16 software to pulse the MAX1402 RESET pin Transfer Function Registers TF1 TF2 TF3 The three Transfer Function registers TF1 TF2 TF3 control how input voltage is mapped to code values The transfer function registers control a programmable gain amplifier PGA and an offset correction DAC If U B 1 the transfer function maps unipolar voltages between OV and VREF If U B O then the transfer function maps bipolar voltages between VREF
12. all three transfer func tion registers are set to the same value This calibration affects only the displayed voltage not the raw code numbers The average CALOFF and CALGAIN code values are used as the endpoints of a linear interpolation with CALOFF measuring zero volts and CALGAIN measuring VREF The linear interpolation formula is as follows VREF Code CALOFFcode Voltage 21298 CALGAINcode CALOFFcode PGAgain Sampling Tool To sample data at full speed select Sample from the main display menu make your selections and click on the Begin Sampling button Sampling rate is controlled by the Configuration tool Sample size is restricted to a power of two Sample Size controls the number of sam ples collected on each selected channel After the samples have been collected the data is automatically uploaded to the host and is graphed Once displayed the data may be saved to a file While the Sampling tool is open the other windows are locked out Close the Sampling tool by clicking the Close icon in the upper corner Register Display Tool This tool displays all of the internal registers of the MAX1400 MAX1402 Modify any bit value by checking MAXIM or unchecking its box The START bit and the zero bits in the special function register SFR cannot be modi fied The Read All Registers button causes the soft ware to read all of the MAX1400 MAX1402 s registers Not functional when the MDOUT or F
13. ency FS1 Select the data output rate FSO Select the data output rate FAST Selects SINC filter instead of SINC GS2 SCAN Enables the scanning sequences 1 Enables the CalGain channel MO Enables the CalOff channel BUFF Enables the input buffers DIFF Selects differential input pairs BOUT Enables the transducer burn out test currents IOUT Enables the OUT1 and OUT2 current sources MAX1402 only X2CLK Selects the CLKIN frequency SFR MDOUT Changes the DOUT and INT pins to provide raw modulator output FULLPD Activates full power down mode Use hardware reset to restore normal operation All other bits in SFR must be zero TF1 2 3 G2 GO Select the PGA Gain U B Selects unipolar or bipolar coding D3 DO Select the offset correction DAC code D3 sign D2 DO magnitude DATA D17 DO Raw code value DS1 Value of the 051 input pin MAX 1402 only DSO Value of the DSO input pin MAX 1402 only CID2 CIDO Channel identification tag MAXIM Evaluate MAX1400 MAX1402 v 2091 in EN v 1 5 69 IN J UU ND y aday A__1NON 5209 VAZIXI AZ zn 145440 9 N4407V9 NNIIQW LLNO 4 204 2110 145440 440179 1 050 dLNOXNW ISQ j 3 1100 Nid 3138 28192 57 MAX140
14. guration Tool The Configuration Tool controls parameters that apply to the entire EV kit Like the other windows the Configuration Tool can be activated from the Show menu of the main menu bar The CLK control should match the external ceramic resonator or crystal that sets the master clock frequency The VREF Reference Voltage control tells the software what the reference voltage is This is used to convert the raw A D output codes into the corresponding input voltage to speed user evaluation The Data Rate control determines how often the MAX1402 performs a measurement Some data rates provide 16 bit noise free resolution when used with the SINC3 filter discussed below The Filter Sync control can be used to inhibit the MAX1402 from performing its self timed measurements The Buffer Inputs checkbox enables the internal input buffers The Burnout Test Currents checkbox enables two small 0 14A current sources to provide an input stimulus When used with a transducer these current sources can be used to verify that the transducer has not failed open or short circuit At the bottom of the window there are input voltage range selection buttons These buttons configure all input channels for the same input voltage range Although the MAX1400 MAX1402 can be operated with three different input ranges at the same time the evalu ation kit software only supports a single range for all channels The digital filter on the MAX1402 can be configu
15. or Murata CSTCC2M45G53 RO PCB MAX1402 Evaluation Kit Maxim Integrated Products 1 For pricing delivery and ordering information please contact Maxim Direct at 1 888 629 4642 or visit Maxim s website at www maxim ic com 00 S1enjen3 MAX1400 MAX1402 Evaluate MAX1402 Evaluation Kit Evaluation System SUPPLIER PHONE Component Suppliers FAX WEBSITE Murata Mfg Co Ltd 770 436 1300 MAX1402 EV Kit Files Windows Application Program Files FILE DESCRIPTION MAX1402 EXE Application program that runs under Windows 98 2000 MAX1402 HLP Help file KIT1402 C16 Software loaded into 68HC16 microcon troller MAX1402 INI Program settings file Example Source Code Files FILE DESCRIPTION MAX1402 CPP Source code module for driving the MAX1402 provided for reference Includes definitions of the register names and low level access routines Compiled with Borland C 4 52 Maxim holds the copy right but allows customers to adapt the program for their own use without charge MAX1402 H Header file for MAX1402 CPP provided for reference 68HC16 Source Code Files FILE DESCRIPTION KIT1402 ASM Main source code for the KIT1402 C16 pro gram provided for reference Maxim holds the copyright but allows customers to adapt the program for their own use without charge
16. purpose signal inputs JU2 Closed Use CalGain inputs for gain calibration CALGAIN REFIN JU2 Open Use CalGain inputs as general purpose signal inputs JU3 Closed Use CalOff inputs for offset calibration CALOFF GND JU3 Open Use CalOff inputs as general purpose signal inputs JU4 Closed Use CalOff inputs for offset calibration CALOFF GND JU4 Open Use CalOff inputs as general purpose signal inputs JU5 Closed Use on board reference U2 REFIN GND JU5 Open REFIN and REFIN must be driven by an external reference Connects pin 5 to pin 7 MAX1402 pin 5 digital input DS1 pin 7 current source MAX1400 normal operation Closed Disconnects pin 5 from pin 7 JUG Open MAX1402 pin 5 digital input DS1 pin 7 current source MAX1400 insert filter between mux and A D Connects pin 6 to pin 8 JU7 Closed MAX1402 pin 6 digital input DSO pin 8 current source MAX1400 normal operation Disconnects pin 6 from pin 8 JU7 Open MAX1402 pin 6 digital input DSO pin 8 current source MAX1400 insert filter between mux and A D JU8 Closed Use on board reference U2 REFIN 2 5V JU8 Open REFIN and REFIN must be driven by an external reference Default trace on top layer of PCB Table 3 Default Jumper Settings JUMPER STATE FUNCTION JU1 Closed Use CalGain inputs for gain calibration CALGAIN REFIN
17. r rect Close or minimize this dialog box 00 S1enjen3 MAX1400 MAX1402 Evaluate MAX1402 Evaluation Kit Evaluation System 10 Apply input signals to the inputs labeled AIN1 AIN5 at the bottom edge of the MAX1402 EV kit board AIN6 is analog common Observe the readout on the screen Upgrading the 68HC16 Module The 1402 EV kit requires Rev 2 0 of the Maxim 68HC16 Module ROM Check the label on device U3 on the module if its label says Rev 1 0 contact the factory for a replacement To install the new ROM use the following procedure Use antistatic handling precautions To reduce the risk of ESD damage gather all required materials and per form the installation at one sitting 1 Slide the ON OFF switch to the OFF position 2 Using a flat blade screwdriver gently pry the REV 1 0 ROM out of its socket 3 Remove the REV 2 0 ROM from its antistatic pack aging 4 Align the REV 2 0 ROM in the U3 socket pins Observe correct polarity the notch at the top of the ROM Verify that the pins are lined up with the socket and gently press the ROM into place Proceed to the regular Quick Start instructions Detailed Description of Software The MAX1402 digitizes up to seven inputs The various program functions are grouped into windows which are accessible from the Show menu on the main menu bar Main Display The main display shows the calculated input voltage and raw A
18. red for SINC operation which affects the filter cutoff frequency SINC means SIN X X and SINC means SIN X X 3 The SING filter is required for 16 bit accu racy The SINC filter provides faster settling time with less accuracy Alternatively the raw modulator output can be driven out the DOUT pin however the EV kit software cannot read data from the MAX1402 in this mode MAX1402 Evaluation Kit Evaluation System Calibration Tool The MAX1402 EV kit software can average the mea surements from the calibration channels and use the measured values to correct the voltage displays The calibration algorithm assumes that the CALOFF inputs are externally connected together and that the CALGAIN inputs are externally connected to the refer ence voltage VREF View the calibration tool by selecting it from the Show menu The software automatically disables calibration if either of the calibration channels reports a code of O or 262143 This is to prevent erroneous calibration when using a transfer function that does not include both OV and VREF When Use CALOFF and CALGAIN for Calibration is checked the software averages the raw A D codes for the CALOFF and CALGAIN channels The average is calculated as a weighted sum of the new data and the old average value The Slower Faster slide bar controls the weight of the new data vs the weight of the old average The EV kit software assumes that
19. s the RC filters settling time may increase the acquisition time required for full accuracy Evaluating the MAX1400 The MAX1400 can be evaluated by shorting across jumpers JU6 and JU7 The MAX1400 is exactly like the MAX1402 except that the function of pins 5 6 7 and 8 is changed Instead of the OUT1 OUT2 outputs and DS0 DS1 inputs these pins are used to provide access to the analog signal between the multiplexer and the A D converter Tables 2 and 3 list the jumper functions and default settings Refer to the MAX1400 data sheet for detailed information Measuring Supply Current Supply current can be estimated by measuring the volt age across a series resistor On the EV kit board the MAX1402 draws all of its analog and digital power through R8 which is 10Q In addition all analog supply current flows through R7 which is also 10Q Troubleshooting Problem unacceptable amounts of noise in the signal Collect a sample of 1024 measurements at a 60Hz data rate Observe whether the problem is caused by 60Hz noise Any AC powered equipment connected to the analog signal ground can inject noise Try replacing AC pow ered DVMs with battery powered DVMs MAXIM MAX1402 Evaluation Kit Evaluation System Table 2 Jumper Functions JUMPER STATE FUNCTION JU1 Closed Use CalGain inputs for gain calibration CALGAIN REFIN JU1 Open Use CalGain inputs as general
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