UM1542 User Manual - STMicroelectronics
Contents
1. 8 15 QNO 18 QNO z 1HOIMS L 3000 NO LLNSHSNd L ao 2 ao iz Ems t i HOLIMS l one NO LLNG da NO LLNG AWIL HOLIMS NOOG z z L L gaT N33u5 gt gt WHO 81S 29 sas z 8W1S QNO noose 9 A 8WLS 37209 ranil T 2 L7 p seu Q3 aas 24 WHO 096 Bs taal T T gt 2 L7 21 veu 9a aazznd pO muoos C 15380 M zani i z SEM Peas WHO 096 AA Nid 2 4 Nid 1 gt Nid L O gt raat z T p va L WHO 9 WHO MOST Nid SAZI e c 92 ZN d WHO 06 WHO 001 SP LEN ang WHO 06 57 WHO 001 i bed rirz T z z 7 WHO Lb 528 622 z z u YOLSINWA 9AS snooze Ps za 9 30 SNIVW 99 js L 3914 c o N2. 12 2 3 3 Control side and communication side power supplies 12 2 3 4 STM32F103 microcontroller 12 2 4 Graphic user interface GUI 12 3 Using the STEVAL IHT001V2 thermostat kit 14 3 1 Thermostat 510 5 14 3 2 Loads 14 3 3 Measure 15 3 4 CONTO CP CETTE 15 3 57 Getting started seas diese tipa epa ERU bare Bem ee 17 3 5 1 Jumper configuration for standalone or PC driven modes 17 3 5 2 Getting started 18 3 5 3 Operating modes 19 3 5 4 Instructions for the GUI software 20 3 6 GUI windows description 20 3 6 1 Temperature control tab 20 3 6 2 Timing control tab 0 21 3 6 3 Force debug RR REPERI NER E ORE RR AR E 22 3 6 4 Parameter measurements 22 2 43 Doc ID 023172 Rev 1 ky UM1542 Contents 3 6 5 Saving data Rec RE ee eed Bk 23 4 CONCIUSION MMC rr 24 AppendixA Thermal sensor linearization 25 Appendix 5
3. nmn 27 Appendix 31 Appendix D Bill 32 Appendix Procedure to apply IEC 61000 4 4 burst 1 51 36 Appendix STM8 program debugging 38 Appendix PC interface parameters 40 Appendix Capacitor value according to country 41 REVISION DISIOFV eee 42 Doc ID 023172 Rev 1 3 43 List of figures UM1542 List of figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 4 43 STEVAL IHTOO1V2 board ee hn 1 Board P Em 6 Hysteresis erus Ea egere qn no s 9 Defrost contol uos E esee RR un E 11 Placement of test lille rn 15 Timing definition for gate current 5 16 GUI temperature control tab 1 2 e 21 GUI timing control window 21 GUI debug mode frame 22 Linear voltage in function of the NTC resistor for a 5 V power supply
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5. dd 5 1 4 ND in x 8 z zn ASSN ADVLIOA 4 n AE 99 s asn HOLO3NNOO SN I03NNOOSIG ES AM12249v1 29 43 Doc ID 023172 Rev 1 Schematics UM1542 Figure 14 Additional pads schematic VCC STM8 o VCC STM8 R44 R45 DNF DNF S o POTENTIOMETER ADDITIONAL PUSH BUTTON A m a DNF SW5 C35 DNF lt DNF N GND STM8 TM D11 R48 2 4 1 2 1 Additional LED1 v DNF DNF GND STM8 D12 R50 2 2 M 1 2 1 Additional LED2 DNF L DNF SOME AM12250v1 30 43 Doc ID 023172 Rev 1 UM1542 Additional pads Appendix Additional pads Additional pads were added on the board to allow the user to customize his own board for example to replace the two push buttons for temperature order setting with a potentiometer add LEDs for further temperature orders etc Functionality of additional components is not implemented These pads are shown in Figure 14 and 15 and include e OneLED replacing the TEMP push button remove 0 Q resistor R19 fit LED D11 and resistor R48 e OneLED replacing the buzzer remove 0 resistor R9 and fit LED 012 and resistor R50 e One more push button replacing LED2 remove R33 fit R22 R45 C35 and push button SW5 e One potentiometer replacing the TEMP push button remove 0 resistor R20 fit R21 C34
6. 26 Control side 2 27 Control side schematic 8 0 28 Interface side rn 29 Additional pads schematic 0 00 30 Placement of additional 31 Ix 36 General graph of a fast 1 5 37 Doc ID 023172 Rev 1 ky UM1542 List of tables List of tables Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table 9 Table 10 ACS vs 11 List oftest oad aa alfa sled eee eS ee 15 Allowable ranges for gate current 5 16 Jumper default configuration in standalone or PC driven operating mode 17 Operating mode selector 18 EUR ME 32 Jumper configuration in programming and debugging modes 38 PC interface lt 5 40 C29 capacitor value according to the 41 Document revision history 42 Doc ID 023172 Rev 1 5 43 Kit introduction UM1542 1 1 1 2 Kit intro
7. T 19 20189 19201807 orsusov ved D SNIVW 99 jeu MZ L WHO p 1 L L L 21 zt zi 21 N 1 THOM Nv 1809280 NH wossseaioo tdl 841 SdL Err 841 141 Sd vir AM12247v1 27 43 Doc ID 023172 Rev 1 UM1542 Schematics Control side schematic STM8 Figure 12 5 MS anis 510 1uven 0229 50 18588 619 9 10d IMS l 81 XL 2 0 saa sad 13538 eis 8MS z l SIS 3400 8115 99 Nid saz gt gt QNO 5 2 81 8WLS 91S 36015815 WHO 0 p YOO is 2 Ju 089 z 1 gt 5 D ia 1 caa SH SH SH vod or 7 Nid Ls usaq SH sod 8 _ 5 7 NOLLN HSNd dWAL Nid Nv3 SH 904 WHOO 194 MS 006 204 warg eui wims LOO SUN 13838 8 15 1 WIMS SH Lad easi D o7 NIMS SIS Xe i er 01 NIV SH 20 _ XL L1svn sad saa SH vad 7 937708 3 1 uaiawouNaiod gt z WHOO 2831 jeuonippy AM12248v1 Doc ID 023172 Rev 1 28 43
8. UM1542 J User manual Cold thermostat kit based on AC switches and the STM8SOOSF3 Introduction The STEVAL IHT001V2 thermostat kit Figure 1 provides a robust and low cost solution from STMicroelectronics using a microcontroller and AC switches to control a refrigerator a freezer or a fridge freezer combination The firmware embeds three different thermostat control versions basic just for compressor and light control defrost with defrost resistor control added and air circulation with fan control added This allows a wide section of the cold appliances market to be addressed The STEVAL IHTOO 1 V2 board controls a single phase induction motor and a light bulb and optionally a defrost resistor and a fan operating on 220 240 V RMS 50 60 Hz mains voltage The thermostat kit is operational with 100 120 V RMS 50 60 Hz but a supply capacitor must be chosen for a 30 mA output DC current see Appendix H The board can operate over an ambient temperature range 0 to 60 C The exact maximum temperature depends on the power of the loads Section 3 2 Figure 1 STEVAL IHT001V2 board AM12237v1 For demonstration and application development purposes a graphical user interface GUI has been developed The PC and STM8 microcontroller the MCU performing thermostat regulation are connected through a USB bus Since the STM8 MCU is a low cost MCU not embedding a USB peripheral a supplementary STM32 MCU has been
9. 2 3 3 2 3 4 2 4 12 43 STM8S003 microcontroller The MCU used in the thermostat kit is the STM8S003F3P6 belonging to the STM8S003 MCU family It embeds a large number of features at minimum cost This part number is used in order to minimize the number of pins This causes some pins to be shared for different function recovery LED3 SWIM_line LED4 USART_CTS and LED5 USART_TX Figure 12 The functions shared are functions dedicated to communication i e no pin sharing in standalone mode In order to further reduce costs the internal oscillator has been used in order to generate the clock Control side and communication side power supplies A capacitive power supply is used for the control side of the board A 1 uF capacitor C29 has been chosen to supply the board i e the control side of the board with 25 mA which is the maximum average current sunk by the control board 230 V 50 Hz line RMS voltage For more information about the design of the capacitive power supply please refer to the application note AN1476 In order to reduce the surge current an R25 resistor is used in series with the C29 capacitor Even if the power dissipation of this resistor is limited to W for a 30 mA output DC average current for R25 47 Q and 230 V line RMS voltage a 2 W resistor has to be used on the board to sustain the inrush current One particularity of STEVAL ITHOO1V2 board power supply is that it is negative Indeed the Vdd
10. Schematics UM1542 Interface side schematic Figure 13 Z 2 e _ Noo AMS z a 13535 ZEWIS ezo 9 vr T NOMS 5 OIQMS SNIW 99 ESN er 09 YOLOANNOO MS i LL 13538 8Wis m dui _ deor 3900 J019euuc9 WINS zuo x z z z z WIMS V zr 9 99 S 90 90 _ 9001426005 quj 306 mo 3122 225 80 10 so 388 VSS vada z T 01008 J WWE vai DM OON Z zisa 1S N 7 Ju 25 2 74 S gr 884 Ha ESRRGSSH SER HB 88 493NNO9SIG St vas HOMS 8 105 02 989 daagsn sia Liavsn DANS 20 vans ozisad waasnisio Liuvsn uivd ASYNI PSd XUY LLYVSN OLWd ad 85 cons Ot oair ad xi Liuvsn evd HE ec o Liuvsn evd wa amp sn 1008 288 6 02
11. Using the STEVAL IHT001V2 thermostat kit UM1542 3 3 1 3 2 14 43 Using the STEVAL IHT001V2 thermostat kit Thermostat versions The target market of the STEVAL IHT001V2 kit is represented by low end to high end cold appliances thus addressing a wide range of the COLD market In particular the MCU firmware is configurable to work in e Basic version compressor and light bulb control e Defrost version compressor light bulb and defrost resistor control e Aircirculation version default compressor light bulb defrost resistor and fan control When the target thermostat is selected using the GUI the gates associated with non operating loads are no longer controlled and remain uncontrolled even if the GUI is disconnected To allow again fan or defrost heater control the user has to re program the STM8 MCU using the GUI Loads power There is no heatsink mounted on the package of ACST610 8FP devices In this case the maximum permanent allowed current is 1 5 A RMS for an ambient temperature lower than 40 C which is usually the highest operating temperature as the thermostat is either inside the fridge or outside on top so at room temperature If the ACST610 8FP must sink a higher current or works at a higher temperature a heatsink can be added If its case temperature is kept below 92 C these devices can control a 6 A RMS current as shown in Fig 3 of the ACST6 datasheet Refer to AN533 for further information on
12. window Doc ID 023172 Rev 1 ky UM1542 Using the STEVAL IHT001V2 thermostat kit 3 6 5 Saving data The user can choose to update the STM8 MCU firmware with the timing and temperature parameters used A dedicated button allows in fact uploading of these parameters Otherwise the STM8 MCU is not updated and default parameters is used for the next switch on of the thermostat The current parameters can also be saved using the GUI A tfs file is available for uploading Please note that in this case the MCU is not programmed with the current values ky Doc ID 023172 Rev 1 23 43 Conclusion UM1542 4 24 43 Conclusion This document helps cold appliance designers to use STEVAL IHT001V2 thermostat kit The tool can be used to Check the immunity of this ST solution in standalone mode Easily check the appliance efficiency gains by reduction of the hysteresis threshold Define better management of the defrost cycles to improve the overall efficiency Adapt the software using the GUI and the hardware for other dedicated designs control of different loads conduction time of the ACS adapt gate pulse widths and synchronization implement potentiometer control implement light dimming etc Doc ID 023172 Rev 1 ky UM1542 Thermal sensor linearization Appendix Thermal sensor linearization An NTC thermistor is a resistor whose value decreases when its temperature increases The thermal law is expon
13. 023172 Rev 1 39 43 PC interface parameters description UM1542 Appendix G PC interface parameters description Output in the table below is defined as the information sent by the STM8S MCU to the STM32 and input is the contrary Table 8 PC interface parameters 40 43 Doc ID 023172 Rev 1 Parameter Software type Unit Facto ry Allowable Setting step setting range Temperature hysteresis Input output 4 0 5 to 20 0 1 Evaporator temperature Output N A 40 to 40 Evaporator temperature order 1 Input output 5 40 to 10 0 5 Evaporator temperature order 2 Input output 12 40 to 10 0 5 Evaporator temperature order 3 Input output 20 40 to 10 0 5 Evaporator temperature order 4 Input output 28 40 to 10 0 5 Evaporator temperature order 5 Input output C 36 40 to 10 0 5 Compressor phase shift Input output ms 0 5 0 1 to5 0 1 t t pul idth Input output ms 3 0 1 to 4 0 1 for compressor control t t pul idth Gate curren pulse Input output ms 5 01105 0 1 for bulb control t t pul idth ele MEM Input output ms 1 0 1 to 3 0 1 for defrost resistor control Gate current pulse width for fan Input output ms 2 0 1 to 3 0 1 Fan phase shift Input output ms 0 5 0 1105 0 1 Defrost activation delay Input output HOU ang 8 1 to 99 10 minutes Defrost duration input output Minutes and 20 1 10 60 10 seconds ZVS
14. D2 Zener5V 60 5 W D3 Rectifier 1N4148 D4 GREEN_LEDs D5 GREEN_LEDs D6 RED_LED D7 GREEN_LEDs D8 GREEN_LEDs D9 GREEN_LEDs D10 Rectifier 1N4148 D11 D12 Additional LEDs Do not fit F1 FUSE Fuse 8 5 x 8 5 mm 6 3 A 250 V N A FUSEHOLDER J1 TES 1 0511 DC DC converter J2 SWIM Connector 4w single row vert male smt connector J3 SWD Connector 10w dual body SMT micro terminal strip J4 J5 J8 J18 CONS3 Stripline male 3ways J14 CONS3 Terminal Block nb contacts 3 J10 J11 J12 J13 Connector CON2 Terminal Block nb contacts 2 J15 J16 Connector CON2 Terminal Block nb contacts 2 PZ1 Buzzer BUZZER 4 0 kHz 1 20 V 80DB Q1 ACST6 Motor switch Q2 ACST110 Defrost resistor switch Q3 ACS102 6TA Fan light bulb switch Q4 ACS102 6TA Fan light bulb switch R1 330 Q R2 1 R3 1 MQ R4 10 R5 10 R6 0 R7 10 Ky Doc ID 023172 Rev 1 33 43 Bill of materials UM1542 Table 6 BOM continued Name Designation Comment R8 1 5 kQ R12 0 R13 0 R17 0 R18 10 R19 0 R20 0 R21 0 Do not fit R22 0 Do not fit R23 33 Q metallic 1 2 W 1 R24 56 Q R25 47 metallic 2 W 1 R26 150 kQ metallic 1 R27 150 kQ metallic 1 R28 100 25 R29 100 9 5 R30 90 25 R31 90 25 R32 350 25 R33 350 25 R34 350 25 R35 350 25 R36 500 R37 350 25 R38 30 0 R39 10 kQ R40 10 R41 10 kQ R42
15. added as a bridge between the PC and STM8 MCU only in order to allow communication through the GUI The GUI is not only used to configure the thermostat basic defrost air circulation but also allows control parameters to be set and parameters measured during tests to be obtained Section 3 6 This document provides users with all the information needed to get started with and operate the STEVAL IHT001V2 thermostat kit For detailed information on how to access the MCU in order to modify measure parameters please refer to the Help menu of the GUI software September 2012 Doc ID 023172 Rev 1 1 43 www st com Contents UM1542 Contents 1 Kit introduction ee 6 1 1 Package contents 6 1 2 Board presentation 6 2 Functional description 8 2 1 Performance 8 2 2 Ensured 1UunCHONS sies Rc RR REOR 8 2 2 1 Temperature 8 2 2 2 Compressor control 10 2 2 3 Light bulb and buzzer 10 2 2 4 Defrost resistor and fan control 10 2 3 11 2 3 1 ACS ACST devices 11 2 3 2 STM8S003 microcontroller
16. control firmware loaded in the STEVAL IHTOO 1 V2 board in not optimized for the IEC 61000 4 4 burst test separate firmware which implements a smart reset procedure without GUI functions was used to improve the immunity of the board This firmware is available on the CD ROM included with the STEVAL IHT001 V2 Doc ID 023172 Rev 1 37 43 STM8 program debugging UM1542 Appendix F STM8 program debugging A SWIM connector is present on the board to allow programming debugging operations If an expert user wants to reprogram the STM8 they must follow these procedures 1 2 3 4 5 Programming mode procedure Unplug the board from the mains voltage Ensure that the jumpers and switches are set as indicated in Table 7 programming mode in order to provide the MCU with 5 V power supply from USB Connect the programmer to the SWIM connector J2 in Figure 5 Plug in the mini USB Continue with usual programming procedures Only if an insulated AC source is used to supply the mains voltage can the board be used in debug mode i e both the communication side and the control side are supplied by the USB but the ACS are supplied by the mains voltage and the board is fully working 1 2 3 4 5 6 Debugging mode procedure Plug an insulated AC source to supply STEVAL IHT001V2 board J14 header Connect the loads on the thermostat board see Figure 2 Ensure that the jumpers and switches are set as indicated
17. in Table 7 debugging mode in order to provide the MCU with 5 V power supply from USB Plug in the mini USB Power on the insulated AC source Continue with usual debugging procedures This operating mode is allowed only for expert users Table 7 Warning Please take careful note of the jumper configuration given in Table 7 before powering up the board whatever the mode of operation Incorrect jumper configuration with a non insulated power source may result in damage to the PC Jumper configuration in programming and debugging modes Jumper J4 Programming mode 123 n Debugging mode 123 Vec_mains Description 1 2 3 Vcc use J5 123 123 GND mams 123 GND use GND 38 43 Doc ID 023172 Rev 1 UM1542 STM8 program debugging Table 7 Jumper configuration in programming and debugging modes Jumper Programming mode Debugging mode Description PD1 SWIM pin 1 2 3 1 2 3 E a SWIMline 123 123 123 NO GND 1 This debugging mode refers to the possibility to potentially debug a new different firmware uploaded in the STM8 microcontroller Do not mistake with Debug mode described in Section 3 6 3 since it means operating mode offered by the PC GUI software nothing to do with the debugging of firmware 2 Only if an insulated power source is used Doc ID
18. in standalone mode or VL L M H VH in PC GUI driven mode Figure 7 turn on according to the temperature set point ky Doc ID 023172 Rev 1 9 43 Functional description UM1542 2 2 2 2 2 3 2 2 4 10 43 Compressor control The ACST610 8FP device referred to as Q1 in Appendix B is used to turn on and off the compressor according to the evaporator temperature sensed through the NTC resistor Enough room around this AC switch has been left available to add a heatsink if needed Light bulb and buzzer control The slider SW2 on the thermostat board has been placed on the board in order to simulate the fridge freezer door A light bulb is switched on or off according to the position of the door switch open or closed respectively The embedded switch may be replaced by an external switch using connector J15 in which case switch SW2 must be set in the Open position If the fridge door or the door switch remains in the open position more than one minute the buzzer PZ1 sounds and the LEDs D4 D5 D7 D8 D9 flashes The buzzer can be stopped by pressing the Temp or Temp button once the LEDs keeps on flashing while the door is in the open position In the PC GUI driven mode the buzzer can be stopped with the GUI software refer to the Help menu of the GUI When the door is open the temperature order can only be changed using the GUI software The light bulb is driven by the ACS102 6TA Q4 on the thermostat boa
19. more information e Slide bars to change the MCU parameters refer to Figure 7 and 8 Temperature hysteresis Evaporator temperature set point for each thermostat order Gate current pulse widths and delays Time before defrost activation and defrost duration ZVS delay synchronization MCU commands with the mains voltage e Virtual knob to set the evaporator temperature level e Virtual switch debug active to force the loads to on or off states compressor light defrost fan for easier board validation e Measurement and storage of several parameters during operation duty cycle and running period of the compressor evaporator temperature evolution mains frequency and load status The most recently modified variables with the GUI can be stored for operation in standby mode It can be noted from Figure 2 that the part of the PCB dedicated to the PC interface is clearly separated from that part of PCB dedicated to thermostat control in order to easily visualize the component count dedicated only to the thermostat application By means of opto couplers safety insulation is implemented between the board and the PC to allow communication with the GUI when the board is plugged into the line voltage These opto couplers U3 U4 and U5 are supplied from the USB connector CN1 and the DC DC converter J1 in order to not sink current from the capacitive power supply Appendix B Doc ID 023172 Rev 1 13 43
20. temperature setting is allowed except by using the GUI software in the PC GUI driven mode A closed position is required for temperature setting using the Temp Temp push buttons Connect the loads on the thermostat board see Figure 2 Compressor to J10 connector Defrost resistor to 411 connector Fanto J12 connector Indoor light bulb to J13 connector Ensure that jumpers and switches are set as indicated in Table 4 and 5 Plug the mains wire into MAINS connector Plug the mains wire into the mains voltage After a few seconds during which the MCU setup operations and frequency measurement operation take place The on off red LED turns on D7 LED turns on indicating that medium temperature is set The compressor and fan switch on if the sensed temperature is above the temperature order should be the case if the NTC is at ambient temperature The light bulb is switched on if the DOOR switch is in an open position in which case the fan is switched off The LED D8 turns on for about a half second during the setup phase then it is switched off Doc ID 023172 Rev 1 437 UM1542 Using the STEVAL IHT001V2 thermostat kit PC GUI driven mode 1 Repeat steps 1 to of standalone mode 2 Ensure that the jumpers and switches are set as indicated in Table 4 and 5 PC driven mode 3 Plug the USB connector into the PC 4 Plug the mains wire into t
21. terminal is connected to neutral which means that the GND voltage is 5 V below neutral This type of connection is mandatory to drive ACS devices Indeed ACSs can only be triggered by a negative current i e sourced from the gate The communication side with the STM32F103 microcontroller is only supplied by the PC by means of the USB connector through the voltage regulator U2 see Appendix B STM32F103 microcontroller As for the connection between the PC and the STM8 microcontroller USB bus is used Since the low cost MCU dedicated to thermostat control does not embed a USB interface a second MCU has been used to work as a gateway between the PC and the STM8 This MCU is STM32F103C6 belonging to the STM32F 103 family It is only used for demonstrative purposes i e for communication in PC GUI driven mode Graphic user interface GUI The graphical user interface GUI was developed in order to allow the user to set some control parameters to configure the thermostat for the different versions basic defrost air circulation and to acquire variables during tests The user can also choose to program the STM8 microcontroller with new control parameters The connection with the PC using the USB interface is ensured by the STM32 MCU embedding a USB peripheral Doc ID 023172 Rev 1 ky UM1542 Functional description The GUI provides the following features refer to the Help menu of the GUI software for
22. the GUI software The conduction starts just before the conduction cycle of the compressor in order to reduce power consumption Doc ID 023172 Rev 1 ky UM1542 Functional description Figure 4 Defrost control Evaporator temperature evolution Thich tim Tiow tim Compressor t DEFROST t Sum of Compressor ON times gt DEFROST ACTIVATION DELAY After DEFROST DURATION At gt DEFROST ENABLED gt DEFROST TURN OFF 1 Compressor turn on Evaporator ne gt THIGH lim c DEFROST TURN ON AM12240v1 Fan control is only available in the air circulation fridge version The fan is driven by the ACS102 6T Q3 on the thermostat board Appendix B The fan is on at the same time the compressor is on except if the door is open in that case the fan is turned off while the compressor is still running 2 3 Hardware features 2 3 1 ACS and ACST devices The STEVAL IHT001V2 board embeds an ACST610 8FP an ACS110 7SN and two ACS102 6T Table 1 summarizes the main differences between ACS and ACST and traditional TRIACs Table 1 ACS vs TRIAC devices Device Z0107 ACS102 Z0109 ACS110 BTAO6 SW ACST610 Igt mA 5 5 10 10 10 10 Overvoltage No Yes No Yes No Yes protection dV dt 20 V us 300 V us 50 V us 500 V us 40 V us 500 V us dl dt at turn on 20 A us 50 A us 20 A us 50 A us 50 A us 100 A us Doc ID 023172 Rev 1 11 43 Functional description UM1542 2 3 2
23. thermal management Refer also to AN1354 for more information on single phase compressor control The ACS102 6T in the TO 92 package can withstand a 0 2 A RMS permanent current up to an ambient temperature of 100 C The ACS102 6T can drive the common light bulbs or fan found in the fridge or freezer without any problem Indeed a 25 W bulb always sinks a current lower than 150 mA and ACS102 6T can drive a maximum power fan of 40 W The ACS110 can drive a maximum 160 W defrost resistor for an ambient temperature lower than 40 C Indeed the ACS110 cooling PCB pad of the thermostat kit demonstration board is cut down to the SOT223 tab size As shown in fig 2 2 of the ACS110 7SN datasheet it can withstand a 1 A RMS permanent current up to an ambient temperature of 60 C with a copper surface of 5 cm under the SOT223 tab and can then drive a 200 W defrost resistor Doc ID 023172 Rev 1 437 UM1542 Using the STEVAL IHT001V2 thermostat kit 3 3 Measure points Figure 5 shows where the test points are placed on the board while Table 2 gives the definitions of the measurement points Figure 5 Placement of test points ZVS GND VDD Compressor Light bulb Defrost Fan AM12241v1 Table 2 List of test points Name Description L Line N Neutral VDD 5 V non insulated power supply also connected to ACS ACST cathodes GND GND non insulated power supply ZVS Zero volta
24. 0 to 10 C Temperature regulation is achieved by hysteresis control see Figure 3 Doc ID 023172 Rev 1 437 UM1542 Functional description Figure 3 Hysteresis law Compressor status ON Hysteresis OFF TLow THIGH im Evaporator temperature Evaporator temperature ORDER AM12239v1 Five temperature set points have been implemented 1 Very low 2 Low 3 Medium 4 High 5 Very high For each temperature set point an evaporator temperature a hysteresis thus an upper limit and a lower limit are defined and Ti ow are respectively the upper and the lower limits of the hysteresis and are defined as Equation 1 Hysteresis us EvaporatorTemperature Equation 2 Hysteresis EvaporatorTemperature a The compressor is switched on if the sensed temperature is above THIGH and switched off when this temperature becomes lower than ow jim When the door is open Section 2 2 3 temperature control is not allowed i e any action on TEMP and TEMP has no effect The temperature set point or temperature order can be set at one of the five levels by means of the two push buttons PB1 and PB2 temperature setting push buttons in standalone mode see Figure 2 or by means of the GUI in PC driven mode Section 3 6 while the hysteresis value can only be changed using the GUI Five LEDs D4 D5 D6 D8 D9 temperature setting LEDs Figure 2
25. 3 43
26. 300 25 R43 300 25 R44 Potentiometer Do not fit R45 R48 R50 Do not fit R51 R52 R53 56 Q R49 30 5 RV1 MOV 34 43 Doc ID 023172 Rev 1 UM1542 Bill of materials Table 6 BOM continued Name Designation Comment SW1 Push button Reset 5 2 2 Pos slider Door Switch SW3 Push button T PUSHBUTTON SW4 Push button T PUSHBUTTON SW5 Additional push button Do not fit SW8 Slider PC GUI standalone selector TP3 TP4 TP5 TP6 TP7 TP8 TP9 TP10 Testing points Nylon corner spacer screw TP11 U1 STM32F103C6 U2 LD1117 SO U3 U4 U5 ACPL 072L U6 STM8S003F3 TSSOP20 U7 USBUFO2W6 Y1 8 MHz 8 MHz crystal N A Doc ID 023172 Rev 1 35 43 Procedure to apply IEC 61000 4 4 burst test UM1542 Appendix Procedure to apply IEC 61000 4 4 burst test Fast transient voltage tests have been performed according to the EN 61000 4 4 standard on the STEVAL IHT001V2 board in standalone mode During the tests loads were replaced by incandescent lamps in order to visually detect any load spurious turn on Arrangements have been taken in order to implement tests in agreement with the EN61000 4 4 standard Equipment under test was placed on a ground reference plane insulated from it by an insulating support 0 1 m 0 01 m thick The NTC 1 m long see Figure 16 and all the cables to the loads were placed on the same insulating sup
27. ACST610 8FP an ACS110 7SN and two ACS102 6TA which control a compressor a defrost resistor a light bulb and a fan respectively One red ON OFF LED This LED turns ON when the board is powered Five green LEDs for temperature set point visualization Two push buttons to increase decrease the temperature set point Temp and Temp A buzzer to warn the user if the appliance door has been open for long time Connectors for the NTC and door switch One switch to simulate the door switch e Interface side STM32F103 microcontroller to implement USB interface Opto insulators to implement safety insulation between the board and the computer to allow communication with the GUI when the board is plugged into the line voltage DC DC converter to supply the opto couplers from the USB supply Switches for standalone PC driven configuration see Section 3 5 1 Mini USB connector The control side is independent from the interface side i e control is ensured by powering on the control side only in this case no GUI interfacing is allowed of course Warning Safety insulation is implemented between the board and the computer to allow GUI communication when the board is plugged into the line voltage but the control side of the board is not electrically isolated from the AC input The STM8 microcontroller is directly linked to the mains voltage There is no insulation between the accessible parts and the high voltage The STEVAL IHT001V2 kit must
28. GHT UNLESS EXPRESSLY APPROVED IN WRITING BY TWO AUTHORIZED ST REPRESENTATIVES ST PRODUCTS ARE NOT RECOMMENDED AUTHORIZED OR WARRANTED FOR USE IN MILITARY AIR CRAFT SPACE LIFE SAVING OR LIFE SUSTAINING APPLICATIONS NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY DEATH OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ST PRODUCTS WHICH ARE NOT SPECIFIED AS AUTOMOTIVE GRADE MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER S OWN RISK Resale of ST products with provisions different from the statements and or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever any liability of ST ST and the ST logo are trademarks or registered trademarks of ST in various countries Information in this document supersedes and replaces all information previously supplied The ST logo is a registered trademark of STMicroelectronics All other names are the property of their respective owners 2012 STMicroelectronics All rights reserved STMicroelectronics group of companies Australia Belgium Brazil Canada China Czech Republic Finland France Germany Hong Kong India Israel Italy Japan Malaysia Malta Morocco Philippines Singapore Spain Sweden Switzerland United Kingdom United States of America www st com ky Doc ID 023172 Rev 1 4
29. and potentiometer R44 Figure 15 Placement of additional pads Additional pads AM12251v1 ky Doc ID 023172 Rev 1 31 43 Bill of materials UM1542 Appendix Bill of materials Table 6 BOM Name Designation Comment Surface mount USB_mini B C1 Capacitor 10 uF 2096 C2 Capacitor 10 nF 2096 C4 Capacitor 4 7 nF 20 C5 Capacitor 22 pF 20 C6 Capacitor 22 pF 20 C7 Capacitor 100 nF 2096 C8 Capacitor 10 nF 2096 C11 Capacitor 100 nF C12 Capacitor 100 nF C13 Capacitor 100 nF C14 Capacitor 100 nF C19 Capacitor 100 nF C20 Capacitor 680 nF 20 C21 Capacitor 1 uF 20 C22 Capacitor 100 nF C23 Capacitor 100 nF 16 V 20 C24 1 nF 16 V 20 C25 1 nF 16 V 20 C26 Capacitor 100 nF X2 400VCC 220VCA C27 Capacitor 2200 uF16 V 20 C28 Capacitor 10 nF 400VCC 220VCA 10 C29 Capacitor 1 uF X2 400VCC 220VCA 10 C30 Capacitor 1 nF 50 V C31 10 nF 50 V 20 C32 10 nF 50 V 20 C33 10 nF 50 V 20 C34 Do not fit C35 Do not fit C36 1 nF 16 V 20 C37 1 nF 16 V 20 C38 2 2 nF 32 43 Doc ID 023172 Rev 1 UM1542 Bill of materials Table 6 BOM continued Name Designation Comment C39 Capacitor 10 nF 400 VCC 220 VCA 10 C40 Capacitor 10 nF 400 VCC 220 VCA 10 C41 Capacitor 10 nF 400 VCC 220 VCA 10 D1 LED
30. be used with care and only by persons qualified for working with electricity at mains voltage levels Any measurement equipment must be isolated from the mains before powering the board To use an oscilloscope with the kit it is safer to isolate it from the AC line This prevents a shock from occurring as a result of touching any single point in the circuit but does not prevent shocks when touching two or more points in the circuit Doc ID 023172 Rev 1 7 43 Functional description UM1542 2 2 1 2 2 2 2 1 8 43 Functional description Performance This board has been developed to fulfill the following requirements e Suitability for a wide range of cold appliances this thermostat board can control the loads traditionally used in low medium and high end cold appliances compressor light defrost resistor if present fan if present e loads are switched on at mains zero voltage and operate in full cycle conduction mode This allows suppressing any EMI conduction noise e Electromagnetic compatibility the board is able to withstand bursts up to 3 1 kV during 61000 4 4 standard tests without any operational problem Surge tests have also been performed IEC61000 4 5 standard with bursts of 2 kV applied without any damage to the semiconductors e Compliance to safety standards a 2 mm gap is ensured between all high voltage and low voltage parts to obtain a functional level of isolation The ther
31. delay Input output Hs 50 5 to 255 5 Line frequency Output Hz N A 50 60 UM1542 Capacitor value according to country Appendix H Capacitor value according to country Table 9 indicates the capacitor value for 30 mA average current for typical application case nominal capacitor value nominal RMS line voltage versus different AC mains and frequency values used in different countries Moreover the typical and minimal nominal capacitor value 10 minimum RMS line voltage output DC current capabilities are included for information Table 9 C29 capacitor value according to the country Dutput Do current Min output DC current Typical RMS Minimum C29 for typical bii Country Frequency icis capabilities for worst voltage RMS voltage capacitor application Sun application case conditions Japan 100 V 90 V 50 60 Hz 2 2 uF 31 1 mA 25 2 mA USA 120 V 100 60 Hz 1 5 UF 30 5 mA 22 9 mA Brazil 120Vto 102 V to Mexico 240 V 204 V 50 60 Hz 2 2 UF 37 3 mA 28 5 mA Europe China 220 V to 187 Vto Korea 240 V 204 V 50 60 Hz 1 pF 31 1 mA 23 8 mA Australia ky Doc ID 023172 Rev 1 41 43 Revision history UM1542 Revision history 42 43 Table 10 Document revision history Date 10 Sep 2012 Revision 1 Initial release Changes Doc ID 023172 Rev 1 UM1542 Please Read Carefully Information in this document is provided solely in con
32. duction Package contents The following items are supplied in this package e A thermostat board ref STEVAL IHT001V2 e 2020 5k NTC from EPCOS ref M2020 5k A20 e ACD ROM including product presentations and datasheets user manual this document application notes firmware and the GUI software Board presentation The STEVAL IHT001V2 thermostat kit board is ideally separated in two parts as shown in Figure 2 All devices dedicated to thermostat control are placed on the left side control side All devices dedicated to communication with the PC are placed on the right side interface side Figure 2 Board details Load connectors Control side Interface side On off LED Temp setting push buttons Jumpers for working mode setting Capacitive p T power supply Optoinsulators Temp setting LEDs lt Defrost ACS Switch for shared pins STM32 NTC Door switch GUI vs stand alone conn conn STM8 AM12238v1 6 43 Doc ID 023172 Rev 1 ky UM1542 Kit introduction These two parts consist of see Appendix B for the schematic Control side Capacitive power supply supplying only the control side of the board The average output current of the capacitor power supply is about 25 mA with the embedded 1 uF C29 capacitor for a 230 V 50 Hz line RMS voltage STM8S003 microcontroller low cost MCU dedicated to thermostat control AC switches an
33. ential as shown in Equation 3 Equation 3 11 To create a simple voltage sensor it is better to linearize the temperature response using constant resistor R49 in schematic Appendix B added in series with the NTC A voltage divider is then implemented The voltage across R49 follows the supply voltage Vga according to the relationship below Equation 4 o Rye T _ T Rag S dd To make the relationship of Equation 4 vary linearly it s sufficient to ensure that the second order derivative is zero Equation 5 gives the R49 value to ensure this condition Equation 5 2 d 2 irt 2 To linearize the voltage response the M2020 5 k from EPCOS between 20 and 5 C 30 resistor should be chosen for R49 In this temperature range Vs varies according to Equation 6 for a 5 V supply Equation 6 T 51 84 0 1671943 Figure 10 gives the variation of Vs and the linear value given by Equation 6 versus the temperature sensed by the NTC ky Doc ID 023172 Rev 1 25 43 Thermal sensor linearization UM1542 Figure 10 Linear voltage in function of the NTC resistor for a 5 V power supply AM12246v1 26 43 Doc ID 023172 Rev 1 ky Schematics UM1542 Schematics Appendix B Control side schematic Figure 11
34. ftware In order to use the GUI of the STEVAL IHT001V2 kit a recent version of Windows starting from Windows XP with SP3 must be installed on the user s computer To install the PC software GUI tool e Put the companion CD ROM into the PC e Browse the CD ROM directory to locate the GUI setup executable file e Double click on the GUI setup executable file e Follow the instructions as they appear on the screen An insulated interface is embedded in the board By means of the STM32 MCU the user is able to manage monitor the control parameters of the thermostat For more details please refer to the GUI Help menu GUI windows description Temperature control tab Choosing one of the temperature orders is done using the thermostat order switch position on the GUI Figure 7 or using the temp selector push buttons and on the board If Thermostat order or Led temperature VL then evaporator temperature order evaporator temperature order 1 Very Low If Thermostat order or Led temperature L then evaporator temperature order evaporator temperature order 2 Low If Thermostat order or Led temperature M then evaporator temperature order evaporator temperature order 3 Medium If Thermostat order or Led temperature H then evaporator temperature order evaporator temperature order 4 High If Thermostat order or Led temperature VH then eva
35. ge signal at STM8 input TP5 OUT pin of the ACS102 light bulb TP6 OUT pin of the ACST6 compressor TP7 OUT pin of the ACS110 defrost TP8 OUT pin of the ACS102 fan Pulse control All loads are controlled in full cycle mode by a pulsed gate current The STM8 MCU senses both the mains rising and falling edges to synchronize the gate pulse with the mains voltage Figure 6 shows the different times useful to understand when the gate current pulses are applied for the four AC switches Q1 Q2 Q3 Q4 e is the mains voltage compressor current phase shift It helps to apply the gate current pulse just when the Q1 current reaches zero in order to control the compressor Doc ID 023172 Rev 1 15 43 Using the STEVAL IHT001V2 thermostat kit UM1542 16 43 in full cycle mode A higher delay could be applied to test the compressor in phase angle mode if required for example to decrease the power dissipated by the compressor T2 is the gate current pulse width for Q2 defrost resistor T3 is the gate current pulse width for Q1 compressor T4 is the mains voltage fan current phase shift T5 is the gate current pulse width for Q3 fan T6 is the gate current pulse width for Q4 light bulb Figure 6 Timing definition for gate current pulses Gate current Compressor A Gate current Defrost A Gate current Fan A Gate current Light Bulb A t t t AM12242v1 Ga
36. he MAINS POWER connector Plug the mains wire into the mains voltage 5 After a few seconds during which the MCU setup operations and frequency measurement operation take place a popup window indicating that the device has been recognized appears in the PC As soon as the popup appears it is possible to connect the thermostat board and the thermostat GUI software by pushing the virtual button Connect For troubleshooting issues in standalone mode verify the following e IfnoLED is ON check the jumpers they have to be set as in Table 4 standalone mode or replace the fuse e Ifthe LEDs seem OK reset the STM8 microcontroller using button SW1 Otherwise unplug the board from the mains discharge the VDD supply with a short circuit between VDD and GND and plug the board back to the mains For troubleshooting issues in PC GUI driven mode verify the following e Ensure that switch SW8 is in the GUI MODE position e Checkthat the correct COM port is selected refer to the GUI Help menu for details e Repeat the startup operation in particular if mains voltage has been turned off ensuring that the USB cable is plugged in before the mains wire is connected i e the interface side must by powered on before the control side e f popup appears in the PC just wait a few seconds before connecting the GUI after the board has been powered ON 3 5 3 Operating modes When the board works in standalone mode control parameters t
37. mal sensor NTC is a class 2 sensor and can be put on non earthed accessible and conductive parts The STEVAL IHT001V2 kit provides added value in terms of Low cost solution for spark free thermostat No need for a sealed version Low cost STM8S microcontroller for thermostat control Low cost capacitive power supply e Efficiency Fridge consumption lowered by adjusting and reducing the hysteresis threshold of the temperature control not easy with mechanical thermostats Improved efficiency by turning on the defrost resistor only when it s useful and not at each OFF cycle of the compressor as done in some mechanical thermostats e Flexibility Customization program setting with PC interface to change firmware variables ndustrialization end of production MCU programming thanks to FLASH for soft upgrade and efficient MCU stock management Ensured functions Temperature control For the thermal sensor an insulated class 2 NTC resistor has been used The part number is B57020M2502A020 from EPCOS which is commonly used for these applications The value of this resistor increases when temperature decreases according to an exponential law In order to linearize this relation thus allowing an easier measurement a series resistor has been added see Appendix A for details The NTC must be placed on the evaporator of the fridge or the freezer The controlled evaporator temperature should be in the range 4
38. nection with ST products STMicroelectronics NV and its subsidiaries ST reserve the right to make changes corrections modifications or improvements to this document and the products and services described herein at any time without notice All ST products are sold pursuant to ST s terms and conditions of sale Purchasers are solely responsible for the choice selection and use of the ST products and services described herein and ST assumes no liability whatsoever relating to the choice selection or use of the ST products and services described herein No license express or implied by estoppel or otherwise to any intellectual property rights is granted under this document If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein UNLESS OTHERWISE SET FORTH IN ST S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION OR INFRINGEMENT OF ANY PATENT COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RI
39. o be considered pulses timings temperatures fridge version etc are the last ones uploaded in the GUI If no parameter has ever been uploaded the default values are those shown in Table 3 factory settings In standalone mode the temperature order is set by means of the two push buttons TEMP and indicated by the five green LEDs see Figure 2 and the AC loads are driven according to the order to the sensed temperature and to the door switch In PC GUI mode the user can upload the control parameters loaded in the STM8 MCU check them and eventually modify them Temperature order is no longer displayed using the 5 LEDs D4 D5 D7 D8 D9 but is displayed in the GUI only virtual LEDs VL L M H VH AC loads can be driven not only according to temperature but their state can be forced by the GUI in debug mode see Section 3 6 3 for details The user can put the STM8 in halt mode by holding button SW3 TEMP for 5 s This low power mode can be exited by a single push on SW4 TEMP button A beep warns at each halt mode enter exit It should be noted that since push buttons SW3 and SWA are disabled when the door is open the user cannot enter exit halt mode if the DOOR switch SW2 otherwise the external switch wired to connector J15 is in the open position Doc ID 023172 Rev 1 19 43 Using the STEVAL IHT001V2 thermostat kit UM1542 3 5 4 3 6 3 6 1 Note 20 43 Instructions for the GUI so
40. porator temperature order evaporator temperature order 5 Very High The value of the five temperature orders and temperature hysteresis has to be set according to the appliance and the desired cabinet temperature for each operation They is displayed through the five virtual LEDs shown in Figure 7 Thermostat order evaporators temperature orders and temperature hysteresis are sent and received by clicking on the Set or Get buttons respectively Note that the default evaporators temperature orders and temperature hysteresis are given in Appendix G and can be retrieved by clicking on the Restore Default push button Doc ID 023172 Rev 1 ky UM1542 Using the STEVAL IHT001V2 thermostat kit 3 6 2 Figure 7 GUI temperature control tab Temperature Control Temperature hysteresis y v Evaporator temperature order 2 Low Evaporator temperature order 1 Very Low Thermostat Order J Medium Evaporator temperature order Medium Evaporator temperature order 4 High Very Low Very High Evaporator temperature order 5 Very High 1 lt gt lt Restore Default Get Set Board connection e e 9 e wu d gw d Temperature Order VH AM12243v1 Timing control tab This section Figure 8 controls the gate current width for the AC switches the delay to switch ON the AC switches Q1 for compressor and Q3 for fan the ZVS delay the delay to activate defros
41. port The power supply to the EUT was placed on an insulation support 0 1 above the ground reference plane Bursts were directly coupled with equipment The test generator was placed directly on and bonded to the ground reference plane The board was not connected to the earthing system Figure 16 Test setup NTC Thermostat board resistor Bursts generator Blocks of ice Loads AM12279v1 According to the IEC 61000 4 4 the test signals were characterized by e Polarity positive negative e Burst duration 15 ms 20 at 5 kHz Figure 17 0 75 ms x 20 at 100 kHz e Burst period 300 ms 20 Duration time 1 minute e Applied to supply voltage line and neutral 36 43 Doc ID 023172 Rev 1 ki UM1542 Procedure to apply IEC 61000 4 4 burst test Note The generic graph of a fast transient burst is shown in Figure 17 Figure 17 General graph of a fast transient burst Burst 5kHz 15 T5 Burst duration Burst period 300 ms AM12252v1 The board withstands up to 4 5 kV and 4 3 kV positive and negative pulses respectively at 5 kHz and up to 3 1 kV positive and negative pulses at 100 kHz At higher voltages up to 5 kV at 5 kHz and 100 kHz temporary disturbance of performance which ceased after the fast burst voltage ceased was detected The equipment under test recovered its normal performance without operator intervention after the disturbance ceased Because the
42. rd Appendix B It should be noted that an R23 resistor has been added in series with Q4 Indeed as the lamp lifetime ends the filament breaks The overall filament can be short circuited by the flashover and the load current is no longer limited This current can exceed the 14 capability of the ACS and destroy it cf AN1172 To avoid destroying the ACS102 at each lamp flashover a power resistor is added in series with the light This resistor is rated in order to limit the ACS current to its 1 value 10 A for a 10 ms half sinus conduction In this case 33 1 2 resistor is sufficient These resistor pads could be also used to put an inductor to limit the dl dt if a CFL LED lamp is used in dimming mode Defrost resistor and fan control Defrost resistor is controlled only when the thermostat is set to Defrost or to air circulation versions while the fan is controlled only in the air circulation version The defrost resistor is driven by the ACS110 7SB2 Q2 on the thermostat board see Appendix B This device is turned on following the Defrost activation delay parameter time defined in the GUI software This time is compared to the sum of the compressor ACST ON times When this sum is higher than the Defrost activation delay defrost resistor ACST is enabled and then switched on as soon as the evaporator temperature is higher than THiGH Figure 4 It remains on during the Defrost duration time defined in
43. s corresponding to the pre selected load become yellow but this has no effect until the Debug Active button is pushed If the debug mode is active Debug push button is lit then e Clicking on the Compressor Fan button turns on Q1 and Q3 i e the compressor and fan e Clicking on the Light Bulb button turns on Q4 and then the bulb lights up e Clicking on the Defrost button turns on Q2 and then the defrost resistor starts to heat The defrost and compressor loads cannot be switched on at the same time Setting defrost resets compressor and vice versa The light bulb and fan cannot be switched on at the same time The fan switches off as soon as the light bulb switches on In order to go back to the normal mode the user must click on the Debug button In this case all the virtual button green lights turn off Figure 9 GUI debug mode frame Debug Mode AM12245v1 Parameter measurements The GUI is able to get and display the different parameters from the MCU like the temperature order the evaporator temperature the AC load state the compressor cycle information running period and duty cycle and the mains frequency For more information refer to the Help menu of GUI software To enable real time data acquisition the user must push on the Start Acquisition button refer to the Help menu of the GUI software for more information The sampling frequency can be set in the Options
44. sulated power source may result in damage to the PC Table 4 Jumper default configuration in standalone or PC driven operating mode Jumper Mandatory configuration 123 i23 P 123 S 123 Ps In order to select the operating mode switch SW8 must be set as shown Table 5 Please note that once the thermostat board is operating the operating mode cannot be changed In order to change the mode of operation the user must power off the board move switch SW8 and power ON again Section 3 5 2 Doc ID 023172 Rev 1 17 43 Using the STEVAL IHT001V2 thermostat kit UM1542 3 5 2 18 43 Table 5 Operating mode selector Operating mode Description Standalone mode PC driven mode STAND ALONE LED5 Usart TXsus SW8 PC GUI Getting started To operate the STEVA LIHT001V2 board correctly follow the steps below given for each mode Standalone mode 1 Connect the NTC thermistor to the NTC connector on the thermostat board control side Connect the DOOR switch if an external door switch is going to be used to the DOOR SWITCH connector on the thermostat board control side and set the door switch embedded on the board to the open position to allow the external switch to drive the door pin Otherwise if no external door switch is used move the embedded one to the desired position open or close Note that when it is set in the open position no
45. t and the defrost duration These parameters are sent and received by clicking on the Set or Get buttons respectively Note that the default parameters are given in Appendix G and they can be retrieved by clicking on the Restore Default push button Figure 8 GUI timing control window Timing Control Compressor Defrost Duration Pulse Width 9 HCM Defrost Activation Delay Light Bulb Pulse Width E Defrost Adjust the ZVS delay 9 9 ELM Fan Pulse Width Phase Shift Y NEIN AM12244v1 The ZVS delay is the delay between the AC mains zero voltage and the detection of this zero voltage by the MCU in order to synchronize the MCU orders with the AC mains voltage The MCU uses the zero voltage crossing ZVC events to synchronize the AC switches gate current pulses Doc ID 023172 Rev 1 21 43 Using the STEVAL IHT001V2 thermostat kit UM1542 3 6 3 Note 3 6 4 22 43 Force debug A force debug is used to force the AC load state to the control state as defined by the MCU for easier board validation Figure 9 In order to control the AC loads it is necessary to click on the Debug Active button in the Debug Mode frame In this case the green lights of the AC load buttons are on if the associated loads are also on Otherwise the user can pre select the load to be switched on before clicking on the Debug Active push button in which case the button
46. te current pulse delays and widths can be adjusted using the GUI in order to ensure the right control of loads otherwise the default parameters shown in Table 3 are used Table 3 Allowable ranges for gate current pulses Parameter Reference Factory setting ms Compressor phase shift T1 0 5 0 1 t0 5 Pulse width for defrost resistor control T2 1 0 1 to 3 Pulse width for compressor control T3 3 0 1 to 4 Fan phase shift T4 0 5 0 1 to 5 Pulse width for fan T5 2 0 1 to 3 Pulse width for light bulb control T6 5 0 1105 Doc ID 023172 Rev 1 Using the STEVAL IHT001V2 thermostat kit UM1542 3 5 Getting started 3 5 1 Jumper configuration for standalone or PC driven modes The control side of the thermostat board is supplied by the capacitive power supply refer to Section 2 3 3 As for the communication side it is only supplied by the PC using the USB connector Default jumper positions are indicated in the silkscreen and in Table 4 Normally the user must not move jumpers J4 J5 J8 J18 from the default position They be moved only by programming experts in order to modify 8 firmware for specific purposes or adaptation to dedicated applications refer to Appendix F for the procedure to follow Warning Please take careful note of the jumper configuration given in Table 4 before powering up the board whatever the mode of operation Incorrect jumper configuration with a non in
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