for further information contact your local stmicroelectronics sales office. october 2012 doc id 023175 rev 3 1/7 7 STEVAL-IHT001V2 cold thermostat kit based on ac switches and the stm8s data brief features low-cost solution for spark-free thermostats: ? no need for a sealed version ? low-cost stm8s microcontroller for thermostat control ? low-cost capacitive power supply high efficiency: ? refrigerator consumption reduction by adjusting and reducing the hysteresis threshold of the temperature ? 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) high system immunity: ? overvoltage protected acs switches: acst610-8fp for compressor control, acs110-7sn for defrost resistor and acs102-6ta for light bulb and fan ? class a criteria for iec 61000-4-4 up to above 3 kv levels flexibility: ? development: program setting with pc interface to change firmware variables ? industrialization: end-of-production mcu programming thanks to flash, for soft upgrade and efficient mcu stock management rohs compliant description the STEVAL-IHT001V2 thermostat kit provides a robust and low-cost st solution (microcontroller and ac switches) to control refrigerators, freezers or fridge/freezer combinations. basic, defrost, and air circulation versions are configurable in order to address the low-end and medium-end cooling appliances market. it allows the control of a single-phase induction motor and a light bulb, and optionally, a defrost resistor and a fan, working on 220/240 v rms , 50/60 hz mains voltage. the thermostat kit is operational with 100/120 v rms 50/60 hz but the supply capacitor value must be modified. the board can operate in an ambient temperature range from 0 c to 60 c. the exact maximum temperature depends on the power of the loads. for demonstrative purposes a graphic user interface (gui) has been developed. the connection between the pc and stm8s microcontroller, the mcu performing thermostat regulation, is achieved through a usb bus. as the stm8s is a low-cost mcu without an embedded usb peripheral, an additional mcu (stm32) has been used as a bridge between the pc and stm8s mcu, for demonstrative purposes only. www.st.com
schematic diagrams STEVAL-IHT001V2 2/7 doc id 023175 rev 3 1 schematic diagrams figure 1. control side schematic ! - v ' 2 2 5 6 : , 7 & + 7 ( 0 3 3 8 6 + % 8 7 7 2 1 7 ( 0 3 3 8 6 + % 8 7 7 2 1 = 9 6 b 3 , 1 & 2 0 3 5 ( 6 6 2 5 b 3 , 1 ' ( ) 5 2 6 7 b 3 , 1 ) $ 1 b 3 , 1 / , * + 7 b 3 , 1 / ( ' / ( ' / ( ' / ( ' / ( ' 1 7 & % 8 = = ( 5 ' 2 2 5 6 : , 7 & + 7 ( 0 3 3 8 6 + % 8 7 7 2 1 7 ( 0 3 3 8 6 + % 8 7 7 2 1 9 & & b 0 $ , 1 6 * 1 ' b 6 7 0 * 1 ' b 6 7 0 9 & & b 6 7 0 * 1 ' b 6 7 0 9 & & b 6 7 0 9 & & b 6 7 0 * 1 ' b 6 7 0 9 & & b 6 7 0 * 1 ' b 6 7 0 9 & & b 0 $ , 1 6 * 1 ' b 6 7 0 5 . 5 2 + 0 ) ) 8 6 ( + 2 / ' ( 5 ) & x ) ; & 5 2 + 0 : p h w d o o l f 5 & q ) 5 2 + 0 : ' 5 ( ' b / ( ' & q ) 5 2 + 0 : ' * 5 ( ( 1 b / ( ' 7 3 / / 5 . & q ) - & 2 1 & q ) & q ) & q ) 5 2 + 0 : p h w d o o l f - 1 7 & & q ) ; & 7 3 9 ' ' 9 ' ' 7 3 ) $ 1 5 7 3 5 8 1 5 2 + 0 5 2 + 0 4 $ & 6 7 $ 4 - ' ( ) 5 2 6 7 & q ) & 7 3 ' ( ) 5 2 6 7 7 3 / , * + 7 6 : 7 3 8 6 + % 8 7 7 2 1 ' * 5 ( ( 1 b / ( ' 5 . & q ) 7 3 1 7 3 = 9 6 4 4 5 . 4 $ & 6 4 $ & 6 5 2 + 0 ' * 5 ( ( 1 b / ( ' ' * 5 ( ( 1 b / ( ' 6 : ' 2 2 5 6 : , 7 & + 4 $ & 6 7 $ - & 2 0 3 5 ( 6 6 2 5 6 : 7 3 8 6 + % 8 7 7 2 1 5 2 + 0 - ) $ 1 5 2 + 0 - ' 2 2 5 6 : , & + 7 3 = % 8 = = ( 5 5 2 + 0 ' 9 : ' 5 9 9 $ 5 , 6 7 2 5 & q ) & q ) ' * 5 ( ( 1 b / ( ' 5 2 + 0 5 2 + 0 : p h w d o o l f 5 . 2 + 0 : p h w d o o l f 5 2 + 0 : 5 - / , * + 7 5 2 + 0 5 2 + 0 : 7 3 * 1 ' 7 3 * 1 ' ' 1 & q ) & q ) & x ) ! # 3 4
STEVAL-IHT001V2 schematic diagrams doc id 023175 rev 3 3/7 figure 2. control side schematic - stm8s ! - v 3 ' 3 & 6 7 0 b 6 : , 0 3 & 3 ' $ g g l w l r q d o / ( ' % 8 = = ( 5 8 6 $ 5 7 b 5 ; b 6 7 0 8 6 $ 5 7 b 7 ; b 6 7 0 8 6 $ 5 7 b & 7 6 b 6 7 0 / ( ' / ( ' ' 2 2 5 6 : , 7 & + & 2 0 3 5 ( 6 6 2 5 b 3 , 1 / , * + 7 b 3 , 1 ' ( ) 5 2 6 7 b 3 , 1 6 7 0 b 5 ( 6 ( 7 $ ' ' , 7 , 2 1 $ / / ( ' 7 ( 0 3 3 8 6 + % 8 7 7 2 1 3 2 7 ( 1 7 , 2 0 ( 7 ( 5 7 ( 0 3 3 8 6 + % 8 7 7 2 1 1 7 & / ( ' $ ' ' , 7 , 2 1 $ / 3 8 6 + % 8 7 7 2 1 / ( ' 6 : , 0 b o l q h 6 7 0 b 5 ( 6 ( 7 ) $ 1 b 3 , 1 = 9 6 b 3 , 1 / ( ' 9 & & b 6 7 0 * 1 ' b 6 7 0 * 1 ' b 6 7 0 9 & & b 6 7 0 * 1 ' b 6 7 0 * 1 ' b 6 7 0 9 & & b 6 7 0 5 2 + 0 5 2 + 0 5 . 5 . 5 5 & q ) & q ) 6 : 5 ( 6 ( 7 6 : 5 ( 6 ( 7 & q ) & q ) 5 5 & q ) & q ) 5 2 + 0 5 2 + 0 8 6 7 0 6 ) 8 6 7 0 6 ) 3 ' 3 ' 8 $ 5 7 b 7 ; 3 ' 8 $ 5 7 b 5 ; 1 5 6 7 3 $ 3 $ 9 & $ 3 3 $ + 6 9 ' ' 9 6 6 3 % 7 3 & + 6 3 & + 6 3 & + 6 3 & + 6 3 & + 6 3 ' + 6 6 : , 0 3 % 7 3 ' + 6 $ , 1 3 ' + 6 $ , 1 6 : 6 : ' 3 ' 7 6 : 6 : ' 3 ' 7 5 2 + 0 5 2 + 0 & q ) & q ) & q ) & q ) & x ) & x ) - 6 : 6 3 ' 7 - 6 : 6 3 ' 7 & q ) & q ) & q ) & q ) 5 5 5 5 5 2 + 0 5 2 + 0 ' 1 ' 1
schematic diagrams STEVAL-IHT001V2 4/7 doc id 023175 rev 3 figure 3. interface side schematic ! - v 6 / , 4 ! ' % 2 % ' 5 , ! 4 / 2 5 3 " # / . . % # 4 / 2 $ # $ # # / . 6 % 2 4 % 2 / 0 4 /
# / 5 0 , % 2 3 3 7 0 2 / ' $ " 5 ' # / . . % # 4 / 2 8 6 % b ' , 6 & 2 1 1 ( & 7 6 : ' , 2 6 : & / . 5 ( 6 ( 7 6 7 0 b 5 ( 6 ( 7 8 6 % b ' , 6 & 2 1 1 ( & 7 6 : ' , 2 6 : & / . 6 7 0 b 5 ( 6 ( 7 8 6 % b ' 3 8 6 % b ' 0 8 6 $ 5 7 b 5 ; b 6 7 0 8 6 $ 5 7 b 7 ; b 6 7 0 8 6 $ 5 7 b 7 ; b 6 7 0 8 6 $ 5 7 b 5 ; b 6 7 0 8 6 $ 5 7 b & 7 6 b 6 7 0 8 6 $ 5 7 b & 7 6 b 6 7 0 8 6 $ 5 7 b & 7 6 b 6 7 0 8 6 $ 5 7 b 7 ; b 6 7 0 8 6 $ 5 7 b 5 ; b 6 7 0 8 6 % b ' 3 8 6 % b ' 0 6 : , 0 b o l q h 6 7 0 b 5 ( 6 ( 7 9 & & b 9 8 6 % b 9 9 & & b 9 8 6 % b 9 9 & & b 9 8 6 % b 9 ' & ' & b 9 ' & ' & b 9 9 & & b 9 ' & ' & b 9 9 & & b 9 ' & ' & b 9 9 & & b 9 9 & & b 9 9 & & b 9 9 & & b 9 9 & & b 9 9 & & b 9 ' & ' & b 9 9 & & b 0 $ , 1 6 9 & & b 6 7 0 8 6 % b 9 * 1 ' b 6 7 0 * 1 ' b 6 7 0 ' / ( ' ' / ( ' 5 2 + 0 5 2 + 0 5 0 5 0 & q ) & q ) & x ) & x ) & s ) & s ) & x ) & x ) 5 2 + 0 & q ) & q ) & q ) & q ) & q ) & q ) 5 . 5 . 5 2 + 0 5 2 + 0 5 2 + 0 5 2 + 0 & x ) & x ) & q & q - 6 : , 0 b f r q q h f w r u - 6 : , 0 b f r q q h f w r u 5 0 5 0 & x ) & x ) & x ) & x ) - & 2 1 - & 2 1 & q ) & 8 8 6 % 8 ) : 8 ' * 1 ' ' ' 9 ' & x ) & x ) - & 2 1 - & 2 1 8 / ' 8 / ' * 1 ' 9 2 8 7 9 2 8 7 9 , 1 q f 9 2 8 7 9 2 8 7 q f & q ) & q ) - 7 ( 6 1 - 9 l q 9 l q 9 r x w 9 r x w 1 & 5 . 5 . - & 2 1 - & 2 1 8 $ & 3 / / 8 $ & 3 / / 9 ' ' 9 , q f * 1 ' * 1 ' 9 2 q f 9 ' ' < 0 + ] < 0 + ] 5 . 5 . & q ) & & 1 8 6 % b 0 , 1 , % 5 2 + 0 5 2 + 0 8 $ & 3 / / 8 9 ' ' 9 , q f * 1 ' * 1 ' 9 2 q f 9 ' ' 5 . 5 . & x ) & x ) & s ) & s ) 8 $ & 3 / / 8 $ & 3 / / 9 ' ' 9 , q f * 1 ' * 1 ' 9 2 q f 9 ' ' & q ) & 8 6 7 0 ) & 8 6 7 0 ) & 3 $ 8 6 $ 5 7 b & 7 6 3 $ 8 6 $ 5 7 b 5 7 6 3 $ 8 6 $ 5 7 b 7 ; 3 $ 8 6 $ 5 7 b 5 ; 3 $ 6 3 , 1 6 6 3 $ 6 3 , 6 & . 3 $ 6 3 , 0 , 6 2 3 $ 6 3 , 0 2 6 , 3 $ 8 6 $ 5 7 & . 3 $ 8 6 $ 5 7 7 ; 3 $ 8 6 $ 5 7 5 ; 3 $ 8 6 $ 5 7 & 7 6 8 6 % ' 0 3 $ 8 6 $ 5 7 5 7 6 8 6 % ' 3 3 $ - 7 0 6 6 : ' , 2 3 $ - 7 & . 6 : & / . 3 $ - 7 ' , 3 ' 2 6 & b , 1 3 ' 2 6 & b 2 8 7 1 5 6 7 % 2 2 7 9 ' ' $ 9 6 6 $ 9 6 6 9 6 6 9 6 6 9 % $ 7 9 ' ' 9 ' ' 9 ' ' 3 & 7 $ 0 3 ( 5 5 7 & 3 & 2 6 & , 1 3 & 2 6 & 2 8 7 3 % $ ' & , 1 3 % $ ' & , 1 3 % % 2 2 7 3 % - 7 ' 2 3 % - 1 5 6 7 3 % , & b 6 0 % $ 3 % , & b 6 & / 3 % , & b 6 ' $ 3 % 3 % 3 % 3 % 3 % 3 % 3 % 3 % - 6 : ' b f r q q h f w r u - 6 : ' b f r q q h f w r u
STEVAL-IHT001V2 schematic diagrams doc id 023175 rev 3 5/7 figure 4. additional pads schematic ! - v $ g g l w l r q d o / ( ' $ g g l w l r q d o / ( ' $ ' ' , 7 , 2 1 $ / 3 8 6 + % 8 7 7 2 1 3 2 7 ( 1 7 , 2 0 ( 7 ( 5 * 1 ' b 6 7 0 * 1 ' b 6 7 0 9 & & b 6 7 0 * 1 ' b 6 7 0 * 1 ' b 6 7 0 9 & & b 6 7 0 6 : ' 1 ) 6 : ' 1 ) ' ' 1 ) ' ' 1 ) 5 ' 1 ) 5 ' 1 ) 5 ' 1 ) 5 ' 1 ) & ' 1 ) & ' 1 ) ' ' 1 ) ' ' 1 ) 5 ' 1 ) 5 ' 1 ) 5 ' 1 ) 5 ' 1 ) & ' 1 ) & ' 1 )
revision history STEVAL-IHT001V2 6/7 doc id 023175 rev 3 2 revision history table 1. document revision history date revision changes 31-may-2012 1 initial release. 18-sep-2012 2 changed: figure in cover page and figure 1 16-oct-2012 3 updated features.
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