STEVAL-IHT002V1
Basic thermostat control board for cooling applications based on ST7LITEUS5
Data Brief
Features
Capacitive power supply providing approximately 30 mA at 220 VAC 50 Hz Temperature level regulation (potentiometer) Temperature measurement input (external NTC 5k) Zero voltage switching (ZVS) to synchronize the gate pulses with the mains Stall rotor detection via AC switch temperature monitoring ST7Ultralite 8-bit, 8-pin MCU running at 1 MHz (internal clock) ICC programming connector STEVAL-IHT002V1
Description
The STEVAL-IHT002V1 is a low-cost evaluation board designed to replace existing mechanical thermostats. While driving a compressor, the evaluation board is also capable of driving the RUN winding, replacing the PTC and directly driving the START winding. Stall rotor detection is also implemented. These functions are oriented towards reducing total power consumption. The evaluation board is based on the new low-cost, 8pin, 8-bit ST7Ultralite microcontroller (MCU), which controls the entire process. The MCU is equipped with programmable Flash memory, a 1 MHz internal clock source and runs 1 KB C-based software. Although the evaluation board is specially designed to drive small to mid-size compressors, it is fully customizable and adaptable to any other application where thermostat or temperature control is required.
October 2007
Rev 1
1/4
www.st.com 4
For further information contact your local STMicroelectronics sales office.
STEVAL-IHT002V1
+VD D
+VD D
U1 ST7U LTR ALI TE
+VD D
+VD D
C3 100nF
R 14 10K 1%
1 VD D VSS 8 2
P1 50K
R5 10K
2 4 6 8 10
+VD D
PA5/ AI N 4/ C LKI N / ei4 ei0/ I C C D ATA/ ATPWM/ AI N 0/ PA0
7
3 PA4/ AI N 3/ MC 0/ ei3 ei1/ I C C C LK/ AI N 1/ PA1 6
1 3 5 7 9
J2 C ON 10A ICC Programmer
R 12 100K 1%
4 PA3/ R ESET ei2/ LTI C / AI N 2/ PA2 5
R2 12K 1%
+VD D
R 13 100K
+VD D
R7 10K
C5 1nF
R 11 560K
+VD D R8 300
G
+VD D R9 300
COM TR 2 AC ST67S
G
TR 1 AC ST67S
COM
R3 5K
R6 10K
R4 12K 1%
Q1 BC 337
OUT
L1 6. 8uH
OUT
R10* 47 3W
J3 C ON 3 3 2 1
C4 10nF
START RUN LINE
Board schematic
+VD D
Schematic
J1 C ON 3 MAINS
NEUTRAL LINE
N eut ral
1 2 3
C6 47nF 275~ X2
Line
C1 1uF 275~ X2
D1 1N 4007
D Z1 5V6 1/ 2W
R1 47 1W
+
D2 1N 4007
C2 1000uF 16V 105C
Board schematic
Figure 1.
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STEVAL-IHT002V1
Revision history
2
Revision history
Table 1.
Date 26-Oct-2007
Document revision history
Revision 1 Initial release Changes
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STEVAL-IHT002V1
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