STEVAL-IHT001V1 STMicroelectronics, STEVAL-IHT001V1 Datasheet - Page 8

• Manufacturer Part Number: STEVAL-IHT001V1
• Description: EVAL BOARD THERMO CONTROL REFRIG
• Manufacturer: STMicroelectronics

Specifications of STEVAL-IHT001V1

• Design Resources: STEVAL-IHT001V1 Gerber Files STEVAL-IHT001V1 Schematic STEVAL-IHT001V1 Bill of Materials
• Main Purpose: Reference Design, ARM7 Thermostat for Fridge or Freezer
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: ACS102-6, ACS110, ACST6, ST7LITE39F2
• Primary Attributes: Compressor, Defrost & Light Controls
• Secondary Attributes: Graphical User Interface
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5514

Functional description
Note:
2.3
2.3.1
8/32
Figure 4.
The ACS110-7SB2 switch can drive a fan instead of a defrost resistor in order to move the
air around the coils inside the refrigerator. This fan helps to increase the cooling efficiency,
and also speeds up the defrost process.
Hardware features
ACS and ACST devices
The STEVAL-IHT001V1 board embeds one ACS102-6TA, one ACS110-7SB2 and one
ACST6-7ST switches. The datasheet of these devices can be found in our web site (go to
www.st.com/thyristors).
switches and traditional TRIACs.
Table 1.
Sum of Compressor ON times > DEFROST
ACTIVATION DELAY
Overvoltage Protection
TEMP1
TEMP1
TEMP2
TEMP2
(dI/dt) at turn-on
Igt (mA)
Device
(dV/dt)
Defrost activation principle
Differences between ACS/ACST and TRIACs
Compressor
Compressor
DEFROST
DEFROST
Defrost enabled
Table 1
Evaporator temperature evolution
Evaporator temperature evolution
1A TRIAC
20 V/µs
10 A/µs
No
sums up the main differences between ACS and ACST
5
Evaporator temperature > TEMP1
300 V/µs
ACS102
20 A/µs
Yes
5
1A TRIAC
Defrost turn-on
50 V/µs
20 A/µs
No
10
∆t
∆t
After DEFROST DURATION (∆t)
500 V/µs
ACS110
50 A/µs
Yes
10
Defrost turn-off
Compressor turn-on
6A TRIAC
100 V/µs
20 A/µs
No
10
200 V/µs
100 A/µs
ACST6
UM0277
t
t
Yes
t
t
t
t
10