STEVAL-IHT001V1 STMicroelectronics, STEVAL-IHT001V1 Datasheet - Page 17

• 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

UM0277
3.5.2
Figure 10. Temperature control tab
Timing control
The Timing Control tab
to switch ON the TRIACs Q1 (for compressor), the ZVS delay, the delay to activate defrost
and the defrost duration. Note that the initial parameters are given in
parameters are sent and received by clicking on “Set” or “Get” buttons, respectively.
Figure 11. Timing control tab
The ZVS delay is the delay between the AC mains zero voltage and the detection of this
zero voltage by MCU in order to synchronize the MCU orders with the AC mains voltage.
The MCU uses Zero Voltage Crossing (ZVC) events to synchronize the TRIACs' gate
current pulses. The LINE voltage is connected to the input pin through two resistors (R7 and
R8). An interruption will then occur at each ZVC event. As soon as the ZVC is detected, the
AUTO-RELOAD Timer is started and a routine is launched to define the PORT A
configuration. The required time introduces then a delay from the ZVS. The maximum delay
(Figure
11) controls the gate current width for the TRIACs, the delay
Appendix
Getting started
F. These
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