UM1542 datasheet(7/43 Pages) STMICROELECTRONICS

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UM1542

Kit introduction

Doc ID 023172 Rev 1

7/43

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 µF C29 capacitor (for a 230 V-50 Hz line RMS voltage)

–

STM8S003 microcontroller, low-cost MCU dedicated to thermostat control

–

AC switches: an 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

●

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 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.

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