AN2446 Datasheet, PDF (1/13 Pages) STMicroelectronics – STEVAL-IHT002V1 Intelligent thermostat for compressor based on ST7Ultralite MCU

AN2446
Application note
STEVAL-IHT002V1
Intelligent thermostat for compressor based on ST7Ultralite MCU
Introduction
The STEVAL-IHT002V1 is a very low-cost evaluation board designed with the intent to
replace the existing mechanical thermostat.
While driving a compressor, the evaluation board is able to drive the RUN winding, replace
the PTC and drive directly the START winding too. Stall rotor detection is also implemented.
Both functions are oriented to reduce the total power consumption.
The evaluation board is based on the new low-cost, 8-pin, 8-bit ST7Ultralite microcontroller
(MCU), which controls the entire process. The MCU is equipped with a programmable Flash
memory, 1 MHz internal clock source and runs 1 KByte C-based software.
Even if the evaluation board is especially designed for driving small-size or mid-size
compressors, it is fully customizable and adaptable to any other application where
thermostat or temperature control is required.
An STMicroelectronics Patent Application is pending for the compressor control device and
the method for controlling a compressor described in this document.
This document provides a complete description on how to customize the evaluation board.
STEVAL-IHT002V1 evaluation board
February 2007
Rev 1
1/13
www.st.com