ST Life.augmented

STEVAL-IHT001V2

Cold thermostat kit based on AC switches and the STM8S
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The STEVAL-IHT001V2 thermostat kit provides a robust and low-cost ST solution (microcontroller and AC switches) to control refrigerators, freezers or fridge/freezer combinations.

Basic, defrost, and air circulation versions are configurable in order to address the low-end and medium-end cooling appliances market. It allows the control of a single-phase induction motor and a light bulb, and optionally, a defrost resistor and a fan, working on 220/240 VRMS, 50/60 Hz mains voltage. The thermostat kit is operational with 100/120 V RMS 50/60 Hz but the supply capacitor value must be modified.

The board can operate in an ambient temperature range from 0 °C to 60 °C.

The exact maximum temperature depends on the power of the loads. For demonstrative purposes a graphic user interface (GUI) has been developed.

The connection between the PC and STM8S microcontroller, the MCU performing thermostat regulation, is achieved through a USB bus.

As the STM8S is a low-cost MCU without an embedded USB peripheral, an additional MCU (STM32) has been used as a bridge between the PC and STM8S MCU, for demonstrative purposes only.

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Data Brief

Key Features

  • Low-cost solution for spark-free thermostats:
  • No need for a sealed version
  • Low-cost STM8S microcontroller for thermostat control
  • Low-cost capacitive power supply
  • High efficiency:
  • Refrigerator consumption reduction by adjusting and reducing the hysteresis threshold of the temperature
  • Improved efficiency by turning on the defrost resistor only when it's useful and not at each OFF cycle of the compressor (as done in some mechanical thermostats)
  • High system immunity:
  • Overvoltage protected ACS switches: ACST610-8FP for compressor control, ACS110-7SN for defrost resistor and ACS102-6TA for light bulb and fan
  • Class A criteria for IEC 61000-4-4 up to above 3 kV levels
  • Flexibility:
  • Development: program setting with PC interface to change firmware variables
  • Industrialization: end-of-production MCU programming thanks to FLASH, for soft upgrade and efficient MCU stock management
  • RoHS compliant

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Design Resources

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Technical Documentation

Product Specifications

Description Version Size
pdf
DB1651: Cold thermostat kit based on AC switches and the STM8S
3.0 142 KB

User Manual

Description Version Size
pdf
UM1542: Cold thermostat kit based on AC switches and the STM8S003F3
1.0 2,942 KB

Hardware Resources

Board Manufacturing Specification

Description Version Size
zip
STEVAL-IHT001V2 gerber files
1.0.0 287 KB

Bill of Materials

Description Version Size
pdf
STEVAL-IHT001V2 BOM
2.0.0 51 KB

Schematic Pack

Description Version Size
pdf
STEVAL-IHT001V2 schematics
2.0.0 123 KB

Related Tools and Software

Related Tools and Software

Part Number Description
STSW-IHT001V2 STEVAL-IHT001V2 thermostat setup

Publications and Collaterals

Magazine

Description Version Size
pdf
NEW ELECTRONIC THERMOSTAT SOLUTION
395 KB

License Agreement

Description Version Size
pdf
Evaluation products license agreement
1.0 126 KB

Sample & Buy

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Part Number Marketing StatusCore ProductOrder From STUnit Price (US$)*
@ 1
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STEVAL-IHT001V2ActiveACST610; ACS110; ACS102; STM32F103C6; STM8S103F3-221Distributor reported inventory date: 2014-12-22
Distributor NameRegionStockMin. order
Newark Element14Order NowAMERICA50
Farnell Element14Order NowEUROPE51
Ecopack2-

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
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