STEVAL-IHT001V2

Cold thermostat kit based on AC switches and the STM8S

Quick View Resources

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.

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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Resources

Technical Documentation

Product Specifications

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

User Manuals

	Description	Version	Size
	UM1542: Cold thermostat kit based on AC switches and the STM8S003F3	1.0	2 MB

Hardware Resources

Board Manufacturing Specifications

	Description	Version	Size
	STEVAL-IHT001V2 gerber files	1.0	286 KB

Bill of Materials

	Description	Version	Size
	STEVAL-IHT001V2 BOM	1.1	51 KB

Schematic Pack

	Description	Version	Size
	STEVAL-IHT001V2 schematics	1.1	122 KB

Legal

License Agreement

	Description	Version	Size
	Evaluation products license agreement	1.4	128 KB

Tools and Software

Embedded Software

Evaluation Tool Software

Part Number	Manufacturer	Description
STSW-IHT001V2	ST	STEVAL-IHT001V2 thermostat setup

Sample & Buy

Part Number	Core Product	Marketing Status	Unit Price (US$) *	Quantity	ECCN (US)	Country of Origin	More info	Order from ST	Order from Distributors
STEVAL-IHT001V2	ACST610; ACS110; ACS102; STM32F103C6; STM8S103F3	Active : Product is in volume production	221.0	1	3A991A2	ITALY	MORE INFO	Buy Direct Add to cart	DISTRIBUTOR AVAILABILITY

(*) 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

Quality & Reliability

Part Number	Marketing Status	Package	Grade	RoHS Compliance Grade	WEEE Compliant	Material Declaration**
STEVAL-IHT001V2	Active	CARD	Industrial	Ecopack2	-

(**) 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.