STMicroelectronics' new STM8S family of 8-bit microcontrollers combines
leading-edge performance, robustness, peripherals, and cost
effectiveness. These high-performance MCUs
feature an advanced 20MIP STM8 8-bit core with Harvard Architecture and
3-stage Pipeline, robust architecture (dual watchdogs, clock security,
and IEC61967-compliant EMI emission), a rich peripheral set (10-bit ADC,
advanced timers, CAN, UARTs, SPI, I2C), and maximum integration (true
EEPROM, 16 MHz and 128 KHz on-chip RC oscillators). The STMicroelectronics STM8S family
meets the demanding requirements of industrial and
appliance applications while providing a host of other benefits,
including excellent performance and code density, scalability in memory,
and reduced system cost and external component needs. STM8S MCUs
are good for accurate control, monitoring, and communication and are
suitable for high-performance and cost-sensitive general purpose 8-bit MCU applications.
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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 120/230 VRMS, 50/60 Hz mains voltage. 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.