ST ST7Lite39 冰箱控制解决方案
ST 公司的ST7LITE3xF2 是8位ST7 MCU系列 ，具有单电压的闪存，数据EEPROM, ADC，计时器，SPI和 LINSCI等组合性能。器件具有片上调试模块(DM)，以支持在电路中调试（ICD)，因此可用家用电器的控制。 本文详细介绍了ST7LITE3xF2系列的性能和方框图，以及基于ST7Lite39的冰箱恒温控制板的性能，电路图和所用材料清单。
ST7LITE3xF2 8-bit MCU with single voltage Flash, data EEPROM, ADC, timers,
SPI, LINSCI
The ST7LITE3 is a member of the ST7 microcontroller family. All ST7 devices are based on a common industry-standard 8-bit core, featuring an enhanced instruction set.
The ST7LITE3 features FLASH memory with byte-by-byte In-Circuit Programming (ICP) and In-Application Programming (IAP) capability.
Under software control, the ST7LITE3 device can be placed in WAIT, SLOW, or HALT mode, reducing power consumption when the application is in idle or standby state.
The enhanced instruction set and addressing modes of the ST7 offer both power and flexibility to software developers, enabling the design of highly efficient and compact application code. In addition to standard 8-bit data management, all ST7 microcontrollers
feature true bit manipulation, 8x8 unsigned multiplication and indirect addressing modes.
The devices feature an on-chip Debug Module (DM) to support in-circuit debugging (ICD). For a description of the DM registers, refer to the ST7 ICC Protocol Reference Manual.
主要性能：
■ Memories
8 Kbytes program memory: single voltage extended Flash (XFlash) Program memory with read-out protection, In-Circuit Programming and In-Application programming (ICP and IAP), data retention: 20 years at 55°C.
384 bytes RAM
256 bytes data EEPROM with read-out protection. 300K write/erase cycles guaranteed,
data retention: 20 years at 55°C.
■ Clock, Reset and Supply Management
Enhanced reset system
Enhanced low voltage supervisor (LVD) for main supply and an auxiliary voltage detector (AVD) with interrupt capability for implementing safe power-down procedures
Clock sources: Internal RC 1% oscillator, crystal/ceramic resonator or external clock
Optional x4 or x8 PLL for 4 or 8 MHz internal clock
Five Power Saving Modes: Halt, Active-Halt, Wait and Slow, Auto Wake Up From Halt
■ I/O Ports
Up to 15 multifunctional bidirectional I/O lines
7 high sink outputs
■ 5 Timers
Configurable Watchdog Timer
Two 8-bit Lite Timers with prescaler,
1 realtime base and 1 input capture
Two 12-bit Auto-reload Timers with 4 PWM outputs, input capture and output compare
functions
■ 2 Communication Interfaces
Master/slave LINSCI™ asynchronous serial interface
SPI synchronous serial interface
■ Interrupt Management
10 interrupt vectors plus TRAP and RESET
12 external interrupt lines (on 4 vectors)
■ A/D Converter
7 input channels
10-bit resolution
■ Instruction Set
8-bit data manipulation
63 basic instructions with illegal opcode detection
17 main addressing modes
8 x 8 unsigned multiply instructions
■ Development Tools
Full hardware/software development package
DM (Debug module)
Device summary
图1 ST7Lite39方框图
基于ST7Lite39的冰箱恒温控制板STEVAL-IHT001V1
STEVAL-IHT001V1 Thermostat Control Board for Refrigerator based on ST7Lite39
Features and Description
Compressor/defrost control
Temperature control
Light bulb control
User-friendly GUI
Energy-saving
Safety and EMC standards compliance
The STEVAL-IHT001V1 Thermostat Kit is designed for refrigerator or freezer thermostat control. This evaluation kit enables the control of a single-phase induction motor, a light bulb and a defrost resistor (or fan) working on a 230 VRMS 50/60 Hz mains voltage.
The board can operate within an ambient temperature range of 0 to 40 °C. The precise maximum temperature depends on the power of the loads.
The kit also includes a GUI (graphical user interface) for sending commands to the ST7LITE39F2 microcontroller or to access MCU information via the serial communication interface (SCI). This enables users to easily change the MCU software parameters and acquire measurements during appliance testing.
图2 冰箱恒温控制板外形图
图3 冰箱恒温控制板电路图
下表为冰箱恒温控制板材料清单：
