ST72101 Microcontroller Technical Summary

Overview

The ST72101 is a member of the ST7 family of 8-bit HCMOS microcontrollers from STMicroelectronics. It features a high-performance core with enhanced instruction set, on-chip peripherals, and flexible memory options. The device is designed for embedded control applications requiring robust performance and low-power operation.

The microcontroller combines a powerful CPU core with various integrated peripherals including I/O ports, timers, serial communication interfaces, and analog-to-digital conversion capabilities. Its architecture is optimized for both performance and power efficiency, making it suitable for a wide range of industrial and consumer applications.

Key Features

Core Features

• 8-bit ST7 core with enhanced instruction set
• Up to 8MHz operating frequency
• Multiple addressing modes for efficient programming
• 16-bit timer with capture/compare capabilities
• Watchdog timer for system reliability

Memory Configuration

• 4K or 8K bytes of program memory (model dependent)
• 256 bytes of RAM (including 64 bytes stack)
• Memory-mapped I/O registers

Peripheral Features

• Multiple bidirectional I/O ports with configurable options
• 16-bit timer with multiple operating modes
• 8-bit ADC with multiple input channels
• Serial Peripheral Interface (SPI) for communication
• Watchdog timer with independent clock source

Power Management

• Multiple low-power modes: Slow, Wait, and Halt
• Flexible clock control system
• Power-on reset and brown-out detection

Applications

The ST72101 microcontroller is suitable for a wide range of applications including:

• Industrial control systems
• Consumer electronics
• Automotive subsystems
• Home appliances
• Sensor interfaces and data acquisition
• Motor control systems
• Power management systems

Electrical Characteristics

Absolute Maximum Ratings

• Supply voltage: -0.3V to +6.5V
• Input voltage on any pin: -0.3V to VDD+0.3V
• Operating temperature range: -40°C to +85°C
• Storage temperature range: -65°C to +150°C

Recommended Operating Conditions

• Supply voltage: 3.0V to 5.5V
• Operating temperature: -40°C to +85°C
• Clock frequency: Up to 8MHz (dependent on supply voltage)

DC Characteristics

• Input low voltage: 0.3VDD max
• Input high voltage: 0.7VDD min
• Output low voltage: 0.4V max (IOL = 10mA)
• Output high voltage: VDD-0.4V min (IOH = -10mA)
• Power supply current: 5mA typical at 8MHz, 5V

Clock Characteristics

• External clock input frequency: 1MHz to 8MHz
• Internal RC oscillator accuracy: ±5% at 25°C
• Start-up time from power-down: 10ms typical

A/D Converter Characteristics

• 8-bit resolution
• Conversion time: 10µs typical
• Analog input voltage range: 0V to VDD
• Integral nonlinearity: ±1 LSB
• Differential nonlinearity: ±0.5 LSB

Package Information

Available Packages

• DIP (Dual In-line Package) - 28 pins
• SOIC (Small Outline IC) - 28 pins
• SSOP (Shrink Small Outline Package) - 28 pins

Package Dimensions

For 28-pin DIP package:

• Package width: 15.24mm
• Package length: 36.32mm
• Lead pitch: 2.54mm
• Body thickness: 4.57mm

For 28-pin SOIC package:

• Package width: 7.5mm
• Package length: 17.9mm
• Lead pitch: 1.27mm
• Body thickness: 2.35mm

Peripheral Details

I/O Ports

The ST72101 features multiple bidirectional I/O ports with the following capabilities:

• Individually configurable as input or output
• Programmable pull-up resistors
• High current drive capability
• Schmitt trigger inputs on selected pins

16-bit Timer

The advanced 16-bit timer offers:

• Input capture mode
• Output compare mode
• PWM generation capability
• Timer overflow interrupt
• Programmable prescaler

Serial Peripheral Interface (SPI)

The SPI interface provides:

• Full-duplex synchronous transfer
• Master or slave operation
• Programmable clock polarity and phase
• 8-bit or 16-bit data transfer
• Interrupt capability

Watchdog Timer

The independent watchdog timer features:

• Separate clock source
• Programmable timeout period
• Windowed operation option
• Reset or interrupt generation

Development Support

The ST72101 is supported by a comprehensive development ecosystem including:

• Assemblers and C compilers
• In-circuit debuggers and emulators
• Evaluation boards
• Application notes and reference designs