ST72371

ST72371 Microcontroller Technical Summary

Overview

The ST72371 is an 8-bit HCMOS microcontroller unit (MCU) from STMicroelectronics, belonging to the ST7 family. It is designed for embedded control applications requiring robust performance, low power consumption, and rich peripheral integration. The device operates within a 4.0V to 5.5V supply range and can achieve a maximum CPU frequency of 8MHz (using a 24MHz quartz oscillator).

Key features include integrated program memory, RAM, multiple I/O ports, analog-to-digital conversion, PWM generation, and serial communication interfaces. The ST72371 is particularly suited for industrial control, automotive systems, and consumer electronics applications.

Features

• Core: 8-bit ST7 CPU with 8MHz maximum frequency
• Memory:
  • 16KB Program Memory (ROM)
  • 512 bytes RAM (256 bytes stack)
• Analog Peripherals:
  • 8-bit A/D Converter with 8 channels
  • 10-bit D/A Converter (4 channels)
  • 12-bit D/A Converter (1 channel)
• Timers:
  • 16-bit Timer with multiple functions
  • Watchdog Timer
• Communication Interfaces:
  • I²C Bus Interface (multimaster capable)
  • Serial Communications Interface (SCI)
• I/O Ports: Up to 39 I/O pins (depending on package)
• Power Management: Multiple power saving modes (Slow, Wait, Halt)
• Operating Conditions:
  • Voltage: 4.0V to 5.5V
  • Temperature: 0°C to +70°C

Applications

The ST72371 microcontroller is suitable for a wide range of applications including:

• Industrial control systems
• Automotive electronics
• Consumer appliances
• Motor control systems
• Sensor interfaces
• Power management systems
• Embedded control applications

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage: -0.3V to +6.5V
• Input Voltage: -0.3V to V_DD + 0.3V
• Storage Temperature: -55°C to +150°C

Recommended Operating Conditions

• Operating Voltage: 4.0V to 5.5V
• Operating Temperature: 0°C to +70°C
• CPU Clock Frequency: Up to 8MHz

DC Characteristics

• Input High Voltage: 0.7V_DD (min)
• Input Low Voltage: 0.3V_DD (max)
• Output High Voltage: V_DD - 1V (min)
• Output Low Voltage: 0.4V (max)

A/D Converter Characteristics

• Resolution: 8 bits
• Conversion Time: Typically 10µs
• Input Voltage Range: 0V to V_DD
• Integral Nonlinearity: ±1 LSB

PWM Characteristics

• Resolution: 10-bit and 12-bit options
• Frequency Range: Programmable
• Duty Cycle: 0% to 100%

I²C Characteristics

• Compliant with I²C bus specification
• Multimaster capability
• Standard (100kHz) and Fast (400kHz) modes

Package Information

The ST72371 is available in multiple package options:

• SDIP42 (Shrink Dual In-line Package, 42 pins)
• PSDIP42 (Plastic Shrink Dual In-line Package, 42 pins)
• CSDIP42W (Ceramic Shrink Dual In-line Package, 42 pins, wide)
• SDIP56 (Shrink Dual In-line Package, 56 pins)
• PSDIP56 (Plastic Shrink Dual In-line Package, 56 pins)
• CSDIP56 (Ceramic Shrink Dual In-line Package, 56 pins)
• TQFP64 (Thin Quad Flat Package, 64 pins)

Memory Map

The ST72371 features a well-organized memory architecture:

• Program Memory: 16KB ROM mapped from 0x8000 to 0xBFFF
• RAM: 512 bytes (including 256 bytes stack) mapped from 0x0000 to 0x01FF
• Peripheral Registers: Mapped between 0x0000 and 0x07FF
• EEPROM: Not available on this model

Clock System

The microcontroller features a flexible clock system:

• External clock input capability
• Internal clock divider for power management
• Supports multiple clock sources:
  • Crystal oscillator
  • External clock signal
  • Internal RC oscillator (when available)

Power Saving Modes

The ST72371 includes several power-saving features:

• Slow Mode: Reduces clock frequency to lower power consumption
• Wait Mode: CPU halted while peripherals remain active
• Halt Mode: Lowest power state with all clocks stopped

Development Support

STMicroelectronics provides comprehensive development support for the ST72371:

• Development tools and IDEs
• Evaluation boards
• Application notes and reference designs
• Programming and debugging interfaces