ST72372 8-Bit Microcontroller Technical Summary

Overview

The ST72372 is an 8-bit HCMOS microcontroller unit (MCU) from STMicroelectronics' ST7 family. This device combines high performance with low power consumption and enhanced peripheral integration, making it suitable for a wide range of embedded control applications. The microcontroller features a robust CPU core, multiple communication interfaces, analog peripherals, and flexible power management modes.

Key attributes include 16KB of program memory, 512 bytes of RAM, multiple timer modules, I²C and SCI communication interfaces, PWM generation, and an 8-bit ADC. The device operates within a 4.0V to 5.5V supply range with a maximum CPU frequency of 8MHz (achievable with a 24MHz quartz crystal).

Features

Core Features

• 8-bit ST7 CPU core with 16-bit addressing
• Up to 8MHz operating frequency
• 16KB program memory
• 512 bytes RAM (256 bytes stack)
• 77 instructions with 6 addressing modes
• Nested interrupt controller

Peripheral Features

• 30 I/O pins with programmable options
• 16-bit timer with multiple operating modes
• I²C multimaster interface
• Serial Communications Interface (SCI)
• 4-channel 10-bit PWM/BRM generator
• 8-bit ADC with 4 input channels
• Watchdog timer

Power Management

• Three low-power modes: Slow, Wait, and Halt
• 4.0V to 5.5V operating voltage range
• Power-on reset and brown-out detection

Applications

The ST72372 is designed for embedded control applications across multiple industries:

• Industrial control systems
• Consumer electronics
• Automotive body electronics
• Home appliances
• Sensor interfaces
• Motor control systems
• Power management systems

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (VDD): -0.3V to +7.0V
• Input Voltage on any pin: -0.3V to VDD+0.3V
• Operating Temperature Range: 0°C to +70°C
• Storage Temperature Range: -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: 0 to 8MHz
• Crystal Frequency: Up to 24MHz

DC Characteristics

• Power Supply Current (Run mode @ 8MHz): 15mA typical
• Power Supply Current (Wait mode): 5mA typical
• Power Supply Current (Halt mode): 50μA typical
• Input High Voltage: 0.7VDD min
• Input Low Voltage: 0.3VDD max

A/D Converter Characteristics

• 8-bit resolution
• 4 analog input channels
• Conversion time: 20μs typical
• Integral Nonlinearity: ±1 LSB
• Differential Nonlinearity: ±1 LSB

PWM Characteristics

• 10-bit resolution
• 4 PWM channels
• Programmable frequency and duty cycle
• Frequency range: 61Hz to 125kHz

Package Information

The ST72372 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, windowed)
• 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)

Package Dimensions

• SDIP42: 15.24mm x 6.35mm body, 1.778mm lead pitch
• SDIP56: 22.86mm x 7.62mm body, 1.778mm lead pitch
• TQFP64: 10mm x 10mm body, 0.5mm lead pitch

Memory Organization

Memory Map

• 0000h-3FFFh: 16KB Program Memory
• 0080h-00FFh: 128 bytes RAM
• 0100h-01FFh: 256 bytes Stack
• FFC0h-FFFFh: Peripheral and I/O registers

Clock, Reset, and Power Management

Clock System

• Internal RC oscillator or external crystal
• Clock divider for power saving
• External clock input capability

Reset System

• Power-on reset
• External reset pin
• Watchdog reset
• Low-voltage detection

Power Saving Modes

• Slow Mode: Reduced clock frequency operation
• Wait Mode: CPU halted, peripherals active
• Halt Mode: Minimum power consumption, wake-up via interrupt

Development Support

The ST72372 is supported by a comprehensive development ecosystem:

• ST7 family development tools
• In-circuit emulators
• C compilers and assemblers
• Evaluation boards
• Programming tools for EPROM versions