ST72751 Microcontroller Technical Summary

Overview

The ST72751 is a high-performance HCMOS microcontroller unit (MCU) from the ST7 family, designed for embedded applications requiring robust processing capabilities and versatile peripheral integration. This MCU is part of STMicroelectronics' ST7 series, known for its reliability and efficiency in industrial, automotive, and consumer applications. The ST72751 offers a balance of memory, processing power, and peripheral options, making it suitable for a wide range of embedded control tasks.

Key Features

• Core Architecture: 8-bit ST7 core with enhanced HCMOS technology for low power consumption and high performance.
• Memory Options: Multiple variants available with different ROM and RAM configurations (see variants below).
• Analog-to-Digital Converter (ADC): 8-channel ADC for precise analog signal acquisition.
• Timers: Integrated timer module for PWM generation, event counting, and time-based operations.
• Communication Interfaces: Built-in I2C bus for serial communication with peripherals and other devices.
• Operating Voltage: Designed for a wide voltage range, typically 3.0V to 5.5V, ensuring compatibility with various power supplies.
• Temperature Range: Industrial-grade operating temperature range for reliable performance in harsh environments.

Variants

The ST72751 is available in multiple configurations to suit different application requirements:

• ST72751N9: 60KB ROM, 2KB RAM
• ST72751N7: 48KB ROM, 1.5KB RAM
• ST72751N6: 32KB ROM, 1KB RAM

Applications

The ST72751 microcontroller is well-suited for a variety of embedded applications, including but not limited to:

• Industrial Control Systems: Motor control, sensor interfacing, and automation tasks.
• Automotive Electronics: Body control modules, dashboard instrumentation, and lighting systems.
• Consumer Electronics: Home appliances, remote controls, and portable devices.
• Medical Devices: Patient monitoring systems and portable diagnostic equipment.
• IoT and Smart Devices: Low-power sensor nodes and edge computing applications.

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (VDD): -0.3V to 6.5V
• Input Voltage (VIN): -0.3V to VDD + 0.3V
• Operating Temperature Range: -40°C to +85°C (industrial)
• Storage Temperature Range: -55°C to +150°C

Recommended Operating Conditions

• Supply Voltage (VDD): 3.0V to 5.5V
• Operating Frequency: Up to 8MHz (dependent on voltage)
• ADC Reference Voltage: 2.4V to VDD

Power Consumption

• Active Mode (8MHz, 5V): Typical 10mA
• Wait Mode: Typical 2mA
• Halt Mode: Typical 10µA

Peripheral Details

Analog-to-Digital Converter (ADC)

• 8-channel, 10-bit resolution
• Conversion time: 10µs at 8MHz
• Programmable reference voltage
• Single or continuous conversion modes

Timer Module

• 16-bit auto-reload timer/counter
• PWM generation capability
• Input capture and output compare functions
• Clock prescaler with multiple division ratios

I2C Interface

• Standard (100kHz) and Fast (400kHz) modes
• 7-bit and 10-bit addressing
• Multi-master capability
• Clock stretching support

Package Information

The ST72751 is available in multiple package options to accommodate different PCB layout and space requirements:

• DIP-40: 40-pin Dual In-line Package (through-hole)
• LQFP-44: 44-pin Low-profile Quad Flat Package (surface mount)
• SO-28: 28-pin Small Outline Package (space-constrained applications)

Package Dimensions (LQFP-44 Example)

• Body size: 10mm × 10mm
• Height: 1.4mm (max)
• Lead pitch: 0.8mm
• Lead count: 44

Development Support

STMicroelectronics provides comprehensive development support for the ST72751 microcontroller:

• Development Tools: ST7 family development kits and programmers
• Software: ST7 Toolset including assembler, linker, and debugger
• Application Notes: Detailed technical documentation for various use cases
• Reference Designs: Example implementations for common applications

Conclusion

The ST72751 microcontroller from STMicroelectronics offers a compelling combination of processing power, memory options, and peripheral integration for embedded system designers. With its robust architecture, versatile I/O capabilities, and multiple package options, it provides an excellent solution for a wide range of applications across industrial, automotive, and consumer markets. The availability of different memory configurations allows designers to select the optimal variant for their specific requirements while maintaining code compatibility across the product family.