ST72752 Microcontroller Technical Summary

Overview

The ST72752 is a high-performance HCMOS microcontroller unit (MCU) from the ST7 family, designed for embedded control applications. This 8-bit microcontroller combines advanced processing capabilities with dedicated peripherals, making it suitable for a wide range of industrial, consumer, and automotive applications. The device is available in multiple memory configurations to accommodate different application requirements.

Built using high-density CMOS technology, the ST72752 offers an optimal balance of performance, power consumption, and cost-effectiveness. Its enhanced architecture includes an advanced instruction set and efficient memory organization, enabling rapid development of sophisticated control algorithms.

Key Features

Core Architecture

• 8-bit ST7 core with enhanced instruction set
• Up to 32K bytes of ROM (program memory)
• Up to 1K bytes of RAM (data memory)
• 16-bit stack pointer for efficient subroutine handling
• 63 basic instructions with 11 addressing modes

Memory Variants

• ST72752J6: 32K ROM, 1K RAM
• ST72752J5: 24K ROM, 768 bytes RAM
• ST72752J4: 16K ROM, 512 bytes RAM

Peripheral Features

• 4-channel 8-bit Analog-to-Digital Converter (ADC)
• One 16-bit timer with input capture/output compare
• I²C bus interface for serial communication
• Multiple I/O ports with programmable options
• Watchdog timer for system reliability

Applications

The ST72752 microcontroller is designed for a broad spectrum of embedded control applications, including:

• Industrial Control Systems: Process control, motor control, and sensor interfaces
• Consumer Electronics: Home appliances, remote controls, and smart devices
• Automotive Systems: Body electronics, climate control, and basic engine management
• Medical Devices: Portable monitoring equipment and diagnostic tools
• Security Systems: Access control and alarm systems

The device's robust peripheral set and memory options make it particularly suitable for applications requiring analog signal acquisition, timing functions, and serial communication.

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (V_DD): -0.3V to +6.0V
• Input Voltage on any pin: -0.3V to V_DD+0.3V
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -55°C to +150°C

Recommended Operating Conditions

• Supply Voltage (V_DD): 4.5V to 5.5V
• Operating Frequency: DC to 8MHz
• Ambient Temperature: -40°C to +85°C

Power Consumption

• Active Mode @ 8MHz: 10mA typical
• Wait Mode: 2mA typical
• Halt Mode: 50μA typical

ADC Characteristics

• Resolution: 8 bits
• Conversion Time: 20μs typical
• Input Voltage Range: 0V to V_DD
• Integral Nonlinearity: ±1 LSB

Package Information

The ST72752 is available in multiple package options to suit various application requirements:

DIP-28 Package

• 28-pin Dual In-line Package
• Dimensions: 36.0mm x 13.0mm (including leads)
• Lead pitch: 2.54mm
• Through-hole mounting
• Ideal for prototyping and development

SO-28 Package

• 28-pin Small Outline Package
• Dimensions: 17.9mm x 7.5mm (body)
• Lead pitch: 1.27mm
• Surface mount technology
• Suitable for space-constrained applications

Pin Configuration

The microcontroller features a comprehensive pinout with multiple functions assigned to each pin, including:

• Power supply pins (V_DD, V_SS)
• Reset input
• Clock input/output
• General purpose I/O ports
• Analog input channels
• Timer and communication interface pins

Development Support

STMicroelectronics provides comprehensive development support for the ST72752 microcontroller, including:

• ST7 development tools and software libraries
• In-circuit emulators and debuggers
• C compilers and assemblers
• Application notes and reference designs
• Evaluation boards for rapid prototyping

Conclusion

The ST72752 microcontroller represents a versatile solution for embedded control applications, offering a balanced combination of processing power, peripheral integration, and memory options. Its robust architecture, coupled with comprehensive development support, makes it an excellent choice for designers seeking reliable performance in cost-sensitive applications. The availability of multiple memory variants and package options further enhances its flexibility across diverse application scenarios.