87C652 - 8-Bit Microcontroller

Overview

The 87C652 is a high-performance, single-chip 8-bit microcontroller based on the 80C51 architecture. It is designed for embedded control applications requiring robust processing capabilities, flexible memory expansion, and versatile I/O options. The microcontroller integrates an 8K × 8 EPROM, 256 × 8 RAM, and multiple peripheral interfaces, making it suitable for a wide range of industrial, automotive, and consumer electronics applications.

Features

The 87C652 offers a comprehensive set of features that enhance its functionality and ease of integration into embedded systems:

• 80C51 Central Processing Unit (CPU): Provides efficient 8-bit processing with a rich instruction set, ensuring compatibility with existing 80C51-based designs.
• On-Chip Memory:
  • 8K × 8 EPROM for program storage (not expandable beyond 8K).
  • 256 × 8 RAM for data storage, expandable externally up to 64K bytes.
• Timer/Counters: Two standard 16-bit timer/counters for precise timing, event counting, and pulse generation.
• I/O Ports: Four 8-bit bidirectional I/O ports for interfacing with external peripherals, sensors, and actuators.
• I2C-Bus Serial Interface: A byte-oriented I2C-bus serial I/O port for communication with I2C-compatible devices, enabling efficient data transfer in multi-device systems.

Applications

The 87C652 is well-suited for a variety of embedded control applications, including but not limited to:

• Industrial Automation: Process control, motor control, and monitoring systems.
• Automotive Electronics: Engine management, dashboard displays, and sensor interfacing.
• Consumer Electronics: Home appliances, remote controls, and smart devices.
• Communication Systems: Modems, serial communication modules, and peripheral controllers.
• Medical Devices: Portable diagnostic equipment and patient monitoring systems.

Electrical Characteristics

The 87C652 operates under the following electrical specifications:

Absolute Maximum Ratings

• Supply Voltage (V_CC): -0.5V to +7.0V
• Input Voltage (V_IN): -0.5V to V_CC + 0.5V
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage (V_CC): 4.5V to 5.5V
• Clock Frequency: Up to 12 MHz
• I/O Port Current (per pin): ±10 mA

Power Consumption

• Active Mode: Typically 25 mA at 12 MHz
• Idle Mode: Typically 5 mA at 12 MHz
• Power-Down Mode: Typically 50 µA

Package Information

The 87C652 is available in multiple package options to accommodate different design requirements:

40-Pin Dual Inline Package (DIP)

• Package Dimensions: 52.32 mm × 13.97 mm × 4.44 mm
• Pin Pitch: 2.54 mm
• Material: Plastic (PDIP)

44-Pin Plastic Leaded Chip Carrier (PLCC)

• Package Dimensions: 16.51 mm × 16.51 mm × 4.06 mm
• Pin Pitch: 1.27 mm
• Material: Plastic (PLCC)

44-Pin Quad Flat Package (QFP)

• Package Dimensions: 10 mm × 10 mm × 1.4 mm
• Pin Pitch: 0.8 mm
• Material: Plastic (PQFP)

Conclusion

The 87C652 is a versatile and reliable 8-bit microcontroller that combines the proven 80C51 architecture with advanced features such as I2C-bus communication and expandable memory. Its robust electrical characteristics and flexible packaging options make it an ideal choice for a wide range of embedded control applications. Whether used in industrial automation, automotive systems, or consumer electronics, the 87C652 delivers performance, efficiency, and ease of integration.