AT89S8252 - 8-bit Microcontroller with Flash and EEPROM

Overview

The AT89S8252 is a low-power, high-performance CMOS 8-bit microcontroller from Atmel, featuring 8KB of downloadable Flash programmable memory and 2KB of EEPROM. Manufactured using Atmel's high-density nonvolatile memory technology, this device maintains full compatibility with the industry-standard 80C51 instruction set and pinout configuration. The on-chip Flash memory supports in-system reprogramming via SPI serial interface or conventional non-volatile memory programmers, making it an exceptionally flexible solution for embedded control applications.

This microcontroller combines an efficient 8-bit CPU with significant onboard memory resources, offering designers a cost-effective platform for a wide range of embedded systems. The inclusion of both Flash and EEPROM memory types provides developers with optimal flexibility for program storage and data retention requirements.

Features

• MCS-51 Compatibility: Fully compatible with industry-standard MCS-51 products
• Memory Configuration:
  • 8KB In-System Reprogrammable Downloadable Flash Memory
    • SPI Serial Interface for program downloading
    • Endurance: 1,000 write/erase cycles
  • 2KB EEPROM
    • Endurance: 100,000 write/erase cycles
  • 256 x 8-bit Internal RAM
• Performance Characteristics:
  • 4.0V to 6V operating range
  • Fully static operation: 0 Hz to 24 MHz
  • Three-level program memory lock
• I/O Capabilities:
  • 32 programmable I/O lines
• Timing Resources:
  • Three 16-bit timer/counters
  • Programmable watchdog timer
• Communication Interfaces:
  • Programmable UART serial channel
  • SPI serial interface
• Power Management:
  • Low power idle and power down modes
  • Interrupt recovery from power down
  • Power off flag
• Advanced Features:
  • Nine interrupt sources
  • Dual data pointer

Applications

The AT89S8252 is particularly well-suited for a wide range of embedded control applications, including:

• Industrial Control Systems: Process control, automation equipment, and monitoring systems
• Consumer Electronics: Smart appliances, home automation, and entertainment systems
• Automotive Systems: Body electronics, simple control modules, and sensor interfaces
• Medical Devices: Portable monitoring equipment and diagnostic tools
• Communication Devices: Modems, network interfaces, and protocol converters
• Security Systems: Access control, alarm systems, and surveillance equipment
• Measurement Instruments: Data loggers, portable meters, and test equipment

The combination of reprogrammable Flash memory and EEPROM makes this microcontroller especially valuable for applications requiring field updates or data storage capabilities.

Electrical Characteristics

Absolute Maximum Ratings

• Operating Temperature: -40°C to +85°C
• Storage Temperature: -65°C to +150°C
• Voltage on Any Pin Relative to Ground: -0.5V to Vcc+0.5V
• Maximum Operating Voltage: 6.6V
• DC Current per I/O Pin: 15mA
• DC Current for Vcc and GND Pins: 100mA

DC Characteristics

• Power Supply Voltage (Vcc): 4.0V to 6.0V
• Input Low Voltage (Vil): -0.5V to 0.2Vcc-0.1V
• Input High Voltage (Vih): 0.2Vcc+0.9V to Vcc+0.5V
• Output Low Voltage (Vol): 0.45V max (Iol = 1.6mA)
• Output High Voltage (Voh): Vcc-0.7V min (Ioh = -60μA)

Power Consumption

• Active Mode (12MHz): 15mA typical
• Idle Mode (12MHz): 6mA typical
• Power Down Mode: 50μA typical

Package Information

The AT89S8252 is available in multiple package options to suit various application requirements:

40-lead PDIP (Plastic Dual In-line Package)

• Package Dimensions: 52.32mm x 13.97mm
• Lead Pitch: 2.54mm
• Operating Temperature: -40°C to +85°C

44-lead PLCC (Plastic Leaded Chip Carrier)

• Package Dimensions: 16.66mm x 16.66mm
• Lead Pitch: 1.27mm
• Operating Temperature: -40°C to +85°C

44-lead TQFP (Thin Quad Flat Package)

• Package Dimensions: 10mm x 10mm
• Lead Pitch: 0.8mm
• Operating Temperature: -40°C to +85°C

Development Support

The AT89S8252 is supported by a comprehensive development ecosystem:

• Development Tools: Compatible with standard 8051 development environments
• Programmers: Supports SPI-based in-system programming and conventional parallel programmers
• Debugging: Available through third-party emulators and debuggers
• Software Libraries: Extensive code libraries available for peripheral control and common functions

Conclusion

The AT89S8252 represents a powerful and flexible 8-bit microcontroller solution that combines the reliability of industry-standard 8051 architecture with advanced memory features. Its combination of Flash program memory and EEPROM data memory, along with robust peripheral set and power management capabilities, make it an excellent choice for a wide range of embedded applications. The device's in-system programmability via SPI interface significantly enhances development flexibility and enables field updates, while its low-power modes extend battery life in portable applications.

With its comprehensive feature set, proven architecture, and Atmel's quality manufacturing, the AT89S8252 offers designers a reliable and cost-effective solution for demanding embedded control applications.