28AC100

28AC100 Technical Summary

Overview

The 28AC100 is a high-performance microcontroller belonging to the SX family, designed for applications requiring fast processing speeds and efficient power management. With a 28-pin SSOP (Shrink Small Outline Package) configuration, this component integrates a robust architecture capable of delivering up to 100 MIPS (Million Instructions Per Second) at a 100 MHz oscillator frequency. Its versatile I/O capabilities and integrated peripherals make it suitable for a wide range of embedded applications.

Features

• High-Speed Performance: Capable of 100 MIPS execution at 100 MHz oscillator frequency (28AC100 variant).
• Flexible Clocking Options: Supports external oscillator inputs (OSC1/OSC2) for precise timing control.
• Rich I/O Ports: Multiple bidirectional I/O pins (RA0-RA3, RB0-RB7, RC0-RC7) for interfacing with external devices.
• Integrated Peripherals: Includes features such as RTCC (Real-Time Clock and Calendar) for timekeeping applications.
• Low-Power Modes: Supports power-saving modes to optimize energy consumption in battery-operated systems.
• Reset and Interrupt Control: Features MCLR (Master Clear Reset) for system initialization and interrupt handling.
• Compact Package: 28-pin SSOP package for space-constrained designs.

Applications

The 28AC100 is well-suited for a variety of embedded and real-time applications, including:

• Industrial Automation: Motor control, sensor interfacing, and process monitoring.
• Consumer Electronics: Remote controls, smart home devices, and portable gadgets.
• Automotive Systems: Dashboard controls, lighting systems, and basic ECU functions.
• Communication Devices: Modems, routers, and peripheral controllers.
• Medical Equipment: Portable diagnostic tools and patient monitoring systems.

Electrical Characteristics

The following table summarizes key electrical specifications for the 28AC100:

• Operating Voltage: 3.0V to 5.5V (typical range for full functionality).
• Maximum Clock Frequency: 100 MHz (for 100 MIPS operation).
• Input/Output Voltage Levels: TTL/CMOS compatible.
• Power Consumption:
  • Active Mode: ~20 mA (typical at 100 MHz).
  • Sleep Mode: <1 μA (with RTCC disabled).
• I/O Pin Current: 25 mA sink/source per pin (maximum).
• Temperature Range: -40°C to +85°C (industrial grade).

Package Information

The 28AC100 is housed in a 28-pin SSOP package with the following mechanical and pinout details:

• Package Type: SSOP-28 (Shrink Small Outline Package).
• Dimensions: 5.3 mm x 10.2 mm (body size).
• Pin Pitch: 0.65 mm (standard for SSOP packages).
• Pin Configuration:
  • Pins 1-8, 16-28: Multiplexed I/O (RA, RB, RC ports), power (Vdd, Vss), and control (MCLR, OSC1/OSC2).
  • Pins 9-15: Additional I/O and peripheral connections (e.g., RTCC, SX).

Pinout Description

The 28AC100's pinout is organized to maximize functionality while maintaining a compact footprint:

• Vdd (Pins 12, 13): Power supply pins (3.0V to 5.5V).
• Vss (Pins 11, 21, 28): Ground connections.
• MCLR (Pin 22): Master Clear Reset (active-low).
• OSC1/OSC2 (Pins 23, 24): External oscillator inputs.
• RA0-RA3 (Pins 17-20): General-purpose I/O or analog inputs.
• RB0-RB7 (Pins 1-8, 15, 16): Bidirectional digital I/O with interrupt capability.
• RC0-RC7 (Pins 25-27, 14, 9, 10, 5-7): Multiplexed I/O for peripherals (UART, SPI, etc.).
• RTCC (Pin 18): Real-Time Clock/Calendar input.

Design Considerations

When integrating the 28AC100 into a design, consider the following:

• Decoupling Capacitors: Place 0.1 μF capacitors near Vdd pins to stabilize power supply.
• Clock Stability: Use a high-quality crystal or resonator for OSC1/OSC2 to ensure timing accuracy.
• I/O Protection: Add series resistors or clamping diodes for pins exposed to external environments.
• Thermal Management: Ensure adequate airflow or heatsinking for high-speed operation.

Conclusion

The 28AC100 microcontroller combines high-speed processing, versatile I/O, and low-power operation in a compact SSOP-28 package. Its robust feature set makes it ideal for demanding embedded applications across industries. Designers should leverage its rich peripheral integration and adhere to recommended layout practices for optimal performance.