AT91M55800A-33CJ

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AT91M55800A-33CJ

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RISC MICROCONTROLLER, 32-BIT, AR

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Description

The AT91M55800A-33CJ is a microcontroller from Microchip (formerly Atmel) based on the ARM7TDMI core, operating at 33 MHz. It features:
- 256 KB Flash and 32 KB SRAM
- On-chip peripherals: USART, SPI, timers, ADC, and PWM
- Low-power modes for energy efficiency
- Industrial-grade (-40°C to +85°C) operation
- 144-pin LQFP package
Designed for embedded applications, it supports real-time control, communication, and mixed-signal processing. Its JTAG interface enables easy debugging and programming.
Key strengths include low power consumption, robust peripheral integration, and ARM architecture compatibility, making it suitable for industrial automation, automotive, and consumer electronics.

Equivalent

The AT91M55800A-33CJ, an older ARM7-based microcontroller from Microchip (formerly Atmel), has limited direct equivalents. However, modern alternatives with similar features include:
- SAM7S series (e.g., SAM7S256) – ARM7TDMI, upgraded peripherals.
- SAM3x/SAM4S series – Cortex-M3/M4, higher performance.
- NXP LPC2100 series – ARM7TDMI, comparable specs.
For legacy designs, consider Microchip's cross-reference tools or sourcing from distributors like Rochester Electronics. Always verify pin/feature compatibility.

Manufacturer

The AT91M55800A-33CJ is manufactured by Microchip Technology Inc. (formerly Atmel Corporation before its acquisition in 2016).
Microchip Technology is a leading semiconductor company specializing in microcontrollers, mixed-signal, analog, and Flash-IP solutions. It serves industries like automotive, industrial, consumer electronics, and IoT with embedded control systems.
The AT91M55800A-33CJ is an ARM7TDMI-based microcontroller, reflecting Atmel’s legacy in ARM-based embedded solutions. Microchip continues to support these products post-acquisition.

Application

The AT91M55800A-33CJ is a microcontroller from Microchip's AT91 ARM-based family, ideal for embedded applications requiring high performance and low power. Key application areas include:
- Industrial Automation: Control systems, PLCs, and motor control.
- Consumer Electronics: Smart devices, home automation, and wearables.
- Automotive: Infotainment, telematics, and body control modules.
- Medical Devices: Portable diagnostic equipment and patient monitoring.
- Communications: Gateways, routers, and IoT edge devices.
Its ARM7TDMI core, integrated peripherals (ADC, PWM, USART), and 3.3V operation make it suitable for real-time, power-efficient designs.

Package

The AT91M55800A-33CJ is packaged in a 132-pin Plastic Quad Flat Pack (PQFP). This surface-mount package has a compact form factor with leads on all four sides, suitable for high-density PCB designs. The "-33CJ" suffix indicates its industrial temperature range (-40°C to +85°C) and commercial-grade quality.

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