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AT91SAM7X256C-AU

ARM7TDMI MCU, 55MHz, 256KB Flash, 64KB SRAM, Ethernet MAC, USB, CAN, LQFP-100

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Manufacturer Part：

AT91SAM7X256C-AU

Package：

LQFP-100

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Description

Product Overview

The AT91SAM7X256C-AU from Microchip Technology is a 32-bit ARM7TDMI-based microcontroller with 256KB Flash, 64KB SRAM, and a rich peripheral set including Ethernet MAC 10/100, USB 2.0 Full Speed, CAN 2.0A/B, and multiple serial interfaces. Operating at up to 55MHz, it is housed in a 100-pin LQFP package and targets industrial and embedded networking applications.

Key Specifications

Core ARM7TDMI (32-bit)
Max Clock Frequency 55 MHz
Flash Memory 256 KB
SRAM 64 KB
I/O Pins 62
USB 2.0 Full Speed Device
Ethernet MAC 10/100
CAN 2.0A and 2.0B
USART/UART 3 (2 USART + 1 UART)
SPI 2
TWI (I2C) 1
ADC 8-channel, 10-bit
Core Supply 1.8V (internal regulator)
I/O Supply 1.8V or 3.3V (5V tolerant)
Operating Temperature -40°C ~ 85°C
Package LQFP-100
Part Status In Production

Features

  • 32-bit ARM7TDMI RISC processor at 55MHz
  • Integrated Ethernet MAC 10/100 with DMA
  • USB 2.0 Full Speed device port
  • CAN 2.0A and 2.0B compliant controller
  • Integrated voltage regulator allows single 3.3V supply
  • 5V-tolerant I/O pins
  • 8-channel 10-bit ADC
  • Three 16-bit timers, RTT, and watchdog
  • SSC (Synchronous Serial Controller)
  • Pre-programmed bootloader from USB or UART

Applications

  • Industrial networking and Ethernet-enabled devices
  • Building automation and HVAC controllers
  • CAN bus applications in automotive and industrial
  • USB-enabled embedded systems
  • Point-of-sale terminals and gateways

The AT91SAM7X256C-AU is a member of Microchip’s SAM7X series of 32-bit microcontrollers based on the ARM7TDMI processor. Operating at up to 55MHz, it features 256KB of Flash memory and 64KB of SRAM. The device integrates a comprehensive peripheral set including an Ethernet MAC 10/100 port with DMA, a USB 2.0 Full Speed device port, a CAN 2.0A/B compliant controller, two SPIs, two USARTs, one UART, one TWI (I2C), an SSC, three 16-bit timers, a Real-Time Timer (RTT), and an 8-channel 10-bit ADC. The integrated voltage regulator allows single 3.3V supply operation, with the core running at 1.8V internally. The I/O pins are 5V tolerant, supporting mixed-voltage system designs. A pre-programmed bootloader supports firmware upload via USB or UART interfaces.

The AT91SAM7X256C-AU is built around the ARM7TDMI 32-bit RISC processor core with a 3-stage pipeline executing 32-bit ARM and 16-bit Thumb instruction sets. The Advanced Peripheral Bus (APB) and Advanced High-performance Bus (AHB) connect the processor to peripherals and memory through a DMA controller for efficient data transfer. The Ethernet MAC interfaces to an external PHY via MII/RMII, handling all MAC layer functions including CRC generation and address filtering. The CAN controller manages message filtering, bit timing, and error handling according to CAN 2.0A/B specifications. The USB device controller handles all USB protocol layers including packet formatting, CRC, and endpoint management. The ADC uses a successive approximation register (SAR) architecture with 10-bit resolution.

Pin Name Type Description
1-16 PA0-PA15 I/O Port A I/O (multiplexed with peripheral functions)
17-32 PA16-PA31 I/O Port A I/O (Ethernet, USB, SPI)
33-48 PB0-PB15 I/O Port B I/O (CAN, USART, ADC)
49-64 PB16-PB31 I/O Port B I/O (timer, TWI, SSC)
65 VDDCORE PWR Core power supply (1.8V from internal regulator)
66 VDDIO PWR I/O power supply (1.8V or 3.3V)
67 GND GND Ground
68 VDDIN PWR Main supply input (3.3V)
69 TST I Test mode select
70 NRST I System reset (active low)
71 TCK I JTAG test clock
72 TMS I JTAG test mode select
73 TDI I JTAG test data input
74 TDO O JTAG test data output
75-100 Misc PWR/GND Power, ground, and analog reference pins
  • Industrial Ethernet: Embedded web servers and Modbus/TCP gateways with integrated MAC
  • CAN Networks: Automotive and industrial bus controllers with CAN 2.0B support
  • USB Peripherals: Custom USB device classes for data acquisition and control
  • Building Automation: HVAC controllers combining Ethernet, CAN, and serial interfaces
  • POS Systems: Point-of-sale terminals requiring Ethernet and USB connectivity
Model Manufacturer Key Difference
AT91SAM7X256C-AUR Microchip Tape & Reel packaging variant
AT91SAM7X128C-AU Microchip 128KB Flash, 32KB SRAM, lower cost
AT91SAM7A3C-AU Microchip No Ethernet, more CAN channels
SAM4E16E Microchip Cortex-M4, 120MHz, Ethernet+CAN, pin-rich
STM32F107VCT6 STMicroelectronics Cortex-M3, Ethernet, CAN, 72MHz
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All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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