Atmel AT91SAM7S256B-AU

Mfr. Part

AT91SAM7S256B-AU

Manufacturer

Atmel now Microchip Technology. Y-IC is a quality distributor for Microchip Atmel products and we are committed to delivering genuine parts, fast logistics, and responsive technical and commercial support

Detailed Description

32-bit ARM7TDMI-S microcontroller from the SAM7S family with 256 KB in-system programmable Flash and about 64 KB SRAM. Integrated full-speed USB device, multiple serial interfaces, timers, 10-bit ADC, PWM, and on-chip power management. Package is 64-lead LQFP lead-free AU variant. The B revision is a proven, mature spin focused on stability and broad compatibility

Key Features

ARM7TDMI-S 32-bit RISC CPU with embedded ICE and Thumb support

Up to roughly 55 MHz system clock with PLL and low-jitter clocking from main crystal or external clock

256 KB Flash with security and lock bits, fast erase and program, ROM bootloader support

About 64 KB SRAM for code and data

Full-speed USB 2.0 device with transceiver on-chip

Communication interfaces including up to 3 USARTs, up to 2 SPIs, and 1 TWI I2C

10-bit ADC with multiple input channels for sensor and analog acquisition

Timer Counter block with 16-bit channels for capture, compare, and waveform

PWM output capability for motor control, lighting, and power regulation

Watchdog, real-time timer, brownout detector, power-on reset, and clock monitor

General-purpose I O lines with multiplexed peripheral functions and interrupt capability

JTAG and serial debug interfaces, in-system programming via USB or UART using SAM-BA ROM boot

On-chip voltage regulator feeding 1.8 V core from 3.3 V supply for simpler power design

Low power modes including idle and power-down with fast wake-up from interrupts

Industrial temperature range availability for robust designs

Key Advantages

Mature and widely deployed platform with stable tools, examples, and community knowledge

Integrated USB device and rich peripheral mix reduce external components and BOM cost

ROM bootloader simplifies production flashing and in-field firmware updates without extra hardware

Pin-compatible scaling within the SAM7S family enables easy upgrades or cost-downs

Proven long-term reliability supported by Microchip supply chain and documentation

Simple power architecture with internal regulator and flexible clocking reduces design complexity

Packaging

Type 64-lead LQFP surface-mount package AU lead-free RoHS compliant

Material Molded epoxy package with copper alloy leadframe and matte tin plating

Size Standard 64-LQFP body approximately 10 x 10 mm with 0.5 mm lead pitch refer to datasheet for exact mechanicals

Pin configuration 64 leads including multiple VDDIO 3.0 to 3.6 V and GND pins, regulated VDDCORE 1.8 V domain, JTAG pins, USB D plus and D minus, main and slow clock pins, and multiplexed peripheral I O via PIO controllers

Thermal characteristics Typical junction to ambient thermal resistance depends strongly on PCB copper and airflow often in the range of roughly 60 to 100 C W refer to datasheet and JEDEC conditions

Electrical properties Core voltage nominal 1.8 V via internal regulator, I O at 3.0 to 3.6 V not 5 V tolerant, system clock up to about 55 MHz, USB full-speed 12 Mbps, industrial ambient temperature range commonly minus 40 to plus 85 C see datasheet for limits

Lifecycle

Status Mature and still supported by Microchip for many applications however the ARM7 family is aging and may be limited for new advanced designs

Drop-in equivalents within family AT91SAM7S64B-AU AT91SAM7S128B-AU AT91SAM7S256B-AU current device AT91SAM7S512B-AU All are LQFP-64 options with different Flash sizes and are generally pin and software compatible review datasheets for minor differences such as revision B vs C

Functionally similar modern alternatives not pin-compatible Microchip SAM D21 Cortex-M0 plus SAM E51 E54 Cortex-M4F SAM C21 with CAN depending on feature needs These offer higher performance lower power and newer toolchains

If you require confirmed lifecycle status or a tailored cross list please contact our Y-IC sales team via our website for the latest guidance and sourcing options

Key Application Areas

USB peripherals such as HID devices mass storage bridges and data loggers

Industrial control PLC interface simple gateways and protocol converters

Instrumentation with mixed-signal needs using the integrated ADC

Motor control LED lighting and power control using PWM and timers

Consumer electronics and small appliances requiring reliable USB and serial

Education and legacy ARM7 maintenance or expansion projects

Datasheet

Y-IC hosts the most authoritative and up-to-date datasheet for AT91SAM7S256B-AU on this product page. We recommend downloading it here to get exact electrical limits pinouts mechanical drawings programming model and all timing details

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