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AT91SAM7S256D-MU

ARM7TDMI 55MHz MCU, 256KB Flash, 64KB SRAM, USB FS, QFN-64

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Manufacturer Part：

AT91SAM7S256D-MU

Package：

QFN-64 (9 x 9 x 0.9 mm, 0.5mm pitch)

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Description

Product Overview

The AT91SAM7S256D-MU from Microchip Technology (formerly Atmel) is an ARM7TDMI-based 32-bit microcontroller running at 55 MHz with 256 KB Flash, 64 KB SRAM, USB 2.0 FS, and rich peripherals in a QFN-64 package.

Key Specifications

Type ARM7TDMI 32-bit Flash Microcontroller
CPU ARM7TDMI, 55 MHz, 27 MIPS
Flash 256 KB (1024 pages x 256 bytes)
SRAM 64 KB (single-cycle access)
USB 2.0 Full Speed Device (12 Mbps)
USART 2x USART + 1x Debug UART
SPI 1x Master/Slave
I2C (TWI) 1x Master/Slave
SSC 1x Synchronous Serial Controller
ADC 8-channel, 10-bit, 4-channel multiplexed with digital I/O
PWM 4-channel 16-bit
Timer/Counter 3-channel 16-bit
Supply Voltage 1.65 V to 3.6 V (core via internal 1.8V regulator)
I/O 32 programmable I/O lines
Package QFN-64 (9 x 9 mm)
Operating Temperature -40C to +85C

Features

  • ARM7TDMI 32-bit RISC core with 16-bit Thumb instruction set
  • 256 KB Flash with 100K erase/write cycles
  • 64 KB SRAM with single-cycle access at max speed
  • USB 2.0 FS device with embedded PHY
  • Peripheral DMA Controller (11 channels)
  • Embedded 1.8V regulator for core supply
  • Advanced Interrupt Controller (AIC)
  • IEEE 1149.1 JTAG boundary scan

Applications

  • USB devices and HID peripherals
  • Industrial automation controllers
  • Point-of-sale terminals
  • Access control and security systems

The AT91SAM7S256D-MU from Microchip (formerly Atmel) is a 32-bit ARM7TDMI-based microcontroller operating at up to 55 MHz with 27 MIPS throughput. The device integrates 256 KB Flash, 64 KB SRAM, and a rich peripheral set including USB 2.0 full-speed device, two USARTs, SPI, TWI (I2C), SSC, 8-channel 10-bit ADC, 4-channel PWM, and three 16-bit timer/counters. The Peripheral DMA Controller (PDC) with 11 channels offloads the CPU from data transfer tasks. An internal 1.8V voltage regulator allows the device to operate from a single 3.3V supply, generating the core voltage internally. The -MU suffix indicates QFN-64 package with matte tin finish. This is a well-established industrial MCU with long-term availability.

The AT91SAM7S256D-MU uses the ARM7TDMI core, a 3-stage pipeline (fetch, decode, execute) processor supporting both 32-bit ARM and 16-bit Thumb instruction sets. The Thumb instruction set provides a code-density advantage for applications where Flash memory is a constraint. The 256 KB Flash is organized as 1024 pages of 256 bytes, with a 128-byte write buffer and page erase capability. The 64 KB SRAM is accessible in a single cycle at the maximum clock frequency. The Peripheral DMA Controller (PDC) provides 11 channels that transfer data between peripherals (USART, SPI, SSC, etc.) and memory without CPU intervention, using a linked-list descriptor structure. The USB device controller handles the USB 2.0 FS protocol in hardware, with dedicated endpoint FIFOs. The Advanced Interrupt Controller (AIC) prioritizes and vectors 32 interrupt sources, with 8-level priority and shadow register for fast context switching.

Pin Group Name Type Function
Multiple PA0-PA31 I/O GPIO with peripheral multiplexing
Dedicated VDDIO/VDDCORE Power I/O (3.0-3.6V) / Core (1.8V internal)
Dedicated VDDPLL/VDDFlash Power PLL and Flash supplies
Dedicated USB_DP/DM I/O USB data lines
Dedicated TCK/TDI/TDO/TMS I/O JTAG debug interface
Dedicated NRST Input System reset (active LOW)
  • USB HID keyboard/mouse device with GPIO and ADC
  • Industrial Modbus RTU slave with USART and RS-485 transceiver
  • Access control card reader with smart card interface via USART
  • Point-of-sale thermal printer controller with USB and SPI
Manufacturer Part Number Package Notes
Microchip AT91SAM7S256D-AU LQFP-64 Same device, LQFP package
Microchip ATSAM4S8B-MU QFN-64 Cortex-M4, 120MHz, upgrade path
ST STM32F103C8T6 LQFP-48 Cortex-M3, 72MHz, USB FS
NXP LPC2148FBD64 LQFP-64 ARM7TDMI, USB, similar class
Microchip AT91SAM7X256D-MU QFN-64 Same + Ethernet MAC
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Quality Assurance

Quality is the core foundation of our long-term global cooperation. With over 20 years of experience in the electronic component industry, Materialparts has built a strict and standardized quality management system covering component sourcing, incoming inspection, full-batch testing, packaging and delivery. We are committed to delivering 100% genuine, high-reliability electronic components for industrial control, automotive electronics, consumer electronics and medical device industries, and fully safeguarding your production and R&D projects.

1. Authorized & Genuine Sourcing Promise

All of our electronic components are procured from official authorized distributors and original manufacturers. We strictly reject counterfeits, refurbished parts, disassembled components and gray-market goods. Every product is guaranteed to be brand-new original parts and fully consistent with the original technical parameters. For branded products such as NXP IC series, we maintain complete supply channel documents to realize full product traceability.

2. Strict Full-batch Quality Inspection

We implement 100% full-batch quality control for all goods before shipment. Our professional QC team conducts multi-dimensional tests including appearance inspection, electrical parameter testing, performance verification and packaging check. Each batch of components is attached with complete inspection reports and batch records. We stick to zero-tolerance standards for defective products to ensure every piece of component meets industrial application requirements.

3. Industry Standard Compliance

Our products comply with a variety of international industry quality standards to adapt to high-standard application scenarios:
  • Automotive Electronics: All automotive-grade components pass AEC-Q series certification, featuring excellent stability and durability to adapt to complex vehicle operating environments.
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  • Industrial Control & Consumer Electronics: Products conform to universal international electronic industry standards, suitable for long-term continuous operation of various equipment.

4. Professional Reliability Control

For static-sensitive, moisture-sensitive and precision components such as ICs, PCBs, sensors and connectors, we carry out reliability screening in advance. Combined with standardized ESD anti-static packaging and vacuum moisture-proof packaging, we avoid component damage caused by static electricity, dampness or collision during storage and transportation, and retain the original performance of products.

5. Traceability Management System

We establish a complete product traceability system. Each batch of goods corresponds to independent batch number, sourcing record, inspection record and delivery record. Customers can query the whole lifecycle information of components at any time. This system effectively solves quality risks and facilitates after-sales handling and production quality control for your company.

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If any product is confirmed to have non-conformity quality problems due to our reasons after receipt, we provide free return, exchange and supplementary delivery services. Our professional quality team will also conduct root cause analysis to optimize our quality control process. We respond to quality feedback within 24 hours to resolve your worries efficiently.

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Email: info@materialparts.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China

 

Shipping & Payment

Materialparts is a professional global supplier of electronic components with over 20 years of industry experience. We provide one-stop supply of passive components, integrated circuits, as well as parts for industrial control, automotive electronics, consumer electronics and medical devices. Below are the unified shipping and payment policies applicable to all orders, samples and bulk purchases worldwide.

1. Payment Terms

We offer a variety of secure and convenient payment methods to meet diverse business cooperation needs. Details are as follows:
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  1. Settlement Currency

     

    US Dollar (USD) is the default settlement currency. RMB is available for domestic customers.

  2. Bank Charges

     

    All transfer fees, intermediary bank charges and other remittance-related expenses shall be borne by the buyer.

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  1. Order Processing Time
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  • Out-of-stock or sourced items: The delivery lead time will be confirmed separately according to brand and inventory status.
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  • Air Freight: 7 – 12 working days
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    We support flexible minimum order quantities for samples, small-batch and large-batch orders. All sample orders shall comply with the above shipping and payment policies.

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4. Customs & Liability Statement

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  2. Handling of Lost or Damaged Goods
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5. Local Pickup in Shenzhen

Local pickup service is available for customers in Shenzhen and surrounding areas:
  • Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong Province, China
  • Business Hours: 09:00 – 18:00, Monday to Friday. Closed on weekends and official public holidays.
  • Notice: Please make an appointment via email or communication tools one day in advance, and present your order information upon pickup.

Contact Information

Email: info@materialparts.com

Tel / WhatsApp: +86 13760382860

Service & Packaging

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

Core Services

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We specialize in a full range of passive and active electronic components, including SMD resistors, power resistors, connectors, aviation connectors, LED beads, flexible circuit boards, printed circuit boards, and integrated circuits. Our professional team provides BOM list consolidation, component matching, and alternative model recommendation services. We support sample orders, small-batch trial production, and mass production orders with flexible MOQs to meet diverse procurement needs.

2. Genuine Product Guarantee & Full-process Quality Inspection

All products are sourced from official authorized channels and are 100% original genuine parts. Every batch of goods undergoes strict full-process quality inspection before delivery, with complete batch records and traceability documents provided. Our products comply with AEC-Q standards for automotive electronics and high-reliability specifications for medical devices. We eliminate counterfeits, refurbished parts and defective products from the source to secure your project production.

3. Fast Quotation & Order Processing

Our customer service team responds promptly to inquiries and quotation requests. All in-stock orders will be processed within one working day. We provide stocking reservation services for long-term cooperative customers, effectively solving problems such as component shortages and unstable supply chains.

4. Professional Technical Support

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5. Sourcing for Special Components

Relying on our global supply chain network, we professionally source scarce components, obsolete parts and customized special components to efficiently solve your procurement difficulties.

6. Global Logistics & Document Services

We cooperate with mainstream international logistics providers including DHL, FedEx, UPS and TNT to achieve fast global delivery. We can provide complete export documents such as customs declaration files, commercial invoices and packing lists to ensure smooth customs clearance for international shipments. Local pickup is also available for customers in Shenzhen, China.

Professional Packaging Standards

Electronic components are sensitive to static electricity, collision, moisture and dust. We adopt industry-standard anti-static packaging solutions to fully ensure the integrity of goods during transportation and storage.

1. General Packaging Specifications

  • All components are packed separately to avoid damage caused by friction and collision;
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2. Classified Professional Packaging

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  • Original Factory Packaging: Integrated circuits of brands such as NXP are delivered with original reels, trays or tubes by default, retaining complete original packaging and adapting to automated SMT production lines.
  • Discrete Device Packaging: Discrete devices such as SMD resistors, power resistors and LEDs are quantitatively and classifiedly packaged with accurate quantity and clear marking.
  • Connector / Aviation Connector Packaging: Hard outer packaging is adopted to prevent pin bending and structural deformation.

3. Custom Packaging Services

We provide value-added services including personalized packaging, custom labeling and re-reeling according to customer requirements, fully matching your production and warehouse management standards.

Contact Information

For service consultation or packaging customization, please feel free to contact us:
Email: info@materialparts.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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