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AT91SAM7A3-AU
AT91SAM7A3-AU
| Part Number | AT91SAM7A3-AU |
|---|---|
| Manufacturer | Microchip Technology / Atmel |
| Category | Integrated Circuits (ICs) > Embedded – Microcontrollers (MCU) |
| Description | 32-Bit ARM7TDMI Microcontroller, 256KB Embedded Flash, 32KB SRAM, Dual CAN, USB 2.0 Full-Speed, 100-LQFP Package. |
| Stock Status | In Stock |
| Origin | Original Factory |
Product Overview
The AT91SAM7A3-AU is a low-power 32-bit ARM7TDMI microcontroller from Microchip (formerly Atmel). Designed for automotive CAN networks and industrial communication gateways, it integrates 256KB Flash, 32KB SRAM, dual CAN 2.0A/B controllers, 8-channel 10-bit ADC, USB 2.0 Full-Speed and PDC DMA. Housed in 100-lead LQFP, it delivers stable real-time performance for embedded industrial and automotive control systems.
Core Advantages
Dual CAN 2.0A/B Bus Controllers
Two independent CAN interfaces with dedicated mailboxes, ideal for automotive subnetwork bridging and industrial CANopen equipment.
Built-in PDC Peripheral DMA
Multi-channel hardware DMA transfers data between memory and peripherals without CPU intervention, lowering system interrupt load.
Adjustable Power & Clock Control
Integrated PMC with dynamic clock gating and low-power modes to optimize power consumption for diverse task loads.
Secure In-System Programmable Flash
256KB high-endurance Flash supports 30MHz single-cycle access, equipped with lock bits to protect proprietary firmware.
Key Specifications
| Brand | Microchip / Atmel AT91SAM Smart ARM Microcontrollers |
|---|---|
| RoHS Status | RoHS Compliant / Lead-Free / Green Package (-AU) |
| EDA/CAD Model | Schematic symbol models, 3D CAD step files, and 100-LQFP footprint land patterns are available on request |
| Warranty | 1-Year Standard Quality Warranty |
| Package / Case | 100-LQFP (14.00 mm × 14.00 mm × 1.40 mm) |
| Mounting Type | Surface Mount (SMT / SMD) |
| Surface Marking / Silkscreen | AT91SAM7A3 AU Marking |
| Processor Core | 32-Bit ARM7TDMI RISC Core (with THUMB 16-bit instruction set support) |
| Max Operating Frequency | 60 MHz |
| Program Memory (Flash) | 256 KB In-System Programmable Flash Memory |
| RAM Capacity | 32 KB High-Speed SRAM |
| Networking / Connectivity | 2 × CAN 2.0A/B Ports, 1 × USB 2.0 Full-Speed Device (12 Mbps), 3 × USART, 2 × SPI, I2C (TWI), SSC |
| Analog-to-Digital Converter | 8-Channel, 10-Bit ADC with programmable gain and triggers |
| Core Voltage (VDDCORE) | 1.65V to 1.95V (1.8V Nominal internal regulator input) |
| I/O Supply Voltage (VDDIO) | 3.0V to 3.6V (3.3V Standard digital I/O tolerance) |
| Operating Temperature Range | -40°C to +85°C (Industrial Grade Specification) |
| Oscillator Type | Supports internal and external clock sources |
| Peripheral DMA | Built-in PDC (Peripheral DMA Controller) |
| Additional Peripherals | Independent Watchdog Timer, PWM Controller |
| Debug Interface | Embedded ICE Debug Interface |
| Lifecycle Status | Obsolete / Discontinued, production stopped |
| Replacement Recommendation | For new projects, migrate to SAM3 series or modern Cortex-M MCU products |
Typical Applications
- Automotive body control modules (BCM), door control units, and CAN bus gateway nodes
- Industrial automation controllers, CANopen/DeviceNet PLC expansion modules, and sensor networks
- USB-to-CAN diagnostic interfaces, vehicle telemetry recorders, and fleet monitoring boxes
- Smart metering systems, power grid communications controllers, and data concentrators
- Security control panels, automated building access systems, and motor control hubs
Order & Shipping Info
| Minimum Order Quantity (MOQ) | 1 Piece |
|---|---|
| Shipping Time | Shipped within 1-2 business days |
| Delivery Time | 3-7 working days worldwide |
| Shipping Methods | DHL, UPS, FedEx, EMS |
| Payment Methods | T/T (Bank Transfer), PayPal, Credit Card, Western Union |
Technical Support
For datasheet, sample requests, stock check, or bulk pricing, please use the Quick Inquiry form. We will reply within 24 hours.
Frequently Asked Questions
Q1: What do “-AU” suffix codes mean for AT91SAM7A3-AU?
A: “A” stands for RoHS lead-free 100-lead LQFP package; “U” represents industrial -40°C~+85°C temperature grade, compatible with automotive and industrial SMT production lines.
Q2: Does AT91SAM7A3-AU support 16-bit THUMB instructions to save Flash space?
A: Yes. Its ARM7TDMI core supports THUMB 16-bit instruction set. Mixing 32-bit ARM and 16-bit THUMB code can reduce program size by about 35% effectively.
Q3: Does this MCU integrate an internal regulator for 1.8V core power?
A: It comes with a built-in LDO, converting external 3.3V input to stable 1.8V core voltage, simplifying PCB power circuits and reducing peripheral components.
Q4: How does the internal Flash controller boost running performance?
A: The Flash controller adopts 64-bit access and a 128-bit page buffer, enabling zero wait-state instruction fetch up to 30MHz and improving overall processing speed.
Q5: AT91SAM7A3-AU is obsolete, what replacement do you recommend for new projects?
A: Microchip has discontinued this model. We suggest SAM3 Cortex-M MCUs for new CAN industrial/automotive projects, with higher frequency, larger storage and lower power consumption.
Q6: What is the stock and delivery time of AT91SAM7A3-AU?
A: We keep original stock for equipment maintenance. Small orders ship within 3-5 working days; large bulk orders need pre-confirmation of stock and lead time.
Q7: How many ADC channels does AT91SAM7A3-AU have?
A: It has an 8-channel 10-bit ADC with adjustable gain and multi-trigger modes, suitable for multi-channel analog sensor signal collection in automation equipment.
Q8: Can the dual CAN 2.0A/B interfaces operate independently?
A: The two CAN controllers work fully separately with independent mailboxes and filter masks, supporting two isolated CAN sub-networks for auto and CANopen industrial devices.
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