ATSAM3U2EA-AU

Suffix Breakdown

• 2EA: 128 KB Flash, 36 KB SRAM variant with full external bus interface
• AU: 144-pin LQFP surface-mount package, industrial temperature grade (-40°C ~ +85°C)
• Tape-and-reel counterpart: ATSAM3U2EA-AUTR

1. Core Architecture & Memory Resources

CPU Core

• ARM Cortex-M3 Rev 2.0 core, maximum operating frequency 96 MHz, integrated Memory Protection Unit (MPU)
• Thumb-2 instruction set, 5-layer multi-AHB bus matrix, total 22 independent DMA channels (17 PDC peripheral DMA + 4 central DMA)
• Single dedicated PLL for main system clock, separate dedicated PLL for USB 2.0 High-Speed clock generation
• SWD two-wire debug interface, lightweight Micro Trace Buffer (MTB) for real-time trace debugging

Memory Layout

• Program Flash: 128 KB dual-bank Flash (128-bit wide access with memory accelerator), supports in-application programming (IAP) and read-while-write
• Data SRAM: 36 KB dual-bank high-speed volatile RAM
• System Boot ROM: 16 KB preloaded with UART/USB DFU bootloader and IAP firmware
• External Memory Interface (SMC): Supports SRAM, NOR Flash, NAND Flash with built-in 4 KB NAND buffer and hardware ECC correction; 4 chip selects, 8/16-bit parallel bus width

2. Integrated Peripherals

High-Speed Communication Modules

• USB 2.0 High-Speed Device controller (480 Mbps), 4 KB dedicated FIFO, 7 bidirectional endpoints with independent DMA
• HSMCI high-speed multimedia card interface for SD / SDIO / MMC storage
• 4 × USART (support ISO7816, IrDA, hardware flow control, Manchester coding) + 1 × basic UART
• 2 × TWI (I²C compatible) master/slave interfaces
• 5 × SPI synchronous serial ports, 1 × SSC I2S audio serial controller
• Real-Time Event Manager for hardware inter-peripheral synchronization without CPU intervention

Analog Modules

• 8-channel 12-bit SAR ADC (1 MSPS sampling rate) with differential input pairs and programmable gain amplifiers (PGA)
• 8-channel 10-bit DAC for analog waveform output
• On-chip bandgap voltage reference and internal die temperature sensor
• High-speed analog comparator with interrupt wake trigger

Timing & Control Peripherals

• 3 × 16-bit Timer/Counter (TC): Input capture, output compare, quadrature encoder interface
• 4-channel 16-bit PWMC high-resolution PWM generator for motor drive and LED dimming
• 32-bit RTT real-time timer + full-featured RTC calendar with leap-year auto-compensation and dual alarm interrupts
• Independent watchdog timer (WDT), programmable POR power-on reset and multi-stage brown-out detection (BOD)

3. Power Management & Low-Power Modes

• Single wide supply voltage: 1.62 V ~ 3.6 V, with embedded on-chip linear voltage regulator for core power
• Three hierarchical low-power operating modes:
  1. Sleep: CPU halted, all peripherals active
  2. Wait: Main system clock disabled, limited peripherals functional
  3. Backup: Only RTC, RTT and wake logic active; typical consumption as low as 1.65 µA
• Multiple clock sources: 3–20 MHz external crystal, factory-trimmed 8/12 MHz internal RC, ultra-low-power 32 kHz slow RC, 32.768 kHz crystal for RTC

4. I/O & Reliability Features

• Up to 96 multi-function general-purpose digital I/O pins with integrated on-die termination resistors
• All signal pins support high ESD protection for industrial wiring environments
• Flash memory hardware ECC error correction, clock failure detection safety logic
• Per-pin software-configurable pull-up/down resistors, external interrupt and pin-change wake-up capability

5. Electrical & Environmental Ratings

• Operating temperature range (Industrial Grade): -40°C to +85°C
• MSL 3 moisture sensitivity level (168-hour floor life before reflow soldering)
• Fully RoHS lead-free and halogen-free compliant
• Typical active power consumption: 2.3 mA @ 1 MHz, 1.3 mA @ 500 kHz clock frequency

6. Package Information

• Package: 144-pin LQFP surface mount, 20 mm × 20 mm footprint, 0.5 mm pin pitch
• Tray packaging as standard; tape-and-reel version available for mass automated SMT assembly

Typical Applications

• Industrial data acquisition systems with external parallel NAND/NOR storage
• High-speed USB portable test & measurement instruments and data loggers
• Medical diagnostic equipment with multi-channel analog sampling and SD storage
• Motor control drives, BLDC/PMSM closed-loop control with high-resolution PWM
• Embedded industrial gateways with multi-serial bus (RS485, SPI, I2C) expansion
• Portable audio devices, MIDI equipment and I2S digital audio processing hardware
• POS payment terminals, digital signage and SDIO peripheral controller boards
• Battery-powered industrial field monitoring nodes with high-speed USB data upload