ATSAMD21G18A-AU

Suffix Breakdown

• G: 48-pin device variant
• 18A: 256 KB Flash memory enhanced revision
• AU: 48-pin TQFP surface-mount package, commercial industrial temperature grade (-40°C ~ +85°C)

1. Core & Memory Specifications

CPU Architecture

• ARM Cortex-M0+ core, maximum operating frequency: 48 MHz, 2.46 CoreMark/MHz efficiency
• Single-cycle 32-bit hardware multiplier, Micro Trace Buffer (MTB) for lightweight debug tracing
• Two-wire SWD serial wire debug & programming interface
• 12-channel DMA controller for zero-CPU peripheral data transfer
• 12-channel Event System for hardware-triggered inter-peripheral synchronization without CPU intervention

Memory Resources

• Program Flash: 256 KB in-system self-programmable Flash, supports read-while-write operation
• Data SRAM: 32 KB high-speed volatile RAM
• Endurance: Minimum 10,000 Flash erase/write cycles; >20 years data retention at 85°C

2. Integrated Peripherals

Analog Modules

• 14-channel 12-bit SAR ADC with hardware oversampling for improved resolution
• 1-channel 10-bit voltage DAC for analog waveform output
• Capacitive touch peripheral supporting up to 120 touch channels (buttons, sliders, wheels)
• Internal bandgap voltage reference, on-chip die temperature sensor

Timing & Control Modules

• 3 × 24-bit Timer/Counter for Control (TCC) with up to 20 independent PWM channels, complementary output & dead-time generation
• 5 × 16-bit general-purpose Timer/Counter (TC) for input capture, frequency measurement
• 32-bit battery-backed Real-Time Clock/Calendar (RTCC) with leap-year auto compensation
• Independent watchdog timer (WDT), POR power-on reset & multi-stage brown-out detection (BOD)

Serial Communication Interfaces

• 6 reconfigurable SERCOM modules, each configurable as UART/USART, SPI, or I²C master/slave
• Built-in Full-Speed USB 2.0 device controller (supports USB CDC, HID, MSC protocols)
• I2S audio serial interface for external CODEC connection

I/O & Power Features

• 38 multi-function general-purpose digital I/O pins with individual pull-up resistors
• Wide single supply voltage range: 1.62 V ~ 3.63 V, optimized for lithium battery-powered devices
• Four hierarchical low-power sleep modes (Active / Wait / Standby / Deep Sleep) to minimize quiescent current
• Multiple internal oscillators: 48 MHz DFLL, 8 MHz RC, 32.768 kHz crystal oscillator, ultra-low-power 32 kHz internal oscillator

3. Electrical & Environmental Ratings

• Operating temperature range: -40°C to +85°C industrial commercial grade
• MSL 3 moisture sensitivity level (168-hour floor life before reflow soldering)
• Fully RoHS lead-free and halogen-free compliant
• Standard tube packaging; tape-and-reel variant ATSAMD21G18A-AUTR available for mass SMT production

4. Package Information

• Package: 48-pin thin quad flat pack (TQFP), 7 mm × 7 mm compact footprint
• Surface-mount design for dense PCB layouts in sensor, wearable and IoT hardware

Typical Applications

• Battery-powered IoT wireless sensor nodes (temperature, humidity, pressure monitoring)
• Capacitive touch control panels for household appliances and consumer electronics
• USB peripheral devices (data loggers, portable test instruments, USB adapters)
• Low-power wearable smart devices and portable medical monitoring equipment
• Small DC motor, LED lighting and low-current BLDC closed-loop control systems
• Smart home automation, building access control and environmental data acquisition modules
• Embedded USB audio equipment and portable digital signal processing hardware
• Arduino-compatible embedded development boards and prototype demo platforms