ATSAMD21G17A-AU

ATSAMD21G17A-AU is Microchip’s SAM D21 family 32-bit microcontroller. It uses a Cortex-M0+ core, runs up to about 48 MHz, and integrates flash and RAM with a rich set of peripherals. Key features include flexible SERCOM blocks (SPI/I2C/UART), multiple timers, an ADC (and other analog modules), an Event System, and extensive sleep/power modes for battery-powered apps. The AU suffix indicates the package: 32-pin QFN (5×5 mm) with pins arranged for compact boards. It supports development in MPLAB X / Atmel Studio or Microchip’s Atmel START, and is commonly used in USB-enabled projects and Arduino-style boards (e.g., Arduino Zero). Typical applications: sensors, wearables, USB peripherals, and other hobbyist/embedded designs needing a small, low-power MCU with on-chip peripherals.

Key features of the ATSAMD21G17A-AU (32‑pin package)
- 32-bit ARM Cortex‑M0+ CPU, up to 48 MHz operation
- Memory: up to 256 KB Flash, up to 32 KB SRAM; EEPROM emulation in Flash
- USB: Full‑Speed USB 2.0 device support
- SERCOM peripherals: up to 3 adaptable SERCOM blocks for SPI, I2C, and UART
- Analog: 12‑bit ADC with multiple input channels (analog I/O)
- Timers and RTC: multiple 16‑bit Timer/Counters and Real‑Time Clock
- Event System for peripheral‑to‑peripheral signaling and reduced CPU load
- Power management: Generic Clock, Power Manager, multiple low‑power sleep modes (Active/Idle/Standby)
- Safety and reliability: Brown‑out detector, watchdog timer
- Debug/Programming: SWD/JTAG debug interface
- Operating voltage: 1.62 V to 3.63 V (typical 3.3 V)
- Package: AU 32‑pin option suitable for compact designs
Source: Microchip ATSAMD21G17A datasheet.

- Pin count: 48 pins (AU package, typically QFN/UFQFN 48‑pin).
- Function: 32‑bit microcontroller unit (MCU) from Microchip/Atmel SAM D21 family — ARM Cortex‑M0+ core with on‑chip flash and SRAM and integrated peripherals (SERCOMs, timers, ADC/DAC, I2C/SPI, etc.) for embedded applications.

- Manufacturer: Microchip Technology Inc. (the Atmel line was acquired by Microchip; ATSAMD21G17A-AU is a Microchip part)
- What kind of company: A U.S.-based semiconductor company that designs and manufactures microcontrollers, analog/mixed-signal ICs, memory, and other embedded solutions.

ATSAMD21G17A-AU is a low‑power 32‑bit MCU (ARM Cortex‑M0+) up to 48 MHz with USB device, multiple SERCOMs (I2C/SPI/UART), 12‑bit ADC, timers/PWM, and Event System. It suits USB-enabled, battery‑powered embedded designs and sensor nodes.
Typical application areas:
- USB peripherals (HID, CDC, MIDI)
- IoT edge sensors and data loggers
- Wearables and handheld meters
- Smart home/controllers and consumer electronics
- Small industrial sensors and control panels
It’s ideal for cost‑sensitive, compact devices requiring USB connectivity and low power.

It’s a 32-pin QFN package (5x5 mm, 0.8 mm pitch) with the AU suffix.