Parts SAM Microcontrollers Family SAMD21G ATSAMD21G18A

MCHPATSAMD21G18A

Name: ATSAMD21G18A
Brand: Microchip Technology

Microchip Technology

ARM Cortex-M0+ MCU with strong Arduino and low-power application support, useful for single-core embedded designs.

Active2,131 in stock

Datasheet Digi-Key Mouser Compare Prices

Overview

The ATSAMD21G18A is a 32-bit ARM Cortex-M0+ microcontroller from Microchip with 256 KB of flash and 32 KB of SRAM. It runs up to 48 MHz, supports a wide peripheral set including USB, SPI, I2C, UART, DMA and PWM, and exposes about 38 GPIOs. The device operates from 1.62 V to 3.6 V, making it suitable for battery-powered and 3.3 V systems.

Why Choose This Part

Well-balanced memory (256 KB flash, 32 KB SRAM), a 48 MHz Cortex-M0+ core and an extensive peripheral set provide ample capability for single-core embedded designs. Strong Arduino ecosystem support plus native USB and low-voltage operation simplify prototyping and product development for USB-enabled and battery-powered applications. The device also includes DMA, watchdog, brown-out and power-on reset peripherals that make reliable embedded designs easier to implement.

Applications

Arduino-compatible development

Core MCU for Arduino Zero, Feather M0 and other SAMD21-based boards where Arduino core compatibility and easy prototyping are desired.

Battery-powered sensors and wearables

Low-voltage operation and sleep modes make it a good fit for battery-operated sensor nodes and small wearable devices.

USB devices and HID endpoints

On-chip USB device support enables USB CDC, HID, MIDI and mass-storage class implementations without an external bridge.

Low-to-moderate control and measurement

Sufficient flash, RAM and peripherals for motor control PWM, data logging, sensor fusion and general embedded control tasks.

Custom human interface devices

Combination of USB, multiple UART/SPI/I2C and many GPIOs suits keyboards, controllers and other custom USB-enabled interfaces.

Key Specifications

Speed 48MHz

RAM Size 32K x 8

Core Size 32-Bit

Peripherals Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT

Connectivity I2C, LINbus, SPI, UART/USART, USB

Mounting Type Surface Mount

Number of I/O 38

Core Processor ARM Cortex-M0+

Package / Case 48-VFQFN Exposed Pad

Data Converters A/D 14x12b; D/A 1x10b

Oscillator Type Internal

Program Memory Size 256KB (256K x 8)

Program Memory Type FLASH

Operating Temperature -40degC ~ 85degC (TA)

Supplier Device Package 48-QFN (7x7)

Voltage - Supply (Vcc/Vdd) 1.62V ~ 3.6V

Getting Started

Common development boards include Arduino Zero, Adafruit Feather M0 and SparkFun SAMD21-based boards which come preloaded with Arduino-compatible bootloaders. Development toolchains include the Arduino IDE, Microchip/Atmel Studio and GCC-based toolchains (arm-none-eabi) with debugging via SWD using CMSIS-DAP or Atmel-ICE. When designing hardware, follow the reference schematics for USB D+/D- routing and ensure the chosen supply voltage stays within the 1.62 V to 3.6 V range.

Dev Boards

Development boards and breakout modules featuring the ATSAMD21G18A or compatible chips — ready to use for prototyping.

Seeed Studio XIAO SAMD21 Seeed Technology Co., Ltd

ATSAMD21G18 XIAO SAMD21 SAM D ARM® Cortex®-M0 MCU 32-Bit Embedded Evaluation Board

Digi-Key 509 in stock

Seeed Studio XIAO SAMD21 Seeed Technology Co., Ltd

ATSAMD21G18 XIAO SAMD21 SAM D ARM® Cortex®-M0+ MCU 32-Bit Embedded Evaluation Board

Digi-Key 3,141 in stock

Adafruit Feather M0 Express Adafruit Industries LLC

ATSAMD21G18 Feather M0 Express SAM D ARM® Cortex®-M0+ MCU 32-Bit Embedded Evaluation Board

Digi-Key Mouser 364 in stock

Arduino Nano 33 IoT Arduino

The Arduino Nano 33 IoT with Headers (ABX00032) is a compact and versatile development board featuring the ARM® Cortex®-

Digi-Key Mouser 355 in stock

Arduino Nano 33 IoT Arduino

The Arduino Nano 33 IoT (ABX00027) is an advanced evaluation platform designed for IoT applications, featuring the 32 bi

Digi-Key Mouser 657 in stock

Part of SAM Microcontrollers family » SAMD21G

SAMD21G Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number	Package	Temp Range	Stock
ATSAMD21G18A (this part)	VFQFN-48	-40degC ~ 85degC (..	2,131
ATSAMD21G18A-AU	TQFP-48	-40degC ~ 85degC (..	3,277
ATSAMD21G18A-AUT	TQFP-48	-40degC ~ 85degC (..	4,963
ATSAMD21G18A-AFT	TQFP-48	-40degC ~ 125degC ..	20,008
ATSAMD21G18A-MUT	VFQFN-48	-40degC ~ 85degC (..	3,079
ATSAMD21G18A-MFT	VFQFN-48	-40degC ~ 125degC ..	7,004
ATSAMD21G18A-AF	TQFP-48	-40degC ~ 125degC ..	1,491

Also available as: ATSAMD21G18A-MZVAO, ATSAMD21G16B-AZVAO, ATSAMD21G17D-AZVAO, ATSAMD21G18A-MF

Also Consider

ATSAMD51J19A MCHPMicrochip Technology - Higher-performance Cortex-M4F alternative in the Microchip SAM family when more CPU performance and DSP/FPU are needed.

STM32F103C8T6