A low-power, high-performance Microchip's ARM® Cortex®-M0+ based flash microcontroller, the ATSAMD21G18 is ideal for a wide range of home automation, consumer, metering, and industrial applications. It features:

• 256KB of flash and 32KB of SRAM
• Up to 48MHz operating frequency
• Six serial communication modules (SERCOM) configurable as UART/USART, SPI or I2C, three 16-bit timer/counters, 32-bit Real-Time Clock and calendar, 20 PWM channels, one 14-channel 12-bit ADC, one 10-bit DAC
• Full Speed USB Device and embedded Host
• Support for up to 120 touch channels
• 1.62V to 3.63V power supply
• Easy pin migration to SAMD21G and SAMD21J devices
• Supported by Atmel Studio, ASF and the SAM D21 Xplained Pro kit

Processor

• ARM Cortex-M0+ CPU running at up to 48MHz
  • Single-cycle hardware multiplier
  • Micro Trace Buffer

Memories

• 256KB in-system self-programmable Flash
• 32KB SRAM Memory

System

• Power-on reset (POR) and brown-out detection (BOD)
• Internal and external clock options with 48MHDigital Frequency Locked Loop (DFLL48M) and 48MHto 96MHFractional
• External Interrupt Controller (EIC)
• 16 external interrupts
• One non-maskable interrupt
• Two-pin Serial Wire Debug (SWD) programming, test and debugging interface
• Drop in compatible with SAM D20

Low Power

• Idle and standby sleep modes
• SleepWalking peripherals

Peripherals

• 12-channel Direct Memory Access Controller (DMAC)
• 12-channel Event System
• Up to five 16-bit Timer/Counters (TC), configurable as either:
  • One 16-bit TC with compare/capture channels
  • One 8-bit TC with compare/capture channels
  • One 32-bit TC with compare/capture channels, by using two TCs
• Three  24-bit Timer/Counters for Control (TCC), with extended functions:
  • Up to four compare channels with optional complementary output
  • Generation of synchronized pulse width modulation (PWM) pattern across port pins
  • Deterministic fault protection, fast decay and configurable dead-time between complementary output
  • Dithering that increase resolution with up to 5 bit and reduce quantization error
• 32-bit Real Time Counter (RTC) with clock/calendar function
• Watchdog Timer (WDT)
• CRC-32 generator
• One full-speed (12Mbps) Universal Serial Bus (USB) 2.0 interface
  • Embedded device function
  • Eight endpoints
• Six Serial Communication Interfaces (SERCOM), each configurable to operate as either:
  • USART with full-duplex and single-wire half-duplex configuration
  • I2C Bus up to 3.4MHz
  • SMBUS/PMBUS
  • SPI
  • LIN slave
• 12-bit, 350ksps Analog-to-Digital Converter (ADC) with up to 14 channels
  • Differential and single-ended input
  • 1/2x to 16x programmable gain stage
  • Automatic offset and gain error compensation
  • Oversampling and decimation in hardware to support 13-, 14-, 15- or 16-bit resolution
• 10-bit, 350ksps Digital-to-Analog Converter (DAC)
• Two Analog Comparators (AC) with window compare function
• Peripheral Touch Controller (PTC)
  • 256-channel capacitive touch and proximity sensing

I/O

• 38 GPIO pins

Packages

• 48-pin TQFP, QFN, WLCSP

Operating Voltage

• 1.62V – 3.63V