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.

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

ARM Cortex-M0+ CPU running at up to 48MHz
- Single-cycle hardware multiplier
- Micro Trace Buffer
256KB in-system self-programmable Flash
32KB SRAM Memory
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
Idle and standby sleep modes
SleepWalking 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
38 GPIO pins
48-pin TQFP, QFN, WLCSP
1.62V – 3.63V