MICROCHIP ATSAMD21G18A Microcontroller, 48MHz, 256kB Flash, 32kB SRAM
MICROCHIP ATSAMD21G18A 48MHz MCU with 256kB Flash, 32kB SRAM, capacitive touch support & USB for efficient embedded designs.
The MICROCHIP ATSAMD21G18A-AU is a powerful yet low-power ARM Cortex-M0+ based microcontroller, offering an optimal balance of performance and energy efficiency for embedded designs. It features up to 256kB of flash memory and 32kB of SRAM, providing ample space for complex applications.
Designed for straightforward migration within the series, it offers identical peripheral modules, hex-compatible code, a linear address map, and pin-compatible upgrade paths. This simplifies design scaling and future-proofing.
Key features include an intelligent Event System for efficient inter-peripheral communication without CPU intervention, and built-in support for capacitive touch interfaces (buttons, sliders, wheels). Its advanced clock system allows different domains to run at independent frequencies, enabling significant power savings while maintaining high CPU performance.
Core Features & Peripherals:
- Processor: 32-bit ARM Cortex-M0+ core.
- Clock Speed: Maximum operating frequency of 48MHz.
- Memory: 256kB Program Flash and 32kB SRAM.
- Power Management: Low-power idle and standby sleep modes, plus SleepWalking peripherals.
- System Protection: Power-on reset (POR) and brown-out detection (BOD).
- Connectivity: Rich set of interfaces including I2C, I2S, SPI, UART, and USB.
- Analogue Capability: 14-channel, 12-bit ADC for precision sensing.
- Packaging: 48-pin TQFP surface-mount package with 38 programmable I/O pins.
- Embedded control systems
- Internet of Things (IoT) devices
- Consumer electronics with touch interfaces
- Industrial automation and sensing
- Device Core: ARM Cortex-M0+
- Operating Frequency Max: 48MHz
- Program Memory Size: 256KB
- RAM Memory Size: 32KB
- No. of Pins: 48Pins
- IC Case / Package: TQFP
- No. of I/O's: 38I/O's
- Interfaces: I2C, I2S, SPI, UART, USB
- ADC Channels: 14Channels
- ADC Resolution: 12Bit
- Supply Voltage Range: 1.62V to 3.63V
- Operating Temperature Range: -40°C to 85°C
- IC Mounting: Surface Mount
- Weight: 1.1 grams
- Dimensions: 43mm (H) x 33mm (W) x 15mm (D)
- Special Feature: Event System for inter-peripheral signalling
- Special Feature: Support for capacitive touch interfaces
- Special Feature: Independent clock domains for power optimisation
- of Pins: 48Pins
- of I/O's: 38I/O's
- Supply Voltage Min: 1.62V
- Supply Voltage Max: 3.63V
- Operating Temperature Min: -40°C
- Operating Temperature Max: 85°C
- MCU Family: SAM32
- MCU Series: SAM D2X
- SVHC: No SVHC (04-Feb-2026)
Documents
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