ATSAMD21G18A-AF

Overview

The ATSAMD21G18A-AF is a 32-bit microcontroller from Microchip Technology's SAM D21G series, featuring an ARM Cortex-M0+ core. It integrates 256KB of Flash memory and 32KB of SRAM. The device operates at a maximum frequency of 48MHz with a supply voltage range of 1.6V to 3.6V. It includes advanced analog peripherals such as 14x12-bit ADCs and a 1x10-bit DAC. Connectivity options include I2C, SPI, UART/USART, USB, and LINbus. The component is housed in a 48-TQFP package and supports industrial temperature ranges.

Feature Summary

• Integrates an ARM Cortex-M0+ processor for efficient code execution and low power consumption.
• Includes functional safety features compliant with ISO 26262 standards.
• Provides versatile communication interfaces including USB and standard serial protocols.
• Features high-resolution analog-to-digital converters and digital-to-analog converters.

Applications

• Industrial control systems requiring functional safety compliance
• Portable data logging devices
• IoT edge nodes for sensor data aggregation
• Wireless modules combining Wi-Fi connectivity with MCU processing

Procurement Notes

Verify the specific suffix 'AF' against official Microchip documentation to confirm package type and temperature grade. Ensure compatibility with existing PCB footprints for the 48-TQFP configuration. Confirm that the selected variant meets all required environmental and electrical specifications for the target application before finalizing procurement.

Selection Notes

Select this component when a balance of performance and power efficiency is required for embedded applications. The Cortex-M0+ architecture offers sufficient processing power for complex logic while maintaining low energy usage. Consider the integrated analog peripherals if signal conditioning is needed without external components. Verify that the 256KB Flash capacity accommodates the firmware size and any necessary data storage requirements.

Part Context

This microcontroller belongs to the SAM D21G family, which emphasizes functional safety for automotive and industrial markets. It shares architectural similarities with other SAM D21 variants but includes specific safety mechanisms. The device is designed to replace older 8-bit architectures in applications demanding higher performance and advanced peripheral integration.

Replacement Considerations

Direct substitutes within the same family include ATSAMD21G18A-AU or ATSAMD21G18A-MU, depending on the required package style. Cross-referencing pinouts and electrical characteristics is essential when considering alternative packages or temperature grades.