ATSAMD21J16B-MU

Overview

The ATSAMD21J16B-MU is a 32-bit microcontroller from Microchip Technology's SAM D21J series, featuring an ARM Cortex-M0+ core. It operates at up to 48MHz and includes 64KB of Flash memory and 8KB of SRAM. The device supports a supply voltage range of 1.62V to 3.6V and functions within a temperature range of -40°C to 85°C. It integrates multiple communication interfaces including USB, I2C, SPI, UART/USART, and LINbus. The component is housed in a 64-QFN (9x9) package with 52 available I/O pins.

Feature Summary

• Functional Safety (FuSa) compliant design for safety-critical applications
• Integrated full-speed USB device and embedded host capabilities
• Advanced analog peripherals including multiple 12-bit ADCs and a 10-bit DAC
• Direct Memory Access (DMA) controller for efficient data transfer

Applications

• Industrial control systems requiring functional safety standards
• Consumer electronics with USB connectivity requirements
• Smart metering and utility monitoring devices
• Home automation controllers

Procurement Notes

Verify the specific suffix 'MU' against official Microchip documentation to confirm package type and temperature grade. Ensure compatibility with existing PCB footprints for the 64-QFN form factor. Cross-reference the Functional Safety qualification status if deploying in safety-rated environments. Confirm that the internal oscillator meets system timing accuracy requirements without external crystals.

Selection Notes

Select this model when a balance of low power consumption and functional safety certification is required. The 64KB Flash capacity suits moderate firmware complexity. Consider the 64-QFN package constraints for thermal management and assembly density. Evaluate the 52 I/O count against interface needs before choosing higher-capacity variants like the ATSAMD21J17.

Part Context

This component belongs to the SAM D21 family, which provides pin-compatible options across G, J, and T sub-series. The 'A' or 'B' designation typically indicates silicon revision or specific manufacturing lot characteristics rather than functional differences. The SAM D21 series is designed for low-power applications using advanced CMOS technology.

Replacement Considerations

ATSAMD21J16B-MMZ offers identical electrical specifications but utilizes a tray packaging format instead of tape and reel.