ATSAMD21J18A-AF

Overview

The ATSAMD21J18A-AF is a microcontroller based on the ARM Cortex-M0+ core operating at up to 48 MHz. It integrates 256 KB of Flash memory and 32 KB of SRAM. The device features multiple communication interfaces including USB, SPI, I2C, UART, and CAN. It supports an operating voltage range from 1.62 V to 3.63 V. The component is housed in a 48-pin TQFP package with 39 general-purpose I/O pins.

Feature Summary

• Integrates a high-performance ARM Cortex-M0+ processor with single-cycle multiplication and hardware division
• Includes comprehensive peripheral sets such as USB Device/Host/OTG, CAN, and multiple serial communication controllers
• Features low-power operation modes including Idle, Sleep, and Standby for energy-efficient applications

Applications

• USB-enabled consumer electronics
• Industrial control systems requiring CAN bus connectivity
• Smart home devices and IoT nodes
• Medical equipment with low power requirements

Procurement Notes

Verify the specific suffix 'AF' corresponds to the required temperature grade and package variant. Confirm that the ordering part number matches the exact pin count and memory configuration. Check for any regional compliance certifications required for your target market. Ensure compatibility with existing PCB footprints before finalizing procurement decisions.

Selection Notes

Select this model when a balance of processing power and peripheral richness is needed within a compact form factor. The integrated USB and CAN interfaces reduce external component count compared to similar microcontrollers lacking these modules. Consider the 48 MHz clock speed sufficient for real-time control tasks without excessive power consumption.

Part Context

This component belongs to the Microchip SAM D21 family of 32-bit ARM Cortex-M0+ microcontrollers. The family is designed for cost-sensitive applications requiring efficient code execution and extensive connectivity options. The J18 variant specifically denotes the 256 KB Flash and 32 KB SRAM configuration within this series.

Replacement Considerations

Direct replacements include other SAM D21 variants with matching memory sizes or different packages. Cross-reference pinouts carefully when substituting with higher or lower density models. Verify software compatibility if migrating between different flash capacities within the same family.

FAQ

What is the maximum operating frequency of the CPU?

The ARM Cortex-M0+ core operates at a maximum frequency of 48 MHz.

Does this microcontroller support CAN bus communication?

Yes, the ATSAMD21J18A-AF includes an integrated CAN controller interface.