ATSAML21E18B-MUT

Overview

The ATSAML21E18B-MUT is a 32-bit microcontroller from the SAM L21 series, featuring an ARM Cortex-M0+ processor with a maximum operating frequency of 48MHz. It integrates 256KB of in-system self-programmable Flash memory and 32KB of SRAM Main Memory. The device operates within a voltage range of 1.62V to 3.63V and supports up to 25 programmable I/O pins. Key peripherals include a 12-bit ADC with 10 channels, two 12-bit DACs, USB 2.0 interface, and AES encryption engine.

Feature Summary

• Ultra-low-power architecture with SleepWalking capabilities for peripheral-driven wake-up
• Integrated touch controller supporting capacitive interfaces with proximity sensing
• Flexible event system enabling inter-peripheral signaling without CPU intervention
• Hardware-accelerated security features including AES engine and True Random Generator

Applications

• Battery-powered wearable devices requiring low standby current
• Industrial control systems utilizing PWM and timer/counters
• USB-enabled consumer electronics and host/device applications
• Smart home sensors with capacitive touch user interfaces

Procurement Notes

Verify the specific ordering code against the manufacturer's official documentation to ensure correct package type and temperature grade. Confirm that the 'M' suffix corresponds to the QFN package and 'U' indicates the specified plating option. Cross-reference the device identification register values if software compatibility with other SAM L21 variants is required.

Selection Notes

Select this component when 256KB of Flash and 32KB of RAM are necessary for complex firmware execution. The 32-pin QFN package is suitable for space-constrained designs. Ensure the application benefits from the 48MHz processing speed and the extensive analog peripheral set, including the high-speed ADC and operational amplifiers.

Part Context

This part belongs to the SAM L21 family, designed for easy migration from the SAM D family with pin-compatible paths. It shares identical peripheral modules and linear address maps across the series. The device supports hex-compatible code, facilitating development transitions between different memory configurations within the same product line.

Replacement Considerations

ATSAML21E17B-MUT (128KB Flash)

FAQ

Does the ATSAML21E18B-MUT support on-the-fly performance level selection?

Yes, the device includes two selectable performance levels (PL0 and PL2) allowing users to scale the lowest core voltage level to support the operating frequency.

What is the maximum resolution supported by the ADC through oversampling?

The 12-bit ADC supports hardware oversampling and decimation to achieve resolutions of up to 16 bits.