ATSAML21J18B-UUT

Overview

The ATSAML21J18B-UUT is an ARM microcontroller from the SAML21 series, featuring an ARM Cortex-M0 core with a 32-bit data bus. It operates within a voltage range of 1.62 V to 3.63 V and supports a maximum clock frequency of 48 MHz. The device includes 256 kB of Flash program memory and 32 kB of SRAM data RAM. It provides 51 I/O pins and integrates a 12-bit ADC with 20 channels. Communication interfaces include I2C, SPI, UART, and USART. The unit contains five timers/counters and is housed in a WLCSP-64 package, suitable for surface mount installation.

Feature Summary

• Integrates an ARM Cortex-M0 processor core for efficient code execution
• Includes advanced analog peripherals with a 12-bit ADC and multiple communication interfaces
• Offers flexible connectivity through I2C, SPI, UART, and USART support
• Designed for low-power applications with industrial temperature range operation

Applications

• Wearable electronic devices requiring compact form factors
• Industrial control systems needing reliable MCU performance
• Consumer electronics utilizing low-power ARM-based processing
• IoT sensor nodes requiring integrated analog-to-digital conversion

Procurement Notes

Verify the specific suffix UUT against official Microchip documentation to confirm package type and temperature grade. Confirm RoHS compliance status directly with the manufacturer or authorized distributors. Ensure that the ordering quantity aligns with factory reel specifications. Cross-reference the datasheet revision date to guarantee compatibility with current design requirements. Validate supply chain authenticity through authorized channels only.

Selection Notes

Select this component when a compact WLCSP package is required alongside standard ARM Cortex-M0 capabilities. Consider the 48 MHz speed and 256 kB Flash size for moderate complexity firmware tasks. Evaluate the 51 available I/O pins against system interface needs. Check if the 1.62 V to 3.63 V operating range matches the target power supply architecture. Compare pin count and peripheral sets against alternative SAML21 variants for optimal fit.

Part Context

This part belongs to the Microchip SAML21 family of low-power microcontrollers. These devices are designed for battery-powered applications requiring high efficiency. The SAML21 series integrates advanced analog features and security functions. It targets markets such as wearables, IoT, and industrial automation where space and power consumption are critical constraints.

FAQ

What is the maximum operating frequency of the ATSAML21J18B-UUT?

The maximum clock frequency is 48 MHz.

Does this MCU support USB connectivity?

The documented specifications list I2C, SPI, UART, and USART interfaces; USB is not explicitly listed in the provided parameter table.