ATSAML21J18B-AUT

Overview

The ATSAML21J18B-AUT is a Microchip Technology microcontroller from the SAML21 series, featuring an ARM Cortex-M0+ core. It integrates 256 kB of flash memory and 32 kB of SRAM within a 64-pin TQFP package. The device operates on a supply voltage range of 1.62 V to 3.63 V and supports a maximum clock frequency of 48 MHz. It provides 51 I/O pins and includes interfaces such as I2C, LIN, SPI, USART, and USB. The unit offers 10 ADC channels with 12-bit resolution and six timer/counters, functioning reliably in industrial temperatures from -40°C to +85°C.

Feature Summary

• Integrates functional safety capabilities compliant with ISO 26262 standards for automotive applications.
• Features a low-power architecture optimized for battery-operated devices with multiple sleep modes.
• Includes a comprehensive set of analog peripherals including high-speed ADCs and DACs.

Applications

• Automotive body electronics and infotainment systems
• Industrial control and automation modules
• Smart home appliances and IoT gateways

Procurement Notes

Verify the specific suffix against official Microchip documentation to confirm package type and temperature grade. Confirm RoHS compliance status through current datasheets. Check for any recent product change notices affecting pinout or electrical characteristics before finalizing procurement specifications.

Selection Notes

Select this component when functional safety requirements dictate the use of the SAML21 family. Ensure the design accommodates the 64-TQFP footprint and 1.62V to 3.63V power domain. Compare against the ATSAMC21 series if higher voltage tolerance or different peripheral sets are required for the target application environment.

Part Context

This part belongs to the SAML21 family, which extends the SAM D21 line with added functional safety features. It shares architectural similarities with other SAML21 variants but differs in memory size and package configuration. The series targets cost-sensitive applications requiring robust performance and safety certification.

Replacement Considerations

ATSAML21J18B-MUT (VQFN-64 package variant)

FAQ

What is the primary difference between the ATSAML21J18B-AUT and the ATSAMC21J18A-AUT?

The ATSAML21J18B-AUT operates on a lower voltage range (1.62V–3.63V) compared to the ATSAMC21J18A-AUT (2.7V–5.5V). Additionally, the SAML21 series includes specific functional safety features not present in the standard C21 series.

Does the ATSAML21J18B-AUT support USB connectivity?

Yes, the datasheet confirms that the device includes a USB interface alongside other communication protocols like I2C, SPI, and USART.