ATSAML21J18B-MUT

Overview

The ATSAML21J18B-MUT is a 32-bit ARM Cortex-M0+ microcontroller from the SAML21 series, designed for functional safety applications. It features 256 kB of Flash memory and 32 kB of SRAM. The device operates at a maximum clock frequency of 48 MHz with a supply voltage range of 1.62 V to 3.63 V. It includes 51 I/O pins, a 12-bit ADC with 10 channels, and a 12-bit DAC. Communication interfaces include I2C, LIN, SPI, USART, and USB. The component is housed in a VQFN-64 package and supports an operating temperature range of -40°C to +85°C.

Feature Summary

• Integrated functional safety capabilities compliant with ISO 26262 standards for automotive applications.
• Supports low-power operation modes including Run, Idle, Sleep, Standby, and HIB to optimize energy consumption.
• Features hardware security mechanisms such as Read/Write Protection and JTAG security to protect intellectual property.

Applications

• Automotive body electronics and lighting control systems
• Industrial motor control and sensor interfaces
• Consumer devices requiring secure boot and data integrity

Procurement Notes

Verify the specific suffix 'MUT' corresponds to the VQFN-64 package and industrial temperature grade during sourcing. Confirm RoHS compliance status via the manufacturer's official documentation. Ensure ESD handling procedures are followed due to moisture sensitivity classification. Cross-reference the datasheet revision date to ensure compatibility with existing design files.

Selection Notes

Select this model when functional safety certification (ASIL B) is required alongside standard MCU performance. Compare against ATSAMD21J18A if safety features are unnecessary, or ATSAML21J17B if reduced memory suffices. Consider the VQFN-64 footprint constraints versus TQFP alternatives like ATSAML21J18B-AUT for board layout flexibility.

Part Context

This component belongs to the Microchip SAM L21 family, which extends the popular SAM D21 architecture with added functional safety features. It targets cost-sensitive automotive and industrial markets where reliability and security are critical. The SAML21 series shares pinouts and software compatibility with the SAM D21 series, facilitating migration from non-safety to safety-critical designs.

Replacement Considerations

ATSAML21J17B-MUT offers lower memory capacity (128 kB Flash, 16 kB SRAM). ATSAMD21J18A-MUT lacks functional safety features but shares similar memory and peripheral configurations. ATSAML21J18B-AUT provides the same functionality in a TQFP-64 package instead of VQFN-64.