• Added self test command, optional automatic power-on self test

• Unaligned public key for built-in X.509 cert key validation

• Optional power reduction at increased execution time

• Programmable I2C address after data (secret) zone lock

Features Eliminated in ATECC608B vs. ATECC508A

• HMAC command removed, replaced via new more powerful SHA command

• OTP consumption mode eliminated, now read only

• Pause command eliminated along with related Selector function in UpdateExtra

• Slot 15 special limited use eliminated, replaced with standard monotonic counter limited use

• SHA command no longer uses TempKey during the digest calculation and the result in TempKey is unchanged

throughout the SHA operation. TempKey can however still be used to initialize the SHA for the HMAC_Start or to

store the final digest.

3.3

Microchip ATSHA204A, ATECC108A

The ATECC608B is generally compatible with all ATSHA204/A and ATECC108/A devices. If properly configured, it

can be used in most situations where these devices are currently employed. For ATSHA204A and ATECC108A

compatibility restrictions, see the ATECC508A data sheet.

ATECC608B

Compatibility

© 2020 Microchip Technology Inc.

Summary Datasheet

DS40002239A-page 13