ATECC508A datasheet(93/109 Pages) MICROCHIP

93 / 109 page

10.

Compatibility

10.1

Microchip ATSHA204A

ATECC508A is fully compatible with the ATSHA204 and ATSHA204A devices. If properly configured, it

can be used in all situations where the ATSHA204 or ATSHA204A is currently employed. Because the

configuration zone is larger, the personalization procedures for the device must be updated when

personalizing the ATSHA204 or ATSHA204A. For proper compatibility, care should be taken with the

KeyType, ReqRandom, and ReqAuth slots containing keys that are used with ATSHA204 or ATSHA204A

sequences.

10.2

Microchip ATECC108A

ATECC508A is designed to be fully compatible with the ATECC108 and ATECC108A devices. If properly

configured, it can be used in all situations where ATECC108 is currently employed. In many situations,

the ATECC508A can also be used in an ATECC108 application without change. The new revisions

provide significant advantages as outlined below:

•

Additional Features in ATECC508A vs. ATECC108A

–

ECDH Command

–

High Endurance Monotonic Counters

–

Public Key Invalidation via Certificate

•

Minor Changes

–

The GenDig command verifies that a random nonce is used when generating transport keys

–

The Info command DevRev mode now returns 0x1005 for ATECC108A and 0x5000 for

ATECC508A. This value should not be used in the software as it will vary with each minor

revision.

ATECC508A

Compatibility

Datasheet Complete

DS20005927A-page 93

ATECC508A Datasheet(PDF) 93 Page - Microchip Technology