ATECC508A datasheet(4/109 Pages) MICROCHIP

4 / 109 page

3.2.8.

Transport Keys.............................................................................................................32

3.2.9.

Authorized Keys...........................................................................................................32

3.3.

Security Features....................................................................................................................... 33

3.3.1.

Physical Security......................................................................................................... 33

3.3.2.

Random Number Generator (RNG).............................................................................33

4. General I/O Information........................................................................................... 34

4.1.

Byte and Bit Ordering................................................................................................................. 34

4.1.1.

ECC Key Formatting....................................................................................................34

4.2.

Sharing the Interface.................................................................................................................. 35

5. Single-Wire Interface............................................................................................... 37

5.1.

I/O Tokens.................................................................................................................................. 37

5.2.

I/O Flags.....................................................................................................................................38

5.3.

Synchronization..........................................................................................................................38

5.3.1.

I/O Timeout.................................................................................................................. 38

5.3.2.

Synchronization Procedures........................................................................................39

6. I2C Interface.............................................................................................................40

6.1.

I/O Conditions.............................................................................................................................40

6.1.1.

Device is Asleep.......................................................................................................... 40

6.1.2.

Device is Awake.......................................................................................................... 40

6.2.

I2C Transmission to ATECC508A...............................................................................................42

6.2.1.

Word Address Values.................................................................................................. 42

6.2.2.

Command Completion Polling..................................................................................... 43

6.3.

Sleep Sequence......................................................................................................................... 43

6.4.

Idle Sequence............................................................................................................................ 43

6.5.

I2C Transmission from the ATECC508A.................................................................................... 44

6.6.

Address Counter........................................................................................................................ 44

6.7.

SMBus Timeout..........................................................................................................................45

6.8.

I2C Synchronization....................................................................................................................45

7. General Purpose I/O Pin......................................................................................... 47

8. Electrical Characteristics......................................................................................... 49

8.1.

Absolute Maximum Ratings........................................................................................................49

8.2.

Reliability.................................................................................................................................... 49

8.3.

AC Parameters: All I/O Interfaces.............................................................................................. 49

8.3.1.

AC Parameters: Single-Wire Interface.........................................................................50

8.3.2.

AC Parameters: I2C Interface...................................................................................... 52

8.4.

DC Parameters: All I/O Interfaces.............................................................................................. 53

8.4.1.

VIH and VIL Specifications............................................................................................53

9. Security Commands................................................................................................ 55

9.1.

I/O Groups..................................................................................................................................55

9.1.1.

Security Command Packets........................................................................................ 55

9.1.2.

Status/Error Codes...................................................................................................... 56

9.1.3.

Command Opcodes, Short Descriptions, and Execution Times..................................57

ATECC508A

Datasheet Complete

DS20005927A-page 4

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