ATSHA204A datasheet(3/93 Pages) MICROCHIP

3 / 93 page

Table of Contents

Features.......................................................................................................................... 1

Applications..................................................................................................................... 1

Package Types................................................................................................................2

1. Introduction................................................................................................................5

1.1.

Applications.................................................................................................................................. 5

1.2.

Device Features........................................................................................................................... 5

1.3.

Cryptographic Operation.............................................................................................................. 6

2. Device Organization.................................................................................................. 8

2.1.

EEPROM Organization................................................................................................................ 8

2.2.

Static RAM (SRAM)....................................................................................................................17

3. Security Features.................................................................................................... 19

3.1.

Physical Security........................................................................................................................ 19

3.2.

Random Number Generator (RNG)........................................................................................... 19

4. General I/O Information........................................................................................... 20

4.1.

Byte and Bit Ordering................................................................................................................. 20

5. Single-Wire Interface............................................................................................... 22

5.1.

I/O Tokens.................................................................................................................................. 22

5.2.

I/O Flags.....................................................................................................................................23

5.3.

Synchronization..........................................................................................................................24

5.4.

Sharing the Interface.................................................................................................................. 24

5.5.

Transaction Example..................................................................................................................25

5.6.

Wiring Configuration for Single-Wire Interface........................................................................... 26

6. I2C Interface.............................................................................................................28

6.1.

I/O Conditions.............................................................................................................................28

6.2.

I2C Transmission to the ATSHA204A Device.............................................................................30

6.3.

I2C Transmission from the ATSHA204A Device.........................................................................32

6.4.

Address Counter........................................................................................................................ 32

6.5.

I2C Synchronization....................................................................................................................33

6.6.

Transaction Example..................................................................................................................34

7. Electrical Characteristics......................................................................................... 35

7.1.

Absolute Maximum Ratings........................................................................................................35

7.2.

Reliability.................................................................................................................................... 35

7.3.

AC Parameters — All I/O Interfaces...........................................................................................35

7.4.

DC Parameters — All I/O Interfaces.......................................................................................... 39

8. Security Commands................................................................................................ 42

DS40002025A-page 3

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