ATECC508A datasheet(13/109 Pages) MICROCHIP

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2.2

EEPROM Configuration Zone

The 128 bytes in the configuration zone contain the manufacturing identification data, general device and

system configuration information, and access policy control values for the slots within the Data zone. It is

organized as four blocks of 32 bytes each. The values of these bytes can always be obtained using the

Read command. The bytes of this zone are arranged as shown the table below:

Table 2-5. Configuration Zone

Byte

Name

Description

Write

Read

0–3

SN<0:3>

Part of the serial number value. See Section Special Memory

Values in the Config Zone (Bytes 0 through 12).

Never

Always

4–7

RevNum

Device revision number. See Section Special Memory Values in the

Config Zone (Bytes 0 through 12).

Never

Always

8–12

SN<4:8>

Part of the serial number value. See Section Special Memory

Values in the Config Zone (Bytes 0 through 12).

Never

Always

Reserved

Set by Microchip.

Never

Always

I2C_Enable

Bits 7-1: Set by Microchip and cannot be changed. The value in

these bits will vary and software should not depend on

any particular state.

Bit 0:

0 = The device operates in Single-Wire Interface mode.

1 = The device operates in I2C interface mode.

Never

Always

Reserved

Set by Microchip.

Never

Always

I2C_Address I2C Mode: I2C_Enable<0> is one, this field is the I2C_Address with

a default value of 0xC0.

Bits 7-1: For I2C interface parts the most significant seven bits of

this byte form the Device Address value to which this

device will respond.

Bit 0:

RFU must be zero.

Single Wire Interface Mode: I2C_Enable<0> is zero.

Bits 7-4: SignalKey/KeyID.

If GPIO_Mode is 01, the slot number for the GPIO

authorizing key. For all other modes, must be 0b0000.

Bit 3:

Selects between the authorization modes. Must be zero

if GPIO_Mode is not 01.

0 = Authorization Output mode. When an

authorization is successfully performed on the slot

in SignalKey, the SCL pin is asserted.

1 = Intrusion Detection mode. Intrusion latch is set via

authorization and cleared if SCL falls.

Bit 2:

Default state of SCL pin on power-up when configured

as an output.

If Config

unlocked

Always

ATECC508A

Device Organization

Datasheet Complete

DS20005927A-page 13

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