ATECC608A datasheet(7/81 Pages) MICROCHIP

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2.1

ATECC608A-TNGLoRaWAN Configuration Zone

The ATECC608A-TNGLoRaWAN is largely fixed and cannot be modified by the customer. When using the Microchip

Trust Platform Suite, all configuration information is taken into account by the tools. Relevant Information about how

the device is configured is shown below or in the slot information.

Device Configuration Information

• The serial number for each device is unique and stored in configuration zone bytes [0:3,8:12]. Serial number

bytes [0:1] are 0x01 0x23. Serial number byte[8] is dependent on the vendor. Note that the serial number stored

in the configuration zone is split and configuration zone byte[12] maps to the vendor specific serial number

byte[8].

– For TTN byte[8] = 27

– For Actility byte[8] = 10

All other serial number bytes are unique.

• The default 7-bit I2C address is 0x59. The I2C address can be overwritten using the UpdateExtra command.

Important: The default I2C address of the ATECC608A-TNGLoRaWAN is not the same as that of

the generic non-configured ATECC608A device.

• The I/O levels are set to a fixed reference level and, therefore, the micro can operate at a lower voltage than the

ATECC608A-TNGLoRaWAN.

• The watchdog timer is set to a max timeout of 1.3s.

• The use of an I/O Protection key is enabled and stored in Slot 14.

• Slot locking is possible for some of the slots of the ATECC608A-TNGLoRaWAN. For the ATECC608A-

TNGLoRaWAN, the following individual slots may be locked: Slots 8, 10 and 14.

• Monotonic counters are available for use by the system and are not attached to any keys.

• The Health Test Failure bit is cleared after any time that a command fails as a result of a health test failure. If the

failure symptom was transient, the command may pass when run a second time.

• AES Operations are enabled.

• The KDF AES mode is enabled and the output of the KDF command is encrypted by the I/O Protection Key

stored in Slot 14.

• Output of the ECDH command is encrypted by the I/O Protection Key stored in Slot 14..

2.1.1

Modifiable Configuration Zone Bytes

No bytes within the Configuration zone can be directly written since the Config zone has already been locked.

Several bytes can still be modified through the use of other commands.

SlotLocked Bits

For the ATECC608A-TNGLoRaWAN, the following individual slots may be locked: Slots 8, 10 and 14. These can be

locked through the SlotLock mode of the Lock command. Each slot where this feature is enabled can be individually

locked just once. Once a slot has been locked, it can never be modified or unlocked but can still be used based on

the Access Policies defined for that slot.

Bytes 88 and 89 store the SlotLocked bytes. Initially, all bits in these bytes are set to a value of one. For those slots

that have been locked, the value of the respective bit will be set to a value of zero.

I2C Address Redefinition

This device configuration has been created such that the I2C address can be redefined one time. The UpdateExtra

command can be used to rewrite byte 85 of the Configuration zone to a new I2C address. When this byte is set to a

non-zero value, the device configuration uses byte 85 as its I2C address instead of the default address. Once this

byte has been rewritten, the device must be powered-down or put into Sleep mode before this change takes effect.

ATECC608A-TNGLoRaWAN

EEPROM Memory and Data Zone Access Policies

Complete Datasheet

DS40002154B-page 7

ATECC608A Datasheet(PDF) 7 Page - Microchip Technology

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