ATECC608A datasheet(63/81 Pages) MICROCHIP

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The idle sequence consists of the proper device address followed by the value of 0x02 as the word address followed

by a Stop condition. It can be sent to the device at any time when it is awake and not busy.

7.5

I2C Transmission from the ATECC608A-TNGLoRaWAN

When the ATECC608A-TNGLoRaWAN is awake and not busy, the bus master can retrieve the current output buffer

contents from the device using an I2C read. If valid command results are available, the size of the group returned is

determined by the particular command which has been run. Otherwise, the size of the group (and the first byte

returned) will always be four: count, status/error, and 2-byte CRC. The bus timing is shown in Figure 8-2.

Table 7-3. I2C Transmission from the ATECC608A-TNGLoRaWAN

Name

I2C Name

Direction

Description

Device

Address

Device

Address

To slave

This byte selects a particular device on the I2C interface and ATECC608A-TNGLoRaWAN

will be selected if bits 1 through 7 of this byte match bits 1 through 7 of the I2C_Address

byte in the Configuration zone. Bit 0 of this byte is the standard I2C R/W pin, and should

be one to indicate that the bytes following the device address travel from the slave to the

master (read).

Data

Data1,N

To master

The output group, consisting of the count, status/error byte or the output packet followed

by the two-byte CRC. See Section 4.1 I/O Transactions.

The status, error, or command outputs can be read repeatedly by the master. Each time a Read command is sent to

the ATECC608A-TNGLoRaWAN along the I2C interface, the device transmits the next sequential byte in the output

buffer. See the following section for details on how the device handles the address counter.

If the ATECC608A-TNGLoRaWAN is busy, idle, or asleep, it will NACK the device address on a read sequence. If a

partial command has been sent to the device and a read sequence [Start + DeviceAddress(R/W == R)] is

sent to the device, then the ATECC608A-TNGLoRaWAN will NACK the device address to indicate that no data is

available to be read.

ATECC608A-TNGLoRaWAN

I2C Interface

Complete Datasheet

DS40002154B-page 63

ATECC608A Datasheet(PDF) 63 Page - Microchip Technology