Data Sheet

Page 24 ams Datasheet

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CCS811 − Bootloader Register Overview

All I²C transactions must use the (7bits) slave address 0x5A or

0x5B depending on status of ADDR pin when writing to and

reading from the CCS811. Figure 23 shows the bootloader

Figure 23:

CCS811 Bootloader Register Map

Note(s):

1. The number of bytes read from a register must not exceed the size in this table.

2. For more information on performing application code download please refer to application note ams AN000371.

Address Register R/W Size Description

0x00 STATUS R 1 byte Status register

0x20 HW_ID R 1 byte Hardware ID. The value is 0x81

0x21 HW Version R 1 byte Hardware Version. The value is 0x1X

0x23 FW_Boot_Version R 2 bytes

Firmware Boot Version. The first 2 bytes contain the

firmware version number for the boot code.

0x24 FW_App_Version R 2 bytes

Firmware Application Version. The first 2 bytes contain

the firmware version number for the application code.

0xE0 ERROR_ID R 1 byte

Error ID. When the status register reports an error it

source is located in this register

0xF1 APP_ERASE W 4 bytes

If the correct 4 bytes (0xE7 0xA7 0xE6 0x09) are written

to this register in a single sequence the device will start

the application erase

0xF2 APP_DATA W 9 bytes

Transmit flash code for the bootloader to write to the

application flash code space.

0xF3 APP_VERIFY W -

Starts the process of the bootloader checking though

the application to make sure a full image is valid.

0xF4 APP_START W -

Application start. Used to transition the CCS811 state

from boot to application mode, a write with no data is

required. Before performing a write to APP_START the

Status register should be accessed to check if there is a

valid application present.

0xFF SW_RESET W 4 bytes

If the correct 4 bytes (0x11 0xE5 0x72 0x8A) are written

to this register in a single sequence the device will reset

and return to BOOT mode.

Bootloader Register Overview