Data Sheet

ams Datasheet Page 25

[v1-00] 2016-Dec-23 Document Feedback

CCS811 − Bootloader Register Overview

Registers not detailed below are documented in the

Application Register Overview section.

APP_ERASE (Application Erase) Register (0xF1)

To prevent accidental APP_ERASE a sequence of four bytes must

be written to this register in a single I²C sequence: 0xE7, 0xA7,

0xE6, 0x09.

The APP_ERASE can take a variable amount of time. The status

complete. The 6

bit (0x40) is initialised to 0 and set to a 1 on

completion of the APP_ERASE function. After an erase this bit

is only cleared by doing a reset or starting the application.

APP_DATA (Application Data) Register (0xF2)

Nine byte, write only register for sending small chunks of

application data which will be written in order to the CCS811

flash code.

APP_VERIFY (Application Verify) Register

(0xF3)

Single byte write only register which starts the application

verify process run by the bootloader to check for a complete

application code image. Command only needs to be called once

after a firmware download as the result is saved in a flash

location that gets checked during device initialisation.

The APP_VERIFY can take a variable amount of time. The status

complete. The 5

bit (0x20) is initialised to 0 and set to a 1 on

completion of the APP_VERIFY function. After an APP_VERIFY

this bit is only cleared by doing a reset or starting the

application.

For details on downloading new application firmware please

refer to application note ams AN000371.

APP_START (Application Start) Register (0xF4)

To change the mode of the CCS811 from Boot mode to running

the application, a single byte write of 0xF4 is required.

The CCS811 interprets this as an address write to select the

‘APP_START’ register and starts running the loaded application

software if it is a valid version (Refer to the STATUS Register

(0x00)).