User Manual

Page 18 ams Datasheet

Document Feedback [v1-06] 2019-Feb-07

CCS811 − Application Register Overview

STATUS Register (0x00)

Single byte read only register which indicates if a device is

active, if new data is available or if an error occurred.

Figure 15:

Status Register

76 5 4 3210

FW_MODE APP_ERASE APP_VERIFY APP_VALID DATA_READY - ERROR

Bit(s) Field Description

7FW_MODE

0: Firmware is in boot mode, this allows new firmware to be loaded

1: Firmware is in application mode. CCS811 is ready to take ADC measurements

6APP_ERASE

Boot Mode only.

0: No erase completed

1: Application erase operation completed successfully (flag is cleared by APP_DATA

and also by APP_START, SW_RESET, nRESET and APP_VERIFY)

After issuing the ERASE command the application software must wait 500ms

before issuing any transactions to the CCS811 over the I

C interface.

5 APP_VERIFY

Boot Mode only.

0: No verify completed

1: Application verify operation completed successfully (flag is cleared by

APP_START, SW_RESET and nRESET)

After issuing a VERIFY command the application software must wait 70ms before

issuing any transactions to CCS811 over the I²C interface

4APP_VALID

0: No application firmware loaded

1: Valid application firmware loaded

3 DATA_READY

0: No new data samples are ready

1: A new data sample is ready in ALG_RESULT_DATA, this bit is cleared when

ALG_RESULT_DATA is read on the I²C interface

2:1 - Reserved

0ERROR

This bit is cleared by reading ERROR_ID (it is not sufficient to read the ERROR field of

ALG_RESULT_DATA and STATUS )

0: No error has occurred

1: There is an error on the I²C or sensor, the ERROR_ID register (0xE0) contains the

error source