Data Sheet

ams Datasheet Page 17

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

CCS811 − Application Register Overview

MEAS_MODE (Measurement and Conditions)

This is Single byte register, which is used to enable sensor drive

mode and interrupts.

Figure 13:

Measure Mode Register

765 4 3 210

- DRIVE_MODE INTERRUPT THRESH -

Bit(s) Field Description

7 - Reserved – write ‘0’

6:4 DRIVE_MODE

000: Mode 0 – Idle (Measurements are disabled in this mode)

001: Mode 1 – Constant power mode, IAQ measurement every second

010: Mode 2 – Pulse heating mode IAQ measurement every 10 seconds

011: Mode 3 – Low power pulse heating mode IAQ measurement every 60

seconds

100: Mode 4 – Constant power mode, sensor measurement every 250ms

1xx: Reserved modes (For future use)

In mode 4, the ALG_RESULT_DATA is not updated, only RAW_DATA; the processing

must be done on the host system.

A new sample is placed in ALG_RESULT_DATA and RAW_DATA registers and the

DATA_READY bit in the STATUS register is set at the defined measurement interval.

3INT_DATARDY

0: Interrupt generation is disabled

1: The nINT signal is asserted (driven low) when a new sample is ready in

ALG_RESULT_DATA. The nINT signal will stop being driven low when

ALG_RESULT_DATA is read on the I²C interface.

At the end of each measurement cycle (250ms, 1s, 10s, 60s) a flag is set in the

STATUS register regardless of the setting of this bit..

2INT_THRESH

0: Interrupt mode (if enabled) operates normally

1: Interrupt mode (if enabled) only asserts the nINT signal (driven low) if the new

ALG_RESULT_DATA crosses one of the thresholds set in the THRESHOLDS register

by more than the hysteresis value (also in the THRESHOLDS register)

1:0 - Reserved