BME688 datasheet(44/60 Pages) BOSCH

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Bosch Sensortec | BME688 Datasheet

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Modifications reserved |Data subject to change without notice | Printed in Germany

Document number: BST-BME688-DS000-03 Revision_1.3 022024

5.3.6.5 Gas valid status

In each TPHG sequence in parallel mode contains a gas measurement slot, either a real one which result is used or a

dummy one to keep a constant sampling rate and predictable device timing. A real gas conversion (i.e., not a dummy one)

is indicated by the gas_valid_r status register.

[Field]

Address

Content<bit position>

Description

gas_r_lsb [0]

gas_r_lsb [1]

gas_r_lsb [2]

0x2D

0x3E

0x4F

gas_valid_r<5>

Gas valid bit

5.3.6.6 Heater Stability Status

Heater temperature stability for target heater resistance is indicated heat_stab_x status bits and updated with data

registers.The heater stability flag behavior depends on the current device mode:

• Forced mode: Stability is monitored only during the auto ranging sequences for gas measurements.

• Parallel mode: Stability is monitored from the beginning of the last one TPHG sequence (the on

containing the real gas measurements) to the end of the gas measurement.

[Field]

Address

Content<bit position>

Description

gas_r_lsb [0]

gas_r_lsb [1]

gas_r_lsb [2]

0x2D

0x3E

0x4F

heat_stab_r<4>

Heater stability bit

5.3.6.7 Sub Measurement Index

Indicates current TPHG sequence number on operating sensor on parallel mode, which are incremented for each TPHG

measurement. These status bytes form “virtual time sensor” and contain a snapshot of the internal 8 bit conversion counter

since the last change of device mode.

[Field]

Address

Content<bit position>

Description

sub_meas_index [0]

sub_meas_index [1]

sub_meas_index [2]

0x1E

0x2F

0x40

sub_meas_index<7:0>

TPHG measurement sequence number

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