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Document number: BST-BME690-DS001-04

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Status registers

The measured data are stored into the output data registers at the end of each TPHG conversion phase along with status

flags and index of measurement

5.3.6.1 New data status

[Field]

Address

Content<bit position>

Description

meas_status [0]

meas_status [1]

meas_status [2]

0x1D

0x2E

0x3F

new_data<7>

New data flag indicate that data field contains a

new data, not already read-out.

5.3.6.2 Gas measuring status

Measuring bit is set to 1 only during gas measurements, goes to 0 as soon as measurement is completed and data

transferred to data registers. The registers storing the configuration values for the measurement (gas_wait_shared,

gas_wait_x, res_heat_x, idac_heat_x, image registers) should not be changed when the device is measuring.

[Field]

Address

Content<bit position>

Description

meas_status [0]

meas_status [1]

meas_status [2]

0x1D

0x2E

0x3F

gas_measuring<6>

Gas measuring status flag

5.3.6.3 Measuring status

Measuring status will be set to ‘1’ whenever a conversion (temperature, pressure, humidity and gas) is running and back to

‘0’ when the results have been transferred to the data registers.

[Field]

Address

Content<bit position>

Description

meas_status [0]

meas_status [1]

meas_status [2]

0x1D

0x2E

0x3F

measuring<5>

Measuring status flag

5.3.6.4 Gas Measurement Index

User can trigger a heater profile of up to 10 heater steps by setting nb_conv<3:0>(see 5.3.4.6).

Each heater step in profile has specific heater temperature and heater-on time and gas_meas_index register stores index

of heater step (up to 10 steps numbered from 0 to 9) corresponding to TPHG data

[Field]

Address

Content<bit position>

Description

meas_status [0]

meas_status [1]

meas_status [2]

0x1D

0x2E

0x3F

gas_meas_index_0<3:0>

Gas measurement index

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.

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