BME-688 Heater profile Duration

[Shapna]

There are different heater profiles available in the BME688 sensor each with different duration. For example 

HP- 001	600.6
HP- 301	18.34
HP- 321	18.9
HP- 322	27.44

Each of these heater profiles have 10 steps.
Now how is this duration related with the duty cycles?

[BSTRobin · Accepted solution]

Hi Shapna,

You could refer application note from page 18 to page 20 https://www.bosch-sensortec.com/media/boschsensortec/downloads/application_notes_1/bst-bme688-an001....
A duty cycle includes scanning cycles and sleeping cycles. A duty cycle can contain one or more scanning cycles, as well as one or more sleeping cycles.
Each scanning cycle can be viewed as one iteration of a heater profile. Therefore, the duration of each scanning cycle is derived from the duration of the heater profile used.

[Shapna]

Can you explain what this temperature time vector means in the data collected? I understand the temperature part, but the time is pre-determined and how does timebase of 140ms reflect on this?

"temperatureTimeVectors": [
[
210,
32
],
[
280,
2
],
[
280,
30
],
[
350,
2
],
[
350,
30
],
[
280,
32
],
[
210,
32
],
[
140,
32
],
[
70,
32
],
[
140,
32
]
]
}
],