Datasheet

12
ENS160 Datasheet v0.95 preliminary / December 2020
7 Gas Sensor Raw Resistance Signals
For two of its sensing elements the ENS160 provides individual outputs of raw sensor values.
Table 8: Gas Sensor Raw Resistance Signals
Sensor
Raw Value
Range
Unit
Gen. Purpose Register
Comment
1
R1
raw
[0..65535]
-
GPR_READ[0:1]
Arbitrary logarithmic units -
no resistance values.
R
iraw
require conversion to
corresponding resistance
value R
ires
 (see below)
4
R4
raw
[0..65535]
-
GPR_READ[6:7]
Gas sensor raw-values R
iraw
can be 
(GPR_READ) for customer-specific signal post-processing.
Prior to use R
iraw
values require conversion to resistance values, using the following formula:


󰇟

󰇠
  



GPR_READ (Address 0x48  0x4F) on how to obtain AQI-values
from the ENS160.
The below figures show the response of eight ENS160s to various hydrogen concentration
1
steps (upper diagram) and the corresponding raw sensor resistance R
iraw
(lower diagram).
Figure 7: Raw Sensor Signal Response to Hydrogen
1
ppm (= parts per million) and ppb (= parts per billion) means volume fractions of the
respective gases in air: 1 ppm = 1 mL/m³ = 1000 ppb = 1000 µL/m³