HP02S Datasheet, PDF (3/6 Pages) List of Unclassifed Manufacturers – One hardware controlled reset line

Hope RF
2011-6-8
BAROMETER MODULE
HP02S
Version: 1.4
Pressure and Temperature Measurement
The main function of HP02S system is to convert the uncompensated pressure and
temperature signal from a pressure sensor. After the conversion, the following two values
can be obtained:
. measured temperature
“T1”
. measured pressure
“D1”
As the sensor is strongly temperature dependent, it is necessary to compensate for these
effects. Therefore 5 sensor-specific coefficients are stored on the HP02S at our
manufacturing facility, and they allow an accurate software compensation in the
application.
The 5 coefficients are:
. “D0”: Offset of pressure coefficient.
. “T0”: Offset temperature.
. “P0”: Offset fine tuning of pressure.
. “S”: Temperature coefficient of sensitivity.
. “C”: Constant parameter for each sensor.
Note: Make sure to pull low XCLR before start to Read these coefficients or the data read
out is probably incorrect
Pressure and Temperature Calculation:
Step 1: (calculate offset, sensitivity and final pressure value)
dUP=D1-D0
dUT=(29*(T1-T0)/50-(T1-T0)^2/76666)*S/C
P=P0+100*(dUP+dUT)/S
Example:
D0=41058
T0=32819
P0=10143
S=294
C=320
D1=42920
T1=29889
dUP = 42920-41058 =1862
dUT=(29*(29889-32819)/50-(29889-32819)^2/76666)*294/320=-1664
P=10143+100*(1862-1664)/294=10210=1021.0hpa
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