HP01-JK Datasheet, PDF (3/7 Pages) List of Unclassifed Manufacturers – Low voltage, low power

Hope RF
BAROMETER MODULE
2010-6-3
PRELIMINARY
Pressure and Temperature Output Characteristics
HP01-JK
Version2.1
HP01 system is able to reach the following characteristics:
Parameter
Resolution
Accuracy
Symbol Conditions Min
0.1
900-1100
-8
Pressure Sensitivity
SNS 900-1100
25
Maximum Error Over Temperature
Long Term Stability
VDD Dependency
Temperature coefficient of sensitivity
TCS
0~+55
12 month
2.0~5.0
-5.0
-1.5
-0.45
Typ
27
1
0
-0.55
Max
Unit
hpa
+10
hpa
30
Cnts/mbar
5.0
hpa
hpa
1.5
hpa
-0.6 ^{∆D1∆D2ï€} 
Pressure Measurement
The main function of HP01 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
“D2”
. measured pressure
“D1”
As the sensor is strongly temperature dependent, it is necessary to compensate for these
effects. Therefore necessary temperature compensation is needed to achieve nominal
accuracy.
Pressure and Temperature Compensation Calculation:
The following information is just a guide line for temperature
compensate, the end user of this module should not be confined
to this method. Many other methods can be deployed to achieve
best accuracy.
Step 1: (set relative pressure starting reference point, normally this step be done after
power up or reset relative pressure)
P0=1013.2hp
D1(P0)=D1
D2(P0)=D2
Step 2: (normal pressure calculation with first order temperature compensation)
dUT=D2-D2(P0)
dTCS=TCS*dUT
dUP=D1-dTCS-D1(P0)
P2=dUP/SNS
P=P0+P2
; calculate current temperature difference with reference temperature
; calculate compensated pressure offset with temperature coefficients
; calculate temperature compensated pressure reading
; calculate pressure difference referred to starting pressure P0
; calculate current relative pressure
3