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HP203B Datasheet(PDF) 12 Page - List of Unclassifed Manufacturers

Part No. HP203B
Description  PRECISION BAROMETER AND ALTIMETER SENSOR
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DataSheet
HP203B
Plocal has unit in mbar, Aoffset has unit in meter
Plocal
1000
1001
1002
1003
Aoffset
‐111.18
‐102.73
‐94.29
‐85.85
Plocal
1004
1005
1006
1007
Aoffset
‐77.43
‐69.02
‐60.62
‐52.23
Plocal
1008
1009
1010
1011
Aoffset
‐43.84
‐35.47
‐27.11
‐18.76
Plocal
1012
1013
1014
1015
Aoffset
‐10.41
‐2.08
6.24
14.56
Plocal
1016
1017
1018
1019
Aoffset
22.86
31.15
39.44
47.71
Plocal
1020
1021
1022
1023
Aoffset
55.98
64.23
72.48
80.71
Plocal
1024
1025
1026
Aoffset
88.94
97.16
105.36
If the users find out that the value of Plocal is an integer, they can directly obtain the corresponding
altitude offset value in the above table; if the Plocal has decimal numbers and the value is larger than P1
and smaller than P2 (P1 and P2 are two adjacent pressure values in the table), the user shall first
obtain the corresponding altitude offset value A1 and A2 in the table, than use either of the following
two formulas to calculate the desired altitude offset value A:
A = A1 + 8.326 x (Plocal – P1), or A = A2 - 8.326 x (P2 – Plocal)
For example, the Plocal is 1016.4 mbar, which is between 1016 mbar (P1) and 1017 mbar (P2). Looking up
the table, A1 is 22.86 m and A2 is 31.15 m. Thus:
A = 22.86 + 8.326 x (1016.4 – 1016) = 26.19 m, or A = 31.15 - 8.326 x (1017 – 1016.4) = 26.15 m
Either of the results is acceptable. After obtaining the value of A, no matter by looking up the table
directly or by calculation, the user shall multiply the A by 100 in order to convert the unit from
meter to centimeter.
Finally, convert the result to a 2’s complement number to obtain ALT_OFF, and fill it into the two
registers. The following table shows 2 examples with the calculated altitude offsets and their
corresponding values to fill into the two registers.
HP203B_DataSheet_EN_V2.0
www.hoperf.com
12 / 18
Offset
Hex Value
ALT_OFF_MSB
ALT_OFF_LSB
50.02 m
0x138A
0x13
0x8A
-100.05 m
0XD8EB
0xD8
0xEB
For Example:
6.2 Setup the Events Detection Parameters
6.2.1 PA_H_TH_LSB, PA_H_TH_MSB - (RW)
The two registers form the 16-bit value of PA_H_TH which saves the pressure (or altitude) upper
bound threshold for event detection. When the PA_MODE bit in the INT_CFG register is set to 0, the
contents stored in these registers are the pressure thresholds. Its value should be a 16-bit unsigned


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