HDPM01

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6. Pressure and Temperature Measurement

The main function of HDPM01 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 10 sensor-specific coefficients are stored on the HDPM01 at our manufacturing facility, and

they allow an accurate software compensation in the application.

The 7 coefficients are:

. Sensitivity coefficient

“C1”

. Offset coefficient

“C2”

. Temperature Coefficient of Sensitivity

“C3”

. Temperature Coefficient of Offset

“C4”

. Reference Temperature

“C5”

. Temperature Coefficient of Temperature

“C6”

. Offset Fine Tuning

“C7”

4 sensor parameter

. Sensor Specific Parameter

“A,B,C,D”

Note: Make sure to pull low XCLR before start to Read these coefficients or the data read out is

probably incorrect

Parameter Range(Hex:Dec)

C1

0x100 -- 0x7FFF

:

256 -- 65535

C2

0x00 -- 0xFFFF

;

0 -- 8191

C3

0x00 -- 0x400

;

0 -- 3000

C4

0x00 -- 0x1000

;

0 -- 4096

C5

0x1000 -- 0xFFFF

;

4096 -- 65535

C6

0x00 -- 0x4000

;

0 -- 16384

C7

0x960 -- 0xA28

;

2400 -- 2600

C,D

0x01 -- 0x0F

;

1 -- 15

A,B

0x01 -- 0x3F

;

1 -- 63

D1

0x00 -- 0xFFFF

;

0 -- 65535

D2

0x00 -- 0xFFFF

;

0 -- 65535