HDPM01

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8

Pressure and Temperature Calculation:

Step 1: (get temperature value)

D2>=C5

dUT= D2-C5 - ((D2-C5)/2^7) * ((D2-C5)/2^7) * A / 2^C

D2 < C5

dUT= D2-C5 - ((D2-C5)/2^7) * ((D2-C5)/2^7) * B / 2^C

Step 2: (calculate offset, sensitivity and final pressure value)

OFF=(C2+(C4-1024)*dUT/2^14)*4

SENS = C1+ C3*dUT/2^10

X= SENS * (D1-7168)/2^14 - OFF

P=X*10/2^5+C7

• For altitude measurement system, recommend to use P=X*100/2^5+C7*10

• So that better altitude resolution can be achieved

Step 3: (calculate temperature)

T = 250 + dUT * C6 / 2 ^ 16-dUT/2^D

Example:

C1=29908

C2=3724

C3=312

C4=441

C5=9191

C6=3990

C7=2500

A=1

B=4

C=4

D=9

D1=30036

D2=4107

dUT = (4107-9191) - ((4107-9191)*(4107-9191)/128^2) * 4 / 2^4 = -5478

OFF = (3724 + (441-1024) * (-5478) / 2^14) * 4 =15675

SENS= 29908 + 312 * (-5478) / 2^10 = 28238

X= 28238 * (30036-7168) / 2^14 – 15675 = 23738

P= 23738 * 10 /2^5 + 2500 = 9918 = 991.8hpa

T= 250 + (-5478) * 3990 /2^16- (-5478/2^9) =-72 = -7.2

°C