MS5535-CM Measurement Specialties Inc., MS5535-CM Datasheet - Page 11

• Manufacturer Part Number: MS5535-CM
• Description: SENSOR PRESURE 14 BAR 16BIT
• Manufacturer: Measurement Specialties Inc.

Specifications of MS5535-CM

• Pressure Type: Absolute
• Operating Pressure: 203.05 PSI, 14bar
• Output: Digital
• Voltage - Supply: 2.2 V ~ 3.6 V
• Termination Style: PCB
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 9 x 9mm Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 223-1101-2

NOTES
1) Readings of D2 can be done less frequently, but the display will be less stable in this case.
2) For a stable display of 0.1 mbar resolution, it is recommended to display the average of 8 subsequent
DA5535C_003.doc
000055351195 ECN1118
pressure values.
Read calibration data (factory calibrated) from
C1: Pressure sensitivity
C2: Pressure offset
C3: Temperature coefficient of pressure sensitivity (10 Bit)
C4: Temperature coefficient of pressure offset
C5: Reference temperature
C6: Temperature coefficient of the temperature
Read digital temperature value from MS5535B
Calculate temperature compensated pressure
Offset at actual temperature:
Sensitivity at actual temperature:
Temperature compensated pressure:
Difference between actual temperature and reference
temperature:
Actual temperature:
Read digital pressure value from MS5535B
Convert calibration data into coefficients:
Word1, Word2, Word3 and Word4 (4x16 Bit)
Display pressure and temperature value
OFF = C2 + (C4 - 250)*dT/2
SENS = C1/2 + (C3 + 200) )*dT/2
P = SENS * (D1 - OFF))/2
dT = D2 - UT1
TEMP = 200 + dT*(C6+100)/2
(see bit pattern of Word1-Word4)
Calculate calibration temperature
Fig. 3: Flow chart for pressure and temperature reading and software compensation.
Calculate actual temperature
PROM of MS5535B
UT1 = 8*C5 + 10000
D1 (16 Bit)
D2 (16 Bit)
Start
12
12
+ 1000
+ 10000
11
(0.1° C resolution)
13
+ 3000
(13 Bit)
(13 Bit)
(12 Bit)
(9 Bit)
(7 Bit)
June 16th, 2008
dT(D2) = D2 - T
TEMP(D2) = 20 + dT(D2) * TEMPSENS
OFF(D2) = OFFT1 + TCO*dT(D2)
SENS(D2) = SENST1 + TCS * dT(D2)
P(D1,D2) = SENS(D2) * (D1 – OFF(D2))
SENST1
OFFT1
TCS
TCO
T
TEMPSENS
ref
Basic equations:
ref
dT
TEMP = 243
OFF
SENS = 4198
P
Word1 = 18556
Word2 = 49183
Word3 = 22354
Word4 = 28083
C1 = 2319
C2 = 4864
C3 = 349
C4 = 219
C5 = 2002
C6 =
D1 = 17788
D2 = 26603
Example:
= 587
= 24.3° C
= 14859
= 4001
= 4001mbar
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