MS5541-CM Measurement Specialties Inc., MS5541-CM Datasheet - Page 11

• Manufacturer Part Number: MS5541-CM
• Description: MODULE 14 BAR PRESSURE MINI SNSR
• Manufacturer: Measurement Specialties Inc.

Specifications of MS5541-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 ~ 85°C
• Package / Case: 6.2 x 6.4mm Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 223-1099-2

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 1 mbar resolution, it is recommended to display the average of 4 to 8 subsequent
DA5541C_001.doc
000055411194 ECN1037
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
Calculate temperature compensated pressure
Offset at actual temperature:
Sensitivity at actual temperature:
Temperature compensated pressure in mbar:
Read digital temperature value from MS5541
Difference between actual temperature and reference
temperature:
Actual temperature:
Convert calibration data into coefficients:
Read digital pressure value from MS5541
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/temperature reading and software compensation.
Calculate actual temperature
PROM of MS5541
UT1=8*C5+10000
D1 (16 Bit)
D2 (16 Bit)
Start
12
+ 1000
12
11
+ 10000
13
(0.1° C)
+ 3000
(13 Bit)
(13 Bit)
(12 Bit)
February 19th, 2008
(9 Bit)
(7 Bit)
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)=D1*SENS(D2)-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 =
C4 =
C5 = 2002
C6 =
D1 = 17788
D2 = 26603
UT1 = 26016
Example:
= 587
= 24.3 ° C
= 14859
= 4001
= 4001 mbar
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