MS5540-CM Measurement Specialties Inc., MS5540-CM Datasheet - Page 11

• Manufacturer Part Number: MS5540-CM
• Description: MODULE BAROMETER MINITURE SENSOR
• Manufacturer: Measurement Specialties Inc.

Specifications of MS5540-CM

• Pressure Type: Absolute
• Operating Pressure: 0.15 ~ 0.16 PSI, 10 ~ 1100 mbar
• 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: 223-1098-2

Word1
Word2
Word3
Word4
SECOND-ORDER TEMPERATURE COMPENSATION
In order to obtain best accuracy over the whole temperature range, it is recommended to compensate for the
non-linearity of the output of the temperature sensor. This can be achieved by correcting the calculated
temperature and pressure by a second order correction factor. The second-order factors are calculated as
follows:
DA5540C_001
0005540C1193 ECN 1037
T2 = 11*(C6+24)*(200 - TEMP)*(200 – TEMP) / 2
P2 = 3 *T2 * (P - 3500)/2
DB14
DB9
DB9
DB9
Fig. 5: Flow chart for calculating the temperature and pressure to the optimum accuracy.
DB13
Low Temperatures
DB8
DB8
DB8
TEMP < 200
Fig. 4: Arrangement (Bit-pattern) of calibration data in Word1 to Word4.
DB12
DB7
DB7
DB7
14
yes
DB11
DB6
DB6
DB6
C5/II (10 Bit)
DB10
C4 (10 Bit)
C3 (10 Bit)
DB5
DB5
DB5
Calculate pressure and temperature
DB9
DB4
DB4
DB4
20
TEMP = TEMP – T2
P = P – P2
February 20th, 2008
DB8
DB3
DB3
DB3
C1 (15 Bit)
200 ≤ TEMP ≤ 450
T2 = 0
P2 = 0
No correction
DB7
DB2
DB2
DB2
DB6
DB1
DB1
DB1
yes
DB5
DB0
DB0
DB0
DB11
DB4
DB5
DB5
T2 = 3*(C6+24)*(450 - TEMP)*(450 – TEMP) / 2
P2 = T2 * (P - 10000)/2
DB10
DB3
DB4
DB4
High Temperatures
C2/II (6-Bit)
DB2
DB3
C2/I (6 Bit)
DB9
DB3
C6 (6 Bit)
TEMP > 450
13
DB1
DB2
DB8
DB2
yes
DB0
DB1
DB7
DB1
C5/I
1 Bit
DB10
DB0
DB6
DB0
20
11