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MS5837-02BA
Ultra Small Gel Filled Pressure & Temperature Sensor, with Stainless Steel Cap
TE CONNECTIVITY SENSORS /// MS5837-02BA 09/2017
Page 7
PRESSURE AND TEMPERATURE CALCULATION
Flow chart for pressure and temperature reading and software compensation
Size
[1]
[bit]
min
C1
Pressure sensitivity | SENS
T1
unsigned int 16
16
0
65535
46372
C2
Pressure offset | OFF
T1
unsigned int 16
16
0
65535
43981
C3
Temperature coefficient of pressure sensitivity | TCS
unsigned int 16
16
0
65535
29059
C4
Temperature coefficient of pressure offset | TCO
unsigned int 16
16
0
65535
27842
C5
Reference temperature | T
REF
unsigned int 16
16
0
65535
31553
C6
Temperature coefficient of the temperature | TEMPSENS
unsigned int 16
16
0
65535
28165
D1
Digital pressure value
unsigned int 32
24
0
16777216
6465444
D2
Digital temperature value
unsigned int 32
24
0
16777216
8077636
dT
Difference between actual and reference temperature
[2]
dT
= D2 - T
REF
=
D2
-
C5 * 2
8
signed int 32
25
-16776960
16777216
68
2000
= 20.00 °C
OFF
Offset at actual temperature
[3]
OFF
=
OFF
T1
+
TCO
*
dT =
C2
*
2
17
+
(C4
*
dT
)
/
2
6
signed int 64
41
-17179344900
25769410560
5764707214
SENS
Sensitivity at actual temperature
[4]
SENS
=
SENS
T1
+
TCS
*
dT
=
C1 * 2
16
+
(
C3
*
dT
)
/
2
7
signed int 64
41
-8589672450
12884705280
3039050829
110002
= 1100.02 mbar
Notes
[1]
[2]
[3]
[4]
min and max have to be defined
min and max have to be defined
Maximal size of intermediate result during evaluation of variable
120000
1000
58
P
Recommended
variable type
Description | Equation
signed int 32
Actual temperature (-40…85°C with 0.01°C resolution)
TEMP
=
20°C
+
dT
*
TEMPSENS
=
2000
+
dT
*
C6
/
2
23
Read digital pressure and temperature data
signed int 32
Temperature compensated pressure (10…1200mbar with
0.01mbar resolution)
P
= D1 * SENS - OFF =
(D1 * SENS / 2
21
- OFF) / 2
15
min and max have to be defined
Convert calibration data into coefficients (see bit pattern of W1 to W4)
Variable
Example /
Typical
Value
Calculate temperature compensated pressure
8500
-4000
TEMP
41
Start
Maximum values for calculation results:
P
MIN
= 10mbar P
MAX
= 2000mbar
T
MIN
= -40°C T
MAX
= 85°C T
REF
= 20°C
Read calibration data (factory calibrated) from PROM
Read digital pressure and temperature data
Calculate temperature
Calculate temperature compensated pressure
Pressure and temperature value first order
max