MS5803-14BA Datasheet, PDF (9/19 Pages) TE Connectivity Ltd – High resolution module, 0.2 mbar

MS5803-14BA
Miniature 14 bar Module
PRESSURE AND TEMPERATURE CALCULATION
Start
Maximum values for calculation results:
P_MIN = 0mbar P _MAX = 14bar
T_MIN = -40°C T _MAX = 85°C T _REF = 20°C
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Variable Description | Equation
C1
Pressure sensitivity | SENS _T1
C2
Pressure offset | OFF _T1
C3
Temperature coefficient of pressure sensitivity | TCS
C4
Temperature coefficient of pressure offset | TCO
C5
Reference temperature | T _REF
C6
Temperature coefficient of the temperature | TEMPSENS
Recommended
variable type
unsigned int 16
unsigned int 16
unsigned int 16
unsigned int 16
unsigned int 16
unsigned int 16
Size ^[1]
[bit]
16
16
16
16
16
16
Value
min
max
0
65535
0
65535
0
65535
0
65535
0
65535
0
65535
Example /
Typical
46546
42845
29751
29457
32745
29059
D1
Digital pressure value
D2
Digital temperature value
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unsigned int 32
24
0
unsigned int 32
24
0
16777216
16777216
4311550
8387300
dT
TEMP
Calculate temperature
Difference between actual and reference temperature ^[2]
dT = D2 - T _REF = D2 - C5 * 2 ⁸
Actual temperature (-40…85°C with 0.01°C resolution)
TEMP = 20°C + dT * TEMPSENS = 2000 + dT * C6 / 2²³
signed int 32
25
signed int 32
41
-16776960
-4000
16777216
8500
4580
2015
= 20.15 °C
OFF
SENS
P
CalCcaulcautelatteemtepmerpaeturaretucreomcopmenpseantseadtepdrepsrseusrseure
Offset at actual temperature ^[3]
OFF = OFF_T1 + TCO * dT = C2 * 2¹⁶ + (C4 * dT ) / 2⁷
Sensitivity at actual temperature ^[4]
SENS = SENS _T1 + TCS * dT = C1 * 2 ¹⁵ + (C3 * dT ) / 2⁸
Temperature compensated pressure (0…14bar with
0.1mbar resolution)
P = D1 * SENS - OFF = (D1 * SENS / 2 ²¹ - OFF) / 2 ¹⁵
signed int 64
signed int 64
41
-8589672450
41
-4294836225
signed int 32
58
0
12884705280
6442352640
140000
2808943928
1525751591
10005
= 1000.5 mbar
Notes
[1]
[2]
[3]
[4]
Display pressure and temperature value
Maximal size of intermediate result during evaluation of variable
min and max have to be defined
min and max have to be defined
min and max have to be defined
Figure 3: Flow chart for pressure and temperature reading and software compensation.
SENSOR SOLUTIONS ///MS5803-14BA
09/2015
Page 9