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PDF MS5541-30C Data sheet ( Hoja de datos )
| Número de pieza | MS5541-30C | |
| Descripción | MINIATURE 30 bar MODULE | |
| Fabricantes | Intersema | |
| Logotipo |  |
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MS5541-30C (RoHS*) MINIATURE 30 bar MODULE
DESCRIPTION
• 0 – 30 bar absolute pressure range
• 6 coefficients for a software compensation stored
on-chip
• Piezoresistive silicon micromachined sensor
• Integrated pressure sensor 6.2x6.4 mm
• 16 Bit ADC
• 3-wire serial interface
• 1 system clock line (32.768 kHz)
• Low voltage and low power consumption
• RoHS-compatible & Pb-free*
The MS5541-30C is the high-pressure version of MS5541C pressure sensor module. It contains a precision
piezoresistive pressure sensor and an improved version of the 16 Bit Micropower Sensor interface IC known
from the MS5535C. The ESD sensitivity has been improved to 4kV on all pins. In addition to this the MS5541-
30C is from its outer dimensions compatible to the MS54xx series of pressure sensors. It uses an antimagnetic
polished stainless steel ring for sealing with O-ring. The sensor provides 16 Bit pressure and temperature data
via a 3 wire serial interface that can be easily interfaced with 4 Bit low power microcontrollers. 64 Bit of factory
programmed PROM provides calibration data for a highly accurate pressure and temperature calculation.
FEATURES
APPLICATIONS
• Resolution 3.0 mbar
• Supply voltage 2.2 V to 3.6 V
• Operating current < 5uA
• Standby current < 0.1uA
• -40°C to +85°C
• No external components required
BLOCK DIAGRAM
• Diving computers and divers watches
• Mobile water depth measurement systems
SENSOR +IN
-IN
SGND
Input MUX
ADC dig.
Filter
Sensor
Interface IC
Digital
Interface
Memory
(PROM)
64 bits
Fig.: 1 Block Diagram MS5541-30C
VDD
MCLK
DIN
DOUT
SCLK
GND
* The European RoHS directive 2002/95/EC (Restriction of the use of certain Hazardous Substances in electrical and electronic
equipment) bans the use of lead, mercury, cadmium, hexavalent chromium and polybrominated biphenyls (PBB) or polybrominated
diphenyl ethers (PBDE).
DA5541-30C_001.doc
0005541C1348 ECN1143
Sept. 25th, 2008
1
1 page  
PRESSURE OUTPUT CHARACTERISTICS
With the calibration data stored in the interface IC of the MS5541-30C the following characteristics can be
achieved:
(VDD = 3.0 V unless noted otherwise)
Parameter
Conditions
Min Typ Max Unit Note
Resolution
Absolute Pressure Accuracy
(Temperature range 0 .. +40 °C)
Absolute Pressure Accuracy
(Temperature range -40 .. +85 °C)
Error over Temperature
(p = const. relative to 20°C)
Long-term Stability
Maximum Error over Supply
Voltage
p = 0 .. 10bar
p = 0 .. 20bar
p = 0 .. 30bar
p = 0 .. 10bar
p = 0 .. 20bar
p = 0 .. 30bar
Ta = -40…+85°C
6 months
VDD = 2.2…3.6V
3.0 mbar
-50
-100
-250
-100
-150
-400
+50
+50
+50
+250
+450
+500
mbar
mbar
mbar
mbar
mbar
mbar
-25 +250 mbar
50 mbar
-40 +40 mbar
1
2
3
4
NOTES
1) A stable pressure reading of the given resolution requires taking the average of 2 to 4 subsequent pressure
values due to noise of the ADC.
2) Maximum error of pressure reading over the pressure range.
3) With the second-order temperature compensation as described in Section “FUNCTION". See next section
for typical operating curves.
4) The long-term stability is measured with non-soldered devices
TEMPERATURE OUTPUT CHARACTERISTICS
This temperature information is not required for most applications, but it is necessary to allow for temperature
compensation of the pressure output. The reference temperature is 20°C.
Parameter
Resolution
Accuracy
Maximum Error over Supply
Voltage
Conditions
Ta = 20°C
Ta = -40…+85°C
VDD = 2.2…3.6V
Min Typ Max
0.005
0.015
-0.8 0.8
-2 +6
-0.2 0.2
Unit
°C
°C
°C
°C
Note
1
NOTE
1) With the second-order temperature compensation as described in Section “FUNCTION". See next section
for typical operating curves.
DA5541-30C_001.doc
0005541C1348 ECN1143
Sept. 25th, 2008
5
5 Page 
Start
Read calibration data (factory calibrated) from
PROM of MS5541-30
Word1, Word2, Word3 and Word4 (4x16 Bit)
Basic equations:
Convert calibration data into coefficients:
(see bit pattern of Word1-Word4)
C1: Pressure sensitivity
C2: Pressure offset
C3: Temperature coefficient of pressure sensitivity
C4: Temperature coefficient of pressure offset
C5: Reference Temperature
C6: Temperature coefficient of the temperature
(13 Bit)
(13 Bit)
(10 Bit)
(9 Bit)
(12 Bit)
(7 Bit)
SENST1
OFFT1
TCS
TCO
Tref
TEMPSENS
Example:
Word1 = 46076
Word2 = 14170
Word3 = 39937
Word4 = 33721
C1 =
C2 =
C3 =
C4 =
C5 =
C6 =
5759
4317
624
263
1665
57
Read digital pressure value from MS5541-30
D1 (16 Bit)
Read digital temperature value from MS5541-30
D2 (16 Bit)
Calculate calibration temperature
UT1=8*C5+10000
Calculate actual temperature
Difference between actual temperature and reference
temperature:
dT = D2 - UT1
Actual temperature:
TEMP = 200 + dT*(C6+100)/211 (0.1°C)
dT(D2) = D2 - Tref
TEMP(D2)=20°+dT(D2)*TEMPSENS
Calculate temperature compensated pressure
Offset at actual temperature:
OFF = C2 + ((C4-250)*dT)/212 + 10000
Sensitivity at actual temperature:
SENS = C1/2 + ((C3+200)*dT)/213 + 3000
OFF(D2)=OFFT1+TCO*dT(D2)
SENS(D2)=SENST1+TCS*dT(D2)
Temperature compensated pressure in mbar:
P = (SENS * (D1-OFF))/211 + 1000
P(D1,D2)=D1*SENS(D2)-OFF(D2)
D1 = 15380
D2 = 22027
UT1 = 23320
dT = -1293
TEMP = 101
= 10.1 °C
OFF = 14312
SENS = 5749
P = 3998
= 3998 mbar
Display pressure and temperature value
Fig. 3: Flow chart for pressure/temperature reading and software compensation.
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
pressure values.
DA5541-30C_001.doc
0005541C1348 ECN1143
Sept. 25th, 2008
11
11 Page | ||
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| PDF Descargar | [ Datasheet MS5541-30C.PDF ] | |
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