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PDF MS5535C Data sheet ( Hoja de datos )
| Número de pieza | MS5535C | |
| Descripción | PRESSURE SENSOR MODULE | |
| Fabricantes | Intersema | |
| Logotipo |  |
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MS5535C (RoHS*) PRESSURE SENSOR MODULE
• 0 - 14 bar absolute pressure range
• 6 coefficients for software compensation stored
on-chip
• Piezoresistive silicon micromachined sensor
• Integrated miniature pressure sensor 9 x 9 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*
DESCRIPTION
The MS5535C is a SMD-hybrid device including a piezoresistive pressure sensor and an ADC-Interface IC. It
provides a 16 Bit data word from a pressure and temperature dependent voltage. Additionally the module
contains 6 readable coefficients for a highly accurate software calibration of the sensor. MS5535C is a low
power, low voltage device with automatic power down (ON/OFF) switching. A 3-wire interface is used for all
communications with a microcontroller.
The MS5535C is fully software compatible to the previous versions (MS5535A and MS5535B). Compared to the
previous versions the ESD sensitivity has been improved to 4kV on all pins.
FEATURES
• Supply voltage 2.2 V to 3.6 V
• Low supply current
• -40°C to +125°C operation temperature
• No external components required
• 16 Bit ADC resolution pressure measurement
and control systems
APPLICATIONS
• Mobile water depth measurement systems
• Diving computers and divers watches
BLOCK DIAGRAM
SENSOR +IN
-IN
SGND
Input MUX
ADC
dig.
Filter
Sensor
Interface IC
Digital
Interface
Memory
(PROM)
64 bits
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).
DA5535C_003.doc
000055351195 ECN1118
June 16th, 2008
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1 page  
PRESSURE OUTPUT CHARACTERISTICS
With the calibration data stored in the interface IC of the MS5535C the following characteristics can be achieved:
Parameter
Resolution
Absolute Pressure Accuracy
(Temperature range 0 .. +40°C)
Absolute Pressure Accuracy
(Temperature range -40 .. +85°C)
Absolute Pressure Accuracy
(Temperature range -40 .. +125°C)
Long-term Stability
Maximum Error over Supply
Voltage
Conditions
p = 0 .. 5 bar
p = 0 .. 10 bar
p = 0 .. 14 bar
p = 0 .. 5 bar
p = 0 .. 10 bar
p = 0 .. 14 bar
p = 0 .. 5 bar
p = 0 .. 10 bar
p = 0 .. 14 bar
6 months
VDD = 2.2 .. 3.6 V
Min
-25
-60
-150
-40
-60
-160
-80
-100
-300
-16
(VDD = 3.0 V unless noted otherwise)
Typ Max
Unit Notes
1.2 mbar
+20
+20
+20
+100
+180
+200
+200
+200
+200
mbar
mbar
mbar
20 mbar
1
2
2
2
3
+16 mbar
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) 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.
(VDD = 3.0 V unless noted otherwise)
Parameter
Conditions
Min Typ Max Unit Notes
Resolution
0.005 0.01 0.015
°C
Accuracy
Maximum Error over Supply
Voltage
T = 20°C
T = -40 .. +125°C
VDD = 2.2 .. 3.6 V
-0.8
-4
-0.2
0.8 °C
+6 °C
0.2 °C
1
NOTE
1) With the second-order temperature compensation as described in Section “FUNCTION". See next section
for typical operating curves.
DA5535C_003.doc
000055351195 ECN1118
June 16th, 2008
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Start
Read calibration data (factory calibrated) from
PROM of MS5535B
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 = 18556
Word2 = 49183
Word3 = 22354
Word4 = 28083
C1 = 2319
C2 = 4864
C3 = 349
C4 = 219
C5 = 2002
C6 = 51
Read digital pressure value from MS5535B
D1 (16 Bit)
Read digital temperature value from MS5535B
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 resolution)
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
Temperature compensated pressure:
P = SENS * (D1 - OFF))/212 + 1000
OFF(D2) = OFFT1 + TCO*dT(D2)
SENS(D2) = SENST1 + TCS * dT(D2)
P(D1,D2) = SENS(D2) * (D1 – OFF(D2))
D1 = 17788
D2 = 26603
dT = 587
TEMP = 243
= 24.3°C
OFF = 14859
SENS = 4198
P = 4001
= 4001mbar
Display pressure and temperature value
Fig. 3: Flow chart for pressure and 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 0.1 mbar resolution, it is recommended to display the average of 8 subsequent
pressure values.
DA5535C_003.doc
000055351195 ECN1118
June 16th, 2008
11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet MS5535C.PDF ] | |
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