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PDF MS5540B Data sheet ( Hoja de datos )
| Número de pieza | MS5540B | |
| Descripción | MINIATURE BAROMETER MODULE | |
| Fabricantes | Intersema | |
| Logotipo |  |
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MS5540B (RoHS*) MINIATURE BAROMETER MODULE
• 10 - 1100 mbar absolute pressure range
• 6 coefficients for software compensation stored
on-chip
• Piezoresistive silicon micromachined sensor
• Integrated miniature pressure sensor 6.2 x 6.4 mm
• 15 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 MS5540B is a SMD-hybrid device including a precision piezoresistive pressure sensor and an ADC-
Interface IC. It is a miniature version of the MS5534B barometer/altimeter module and provides a 16 Bit data
word from a pressure and temperature dependent voltage. MS5540B 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 micro-
controller.
Compared to MS5534A the pressure range (measurement down to 10 mbar) has been improved. Other
improvements concern the ESD sensitivity, current consumption and converter accuracy. The MS5540B is fully
software compatible to the MS5534A and MS5534B. In addition, the MS5540B is from its outer dimensions
compatible to the MS54XX series of pressure sensors. The gel protection of the sensor provides a water
protection sufficient for 100 m waterproof watches without any additional protection.
FEATURES
APPLICATIONS
• Resolution 0.1 mbar
• Supply voltage 2.2 V to 3.6 V
• Low supply current < 5 uA
• Standby current < 0.1 uA
• -40°C to +85°C operation temperature
• No external components required
• Mobile altimeter/barometer systems
• Weather control systems
• Adventure or multi-mode watches
• GPS receivers
BLOCK DIAGRAM
SENSOR +IN
-IN
SGND
Input MUX
ADC
dig.
Filter
Sensor
Interface IC
Digital
Interface
Memory
(PROM)
64 bits
Fig. 1: Block diagram 5540B.
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).
DA5540B_007
00005540767 ECN 865
September 25th, 2006
1
1 page  
PRESSURE OUTPUT CHARACTERISTICS
With the calibration data stored in the interface IC of the MS5540B the following characteristics can be achieved:
Parameter
Resolution
Absolute Pressure Accuracy
Relative Pressure Accuracy
Error over Temperature
Long-term Stability
Maximum Error over Supply
Voltage
Conditions
p = 750 .. 1100 mbar
Ta = 25°C
p = 750 .. 1100 mbar
Ta = 25°C
T = 0 .. +50°C
p = 300 .. 1000 mbar
T = -40 .. +85°C
p = 300 .. 1000 mbar
12 months
VDD = 2.2 .. 3.6 V
p = const.
(VDD = 3.0 V unless noted otherwise)
Min Typ Max
Unit Notes
0.1
mbar
1
-1.5
+1.5 mbar
2
-0.5
+0.5 mbar
3
-1
+1 mbar
4
-1 +3 mbar
-1 mbar
-1.6 +1.6 mbar
4
5
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) Maximum error of pressure reading over the pressure range after offset adjustment at one pressure point.
4) With the second-order temperature compensation as described in Section “FUNCTION". See next section
for typical operating curves.
5) 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
0.015
°C
Accuracy
Maximum Error over Supply
Voltage
T = 20°C
T = -40 .. +85°C
VDD = 2.2 .. 3.6 V
-0.8
±2
0.8
-0.2 + 0.2
°C
°C
°C
1
NOTES
1) With the second-order temperature compensation as described in Section “FUNCTION". See next section
for typical operating curves.
DA5540B_007
00005540767 ECN 865
September 25th, 2006
5
5 Page 
C1 (15 Bit)
C5/I
1 Bit
Word1 DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 DB10
Word2
C5/II (10 Bit)
C6 (6 Bit)
DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 DB5 DB4 DB3 DB2 DB1 DB0
Word3
C4 (10 Bit)
C2/I (6 Bit)
DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 DB11 DB10 DB9 DB8 DB7 DB6
Word4
C3 (10 Bit)
C2/II (6-Bit)
DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 DB5 DB4 DB3 DB2 DB1 DB0
Fig. 4: Arrangement (Bit-pattern) of calibration data in Word1 to 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:
TEMP < 200
yes
Low Temperatures
T2 = 11*(C6+24)*(200 - TEMP)*(200 – TEMP) / 220
P2 = 3 *T2 * (P - 3500)/214
200 ≤ TEMP ≤ 450
TEMP > 450
yes
No correction
T2 = 0
P2 = 0
yes
High Temperatures
T2 = 3*(C6+24)*(450 - TEMP)*(450 – TEMP) / 220
P2 = T2 * (P - 10000)/213
Calculate pressure and temperature
TEMP = TEMP – T2
P = P – P2
Fig. 5: Flow chart for calculating the temperature and pressure to the optimum accuracy.
DA5540B_007
00005540767 ECN 865
September 25th, 2006
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet MS5540B.PDF ] | |
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