MS5540C (RoHS
*
)
MINIATURE BAROMETER MODULE
•
10 - 1100 mbar absolute pressure range
•
6 coefficients for software compensation stored
on-chip
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Piezoresistive silicon micromachined sensor
•
Integrated miniature pressure sensor 6.2 x 6.4 mm
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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 MS5540C is a SMD-hybrid device including a precision piezoresistive pressure sensor and an ADC-
Interface IC. It is a miniature version of the MS5534C barometer/altimeter module and provides a 16 Bit data
word from a pressure and temperature dependent voltage. MS5540C 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. The MS5540C
is fully software compatible to the MS5534C and previous versions of MS5540. In addition, the MS5540C is from
its outer dimensions compatible to the MS54XX series of pressure sensors. Compared to the previous version
the ESD sensitivity level has been improved to 4kV on all pins. The gel protection of the sensor provides a water
protection sufficient for 100 m waterproof watches without any additional protection.
FEATURES
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•
•
•
•
•
Resolution 0.1 mbar
Supply voltage 2.2 V to 3.6 V
Low supply current < 5 µA
Standby current < 0.1 µA
-40° to +85° operation temperature
C
C
No external components required
APPLICATIONS
•
•
•
•
Mobile altimeter/barometer systems
Weather control systems
Adventure or multi-mode watches
GPS receivers
BLOCK DIAGRAM
VDD
MCLK
Input MUX
SENSOR
+IN
dig.
Filter
Digital
Interface
ADC
DIN
DOUT
SCLK
-IN
Sensor
Interface IC
SGND
Memory
(PROM)
64 bits
GND
Fig. 1: Block diagram MS5540C.
*
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).
DA5540C_003
0005540C1193 ECN 1118
June 16th, 2008
1
INTERSEMA [ INTERSEMA SENSORIC SA ]
