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
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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
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Mobile altimeter/barometer systems
Weather control systems
Adventure or multi-mode watches
GPS receivers
BLOCK DIAGRAM
VDD
MCLK
Input MUX
+IN
-IN
Digital
Interface
SENSOR
DIN
DOUT
SCLK
dig.
Filter
ADC
Memory
(PROM)
64 bits
Sensor
Interface IC
SGND
GND
Fig. 1: Block diagram 5540B.
* 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
September 25th, 2006
1
00005540767 ECN 865
INTERSEMA [ INTERSEMA SENSORIC SA ]
