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Intersema introduces two new miniature pressure sensor modules. The new modules MS5540 and MS5541 are smaller versions of the popular MS5534 and MS5535.

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

• 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

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The MS5541B is the miniature version of the popular MS5535B pressure sensor module. It contains a precision piezoresistive pressure sensor and an improved version of the 15 Bit Micropower Sensor interface IC known from the MS5535B. Compared to the MS5535A the temperature range has been improved (-40 to +85°C). Other improvements concern the ESD sensitivity, current consumption and converter accuracy. In addition to this the MS5541B 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 15 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. The MS5541B is fully software compatible to the MS5535B and MS5535A.

FEATURES

• Integrated pressure sensor 6.2x6.4 mm
• Pressure range 0 - 14 bar (200 PSI)
• 15 Bit ADC
• 6 coefficients for a software compensation stored on-chip
• 3-wire serial interface
• 1 system clock line (32.768 kHz)
• Low voltage / low power
• RoHS-compatible & Pb-free