diving computer pressure sensor 3-wire serial interface

diving computer pressure sensor 3-wire serial interface
 

MS5540-CM Absolute Pressure Sensor Module 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 microcontroller. 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.

MS5540C pressure sensor FEATURES                                                       
• Resolution 0.1 mbar                                       
• Supply voltage 2.2 V to 3.6 V                          
• Low supply current < 5 µA                              
• Standby current < 0.1 µA                                
• -40°C to +85°C operation temperature
• No external components required

MS5540C pressure sensor APPLICATIONS
• Mobile altimeter / barometer systems
• Weather control systems
• Adventure or multi-mode watches
• GPS receivers
 

MS5540C pressure sensor Specification

• 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
• 16 Bit ADC
• 3-wire serial interface
• 1 system clock line (32.768 kHz)
• Low voltage and low power consumption

MS5540-CM Absolute Pressure Sensor Module Pin Cinfuguration: