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Miniature altimeter boasts 10-2000mBar pressure range

Posted: 13 Nov 2013     Print Version  Bookmark and Share

Keywords:Measurement Specialties  altimeter  sensor module  variometer  barometer 

Measurement Specialties has announced a low-power, compact digital barometric pressure sensor module that operates from 10-2000mBar. The MS5806 has an altitude resolution of up to 20cm that makes it ideal for altimeters and variometers, stated the company. Measuring only 6.4 x 4 x 2.75mm, the device easily fits in space-constrained devices such as high-end thin watches, adventure and multi-mode watches, fitness gadgets, mobile altimeter/barometer systems and bike computers, added the firm.

The 24bit Delta Sigma ADC integrated digital pressure sensor features several different operation modes to optimise conversion speed and current consumption. The sensor converts the device's uncompensated analogue output voltage from the Piezo-resistive pressure sensor to a 24bit value, while providing a 24bit value for the temperature of the sensor as well.

The hermetically-sealed MS5806 features a protective cap constructed of an anticorrosive, polished stainless steel and is filled with a silicone gel protecting the sensor and bonding wires. An optional O-ring placed on the cap's outer diameter provides water-resistance to 100m, while avoiding mechanical stresses on the sensor.

The MS5806 uses six coefficients to compensate for process variations for increased measurement accuracy as well as I2C or SPI communication to offer a conversion time down to 0.6ms. It can be interfaced to virtually any MCU.

The digital barometric pressure sensor module features a low power of 0.9mA (standby <0.15mA at 25°C), supply voltage range of 1.8-3.6V, pressure range from 300-1100mBar (Extended: 10-2000mBar) and operating temperature range of -40°C to 85°C. Additionally, the device offers ±2.5mBar typical pressure accuracy (with auto zero at one pressure point), temperature accuracy of ±0.8°C at 25°C and temperature resolution less than 0.01°C.

Pricing for a MS5806 is $11.80 per unit in quantities of 10,000. Delivery time is dependent upon quantity ordered.

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