The Optum MS5540-CM barometer is a hybrid surface-mount sensor with a piezoresistive pressure sensing element and an integrated 16-bit ADC. It measures absolute pressure and provides a 16-bit digital output, with compensation using 6 parameters stored in its memory. It is used in portable altimeters and barometers, weather control systems, and adventure functions in watches.
The SPI interface and 3-wire serial interface enable communication with a microprocessor. The sensor is waterproof for use at depths of up to 100 m and is RoHS-compliant and lead-free.
- Sensor type: Absolute pressure sensor
- Pressure range: 10–1100 mbar
- Resolution: 0.1 mbar
- Converter: 16-bit ADC
- Interface: SPI
- Serial interface: 3-wire
- Memory: 6 parameters for software compensation
- Operating voltage: 2.2–3.6 V
- Operating current: < 5 μA
- Operating temperature: -40 to +85 °C
- Maximum water depth: 100 m
- Sensor dimensions: 6.2 × 6.4 mm
- Board dimensions: 18 × 16 mm
- System clock frequency: 32.768 kHz
- Compliance: RoHS, lead-free