I2C Precision Altimeter

The MPL3115A2 employs a MEMS pressure sensor with an I2C interface to provide accurate Pressure/Altitude and Temperature data. The sensor outputs are digitized by a high resolution 24-bit ADC. Internal processing removes compensation tasks from the host MCU system. Multiple user-programmable, power saving, interrupt and autonomous data acquisition modes are available, including programmed acquisition cycle timing, and poll-only modes. Typical active supply current is 40 A per measurement-second for a stable 30 cm output resolution. Pressure output can be resolved with output in fractions of a Pascal, and Altitude can be resolved in fractions of a meter.
The MPL3115A2 is offered in a 5 mm by 3 mm by 1.1 mm LGA package and specified for operation from -40°C to 85°C. Package is surface mount with a stainless steel lid and is RoHS compliant.

FEATUREs
• 1.95V to 3.6V Supply Voltage, internally regulated by LDO
• 1.6V to 3.6V Digital Interface Supply Voltage
• Fully Compensated internally
• Direct Reading, Compensated
   – Pressure: 20-bit measurement (Pascals)
   – Altitude: 20-bit measurement (meters)
   – Temperature: 12-bit measurement (degrees Celsius)
• Programmable Events
• Autonomous Data Acquisition
• Resolution down to 1 ft. / 30 cm
• 32 Sample FIFO
• Ability to log data up to 12 days using the FIFO
• 1 second to 9 hour data acquisition rate
• I2C digital output interface (operates up to 400 kHz)

APPLICATION Examples
• High Accuracy Altimetry
• Smartphones/Tablets
• Personal Electronics Altimetry
• GPS Dead Reckoning
• GPS Enhancement for Emergency Services
• Map Assist, Navigation
• Weather Station Equipment