General description
The MPL3115A2 is a compact, piezoresistive, absolute pressure sensor with an I2C
digital interface. MPL3115A2 has a wide operating range of 20 kPa to 110 kPa, a range
that covers all surface elevations on earth. The MEMS is temperature compensated
utilizing an on-chip temperature sensor. The pressure and temperature data is fed into
a high resolution ADC to provide fully compensated and digitized outputs for pressure
in Pascals and temperature in °C. The compensated pressure output can then be
converted to altitude, utilizing the formula stated in Section 9.1.3 "Pressure/altitude"
provided in meters.The internal processing in MPL3115A2 removes compensation and
unit conversion load from the system MCU, simplifying system design.
MPL3115A2's advanced ASIC has multiple user programmable modes such as power
saving, interrupt and autonomous data acquisition modes, including programmed
acquisition cycle timing, and poll-only modes. Typical active supply current is 40 μA per
measurement-second for a stable 10 cm output resolution.
Features and benefits
Operating range: 20 kPa to 110 kPa absolute pressure
Calibrated range: 50 kPa to 110 kPa absolute pressure
Calibrated temperature output: −40 °C to 85 °C
I2C digital output interface
Fully compensated internally
Precision ADC resulting in 0.1 meter of effective resolution
Direct reading
Pressure: 20-bit measurement (Pascals)
– 20 to 110 kPa
Altitude: 20-bit measurement (meters)
– –698 to 11,775 m
Temperature: 12-bit measurement (°C)
– –40 °C to 85 °C
• Programmable interrupts
• Autonomous data acquisition
– Embedded 32-sample FIFO
– Data logging up to 12 days using the FIFO
– One-second to nine-hour data acquisition rate
• 1.95 V to 3.6 V supply voltage, internally regulated
• 1.6 V to 3.6 V digital interface supply voltage
• Operating temperature from −40 °C to +85 °C
Applications
• High-accuracy altimetry and barometry
• Smartphones, tablets and wearable devices
• GPS applications: dead reckoning, map assist, navigation, enhancement for
emergency services
• Weather station equipment