Freescale 公司的MPL115A是数字输出的绝对压力传感器,集成了MEMS压力传感器和调理IC,压力测量从50 到115 kPa,集成的ADC提供经由I2C端口的数字化的温度和压力传感器输出,工作电压从2.375V到5.5V. MPL115A可用在气压测定仪,高度计,气象站,硬盘驱动器(HDD),工业设备,健康检测,以及空气控制系统.本文介绍了MPL115A的主要特性,方框图以及I2C 和SPI MPL115A接口板电路图.

The MPL115A2 is an absolute pressure sensor with digital output for low cost applications. A miniature 5x3x1.2 mm LGA package ideally suits it for portable electronics and space constrained applications. Low current consumptions of 5uA during Active mode and 1uA during Shutdown (Sleep) mode target battery and other low-power applications. A wide operating temperature range from -40℃ to +105℃ fits demanding environmental requirements.

MPL115A2 employs a MEMS pressure sensor with a conditioning IC to provide accurate pressure measurement from 50 to 115 kPa. An integrated ADC provides digitized temperature and pressure sensor outputs via an I2C port. Calibration Data is stored in internal ROM. Utilizing raw sensor output, the host microcontroller executes a compensation algorithm to render Compensated Absolute Pressure with 1 kPa accuracy.

The MPL115A2 pressure sensor’s small form factor, low power capability,precision, and digital output optimize it for barometric measurement applications.

MPL115A2主要特性:

Digitized pressure and temperature information together with programmed calibration coefficients for host micro use.

Factory Calibrated

50 kPa to 115 kPa Absolute Pressure

1 kPa Accuracy

2.375 V to 5.5 V Supply

Integrated ADC

I2C Interface

Monotonic Pressure and Temperature Data Outputs

Surface Mount RoHS Compliant Package

MPL115A2应用:

Barometry (portable and desk-top)

Altimeters

Weather Stations

Hard Disk-Drives (HDD)

Industrial Equipment

Health Monitoring

Air Control Systems



图1.MPL115A2方框图



图2.SPI MPL115A接口板电路图



图3.I2C MPL115A接口板电路图