Datasheet > AN3956

AN3956

更新时间： 2022-12-20 04:40:18

品牌	Logo	应用领域
飞思卡尔 - FREESCALE		传感器
页数	文件大小	规格书
20页	392K
描述
DEMOAPEXSENSOR Usage Altitude Pressure EXperimental (APEX) Sensor Board

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数据手册

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AN3956 数据手册

MMA7360Q

3 Axis XYZ

12 bit

Accelerometer

20x4 Character

LCD Display

12 bit MPXV5004

Integrated

Menu Buttons

Pressure

Sensor

JM60

8-bit S08 MCU

12-bit ADC

60k Flash

USB

MPL115A2

(I2C)

24-bit

ADC

Converter

Instrumentation

Amplifier

Gain=98.8

MPXM2102

Compensated

Pressure

12 bit

Temp

Sensor

Figure 2. Simplified Block Diagram

Figure 2 is a simplified block diagram of the DEMOAPEXSENSOR. The sensors with analog outputs (Table 1) are sampled

via the JM60 microcontroller’s 12-bit ADC. The exception is the MPXM2102A absolute pressure sensor. This is used for altitude

so it requires a high resolution sampling. It passes through an instrumentation amplifier and then is interfaced via an external

24-bit ADC chipset before communication via SPI to the JM60 MCU. The JM60 interfaces with the LCD screen and processes

inputs by the user for the displayed output.

Several Algorithms are used to calculate functions on the DEMOAPEXSENSOR.

Information on implementing the MPL115A can be found in

AN3785, How to Implement the Freescale MPL115A Digital Barometer.

Implementing the MPL115A as a barometer and altimeter can be found in

AN3914, Modern Altimeter and Barometer System using the MPL115A.

More pressure sensor application notes can be found at: www.freescale.com/pressure.

AN3956

Sensors

Freescale Semiconductor

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