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AN3956 Datasheet(PDF) 2 Page - Freescale Semiconductor, Inc |
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AN3956 Datasheet(HTML) 2 Page - Freescale Semiconductor, Inc |
2 / 20 page AN3956 Sensors Freescale Semiconductor 2 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. MPXV5004 Integrated Pressure Sensor MMA7360Q 3 Axis XYZ Accelerometer MPXM2102 Compensated Pressure Sensor 24-bit ADC Converter Temp Sensor JM60 8-bit S08 MCU 12-bit AD C 60k Flash USB 20x4 Character LCD Display 12 bit 12 bit Menu Buttons MPL115A2 (I2C) Instrumentation Amplifier Gain=98.8 12 bit |
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