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Pressure
VDD
VDD
1 μ F
Coefficient
ADDR
ADDR
CAP
CAP
1 μ F
Storage
ADDR
Diff
Amp
ADC
ADDR
ADDR
Pressure
Temperature
SHDN
SHDN
Temp
Sensor
I 2 C
Interface
SCL
SCL
SDA
SDA
4.7 k
4.7 k
μ C
Microcontroller
RST
RST
GND
GND
Figure 1. Block Diagram
Compensation
The 10-bit compensated pressure output, Pcomp, is calculated as follows:
Pcomp = a0 + (b1 + Padc + c12*Tadc) * Padc + (b2 + Tadc) * Tadc
Where:
Padc is the 10-bit pressure output of the MPL015A2 ADC,
Tadc is the 10-bit temperature output of the MPL015A2 ADC,
a0 is the pressure offset coefficient,
b1 is the pressure sensitivity coefficient,
c12 is the coefficient for temperature sensitivity coefficient (TCS),
b2 is the 1st order temperature offset coefficient (TCO),
Ideally, Pcomp will produce a value of 0 with an input pressure of 50 kPa and will produce a full-scale value of 1023 with an input
pressure of 115 kPa.
MPL015A2
Sensors
Freescale Semiconductor
3
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