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3.6
Example of SPI Reading of Coefficients
These are MPL115A1 SPI commands to read coefficients, execute Pressure and Temperature conversions, and to read Pressure
and Temperature data. The sequence of the commands for the interaction is given as an example to operate the MPL115A1.
Utilizing this gathered data, an example of the calculating the Compensated Pressure reading is given in floating point notation.
SPI Commands (simplified for communication)
Command to Write “Convert Pressure and Temperature” = 0x24
Command to Read “Pressure ADC High byte” = 0x80
Command to Read “Pressure ADC Low byte” = 0x82
Command to Read “Temperature ADC High byte” = 0x84
Command to Read “Temperature ADC Low byte” = 0x86
Command to Read “Coefficient data byte 1 High byte” = 0x88
Read Coefficients:
[CS=0], [0x88], [0x00], [0x8A], [0x00], [0x8C], [0x00], [0x8E], [0x00], [0x90], [0x00], [0x92], [0x00], [0x94], [0x00], [0x96], [0x00],
[0x00], [CS=1]
Start Pressure and Temperature Conversion, Read raw Pressure:
[CS=0], [0x24], [0x00], [CS=1], [3 ms Delay]
[CS=0], [0x80], [0x00], [0x82], [0x00], [0x84], [0x00,] [0x86], [0x00], [0x00], [CS=1]
NOTE: Extra [0x00] at the end of each sequence to output the last data byte on the slave side of the SPI.
Figure 4. SPI Read Coefficient Datagram
a0 coefficient MSB
= 0x41
a0 coefficient LSB
b1 coefficient MSB
= 0xDF a0 coefficient
= 0xB0
= 0x41DF
= 2107.875
b1 coefficient LSB
= 0x28
b1 coefficient
= 0xB028
= -2.49512
b2 coefficient MSB
= 0xBE
b2 coefficient LSB
= 0xAD b2 coefficient
= 0xBEAD =
-1.02069
c12 coefficient MSB = 0x38
c12 coefficient LSB
= 0xCC c12 coefficient = 0x38CC = 0.00086665
MPL115A1
Sensors
Freescale Semiconductor, Inc.
9
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