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The polynomial can be evaluated ( Equation 1 ) as a sequence of 3 MACs:
Pcomp = a0 + ( b1 + c12 ? Tadc ) ? Padc + b2 ? Tadc
b1
c12
Tadc
a0
Padc
a1
y1
b2
y
PComp
Tadc
Please refer to Freescale application note AN3785 for more detailed notes on implementation.
3.4
SPI Device Read/Write Operations
All device read/write operations are memory mapped. Device actions e.g. “Start Conversions” are controlled by writing to the
appropriate memory address location. All memory address locations are 6-bit (see Table 2 ).
The 8-bit command word comprises:
? the most significant bit which is the Read/Write identifier which is '1' for read operations and '0' for write operations.
? the 6-bit address (from Table 2 );
? the least significant bit which is not used and is don't care (X).
The device write commands are shown in Table 3 .
Table 3. SPI Write Command
Start Conversions
Command
Binary
0010010X
HEX (1)
0x24
X = don’t care
1. The command byte needs to be paired with a 0x00 as part of the SPI exchange to complete the passing of Start
Conversions .
The actions taken by the part in response to each command are as follows:
Table 4. SPI Write Command Description
Command
Start Conversions
Action Taken
Wake main circuits. Start clock. Allow supply stabilization time. Select pressure sensor input.
Apply positive sensor excitation and perform A to D conversion. Select temperature input.
Perform A to D conversion. Load the Pressure and Temperature registers with the result. Shut
down main circuits and clock.
MPL115A1
Sensors
Freescale Semiconductor, Inc.
7
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