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Pressure
Coefficient Bit-Width Specs
The table below specifies the initial coefficient bit-width specs for the compensation algorithm.
10-bit Output: Compensation Coefficient Specs
Total Coeff.
Bits
a0
b1
b2
c12
Total Bits
Sign Bits
Integer Bits
Fractional Bits
dec pt zero pad
16
1
12
4
—
16
1
2
13
—
16
1
1
14
—
14
1
0
13
9
62
* Factory reserves the option to make these values = 0.
Example Binary Format Definitions:
1.
2.
Sign = 0, Integer Bits = 8, Fractional Bits = 4 :
Sign = 1, Integer Bits = 4, Fractional Bits = 7 :
Coeff = S I 7 I 6 I 5 I 4 I 3 I 2 I 1 I 0 . F 3 F 2 F 1 F 0
Coeff = S I 3 I 2 I 1 I 0 . F 6 F 5 F 4 F 3 F 2 F 1 F 0
3.
4.
Sign = 0, Integer Bits = 0, Fractional Bits = 6, dec pt zero pad = 2 : Coeff = S 0 . 0 0 F 5 F 4 F 3 F 2 F 1 F 0
Sign = 0, Integer Bits = 0, Fractional Bits = 5, dec pt zero pad = 3 : Coeff = S 0 . 0 0 0 F 4 F 3 F 2 F 1 F 0
NOTE: Negative coefficients (Sign = 1) are coded in 2’s complement notation.
Coefficient Address Map
Address
$04
$05
$06
$07
$08
$09
$0A
$0B
Coefficient
a0 MS Byte
a0 LS Byte
b1 MS Byte
b1 LS Byte
b2 MS Byte
b2 LS Byte
c12 MS Byte
c12 LS Byte
For coefficients with less than 16 bits, the lower LSBs are zero. For example, c14 is 14 bits and is stored into 2 bytes as follows:
c14 MS byte = c14[10:3] = [c14 b13 , c14 b12 , c14 b11 , c14 b10 , c14 b9 , c14 b8 , c14 b7 , c14 b6 ]
c14 LS byte = c14[2:0] & “00000” = [c14 b5 , c14 b4 , c14 b3 , c14 b2 , c14 b1 , c14 b0 , 0 , 0]
MPL015A2
Sensors
4
Freescale Semiconductor
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