MPL115A1 查看數據表（PDF） - Freescale Semiconductor
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MPL115A1 Datasheet PDF : 16 Pages
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Example Binary Format Definitions:
a0 Signed, Integer Bits = 12, Fractional Bits = 3 :
Coeff a0 = S I11 I10 I9 I8 I7 I6 I5 I4 I3 I2 I1 I0 . F2 F1 F0
b1 Signed, Integer Bits = 2, Fractional Bits = 13 :
Coeff b1 = S I1 I0 . F12 F11 F10 F9 F8 F7 F6 F5 F4 F3 F2 F1 F0
b2 Signed, Integer Bits = 1, Fractional Bits = 14 :
Coeff b2 = S I0 . F13 F12 F11 F10 F9 F8 F7 F6 F5 F4 F3 F2 F1 F0
c12 Signed, Integer Bits = 0, Fractional Bits = 13, dec pt zero pad = 9 : Coeff c12 = S 0 . 000 000 000 F12 F11 F10 F9 F8 F7 F6 F5 F4 F3 F2 F1 F0
Padc Unsigned, Integer Bits = 10 :
Padc U = I9 I8 I7 I6 I5 I4 I3 I2 I1 I0
Tadc Unsigned, Integer Bits =10 :
Tadc U = I9 I8 I7 I6 I5 I4 I3 I2 I1 I0
NOTE: Negative coefficients are coded in 2’s complement notation.
3.2 Compensation
The 10-bit compensated pressure output, Pcomp, is calculated as follows:
Pcomp = a0 + (b1 + c12 ⋅ Tadc) ⋅ Padc + b2 ⋅ Tadc
Eqn. 1
Where:
Padc is the 10-bit pressure ADC output of the MPL115A
Tadc is the 10-bit temperature ADC output of the MPL115A
a0 is the pressure offset coefficient
b1 is the pressure sensitivity coefficient
b2 is the temperature coefficient of offset (TCO)
c12 is the temperature coefficient of sensitivity (TCS)
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.
Pressure (kPa) = Pcomp ⋅
1----1---5-----–-----5---0--
1023
+ 50
Eqn. 2
3.3 Evaluation Sequence, Arithmetic Circuits
The following is an example of the calculation for Pcomp, the compensated pressure output. Input values are in bold.
c12x2 = c12 * Tadc
a1 = b1 + c12x2
a1x1 = a1 * Padc
y1 = a0 + a1x1
a2x2 = b2 * Tadc
Pcomp = y1 + a2x2
This can be calculated as a succession of Multiply Accumulates (MACs) operations of the form y = a + b * x:
a
+
y
b
X
x
MPL115A1
6
Sensors
Freescale Semiconductor, Inc.
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