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參數(shù)資料
| 型號： | PPXY8300A6T1 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | Pressure Sensor |
| 英文描述： | DIFFERENTIAL, PEIZORESISTIVE PRESSURE SENSOR, RECTANGULAR, SURFACE MOUNT |
| 封裝： | SOIC-20 |
| 文件頁數(shù)： | 139/162頁 |
| 文件大小： | 4316K |
| 代理商： | PPXY8300A6T1 |
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MPXY8300 Series
Sensors
78
Freescale Semiconductor
Figure 10-1 PCI to P-Chip Block Diagram
The signal conditioning of the pressure sensor begins with a capacitance to voltage conversion (C-V) followed by a switched
capacitor amplifier. This amplifier has adjustable offset and gain trimming that is set by the trim register. The micro-machined
pressure transducer, C-V converter, sample-and-hold, buffer and trim registers are on the separate P-Chip silicon device
mounted within the MPXY8300 Series package.
The MCU contains four registers of control, status and trim bits. In addition the P-Chip is powered up through the general purpose
I/O driver. The proper sequencing of these bits are handled by the REIMS_READ_COMP_PRESSURE firmware subroutine
described in Section 14.
The output values of $000 or $1FF from the calculated pressure measurement are considered fault codes. Further, any calculated
value of pressure below minimum calibrated range or above the maximum calibrated range will be converted to the $001 or $1FF
codes respectively. The transfer function for pressure versus an 9-bit result from the REIMS_READ_COMP_PRESSURE
firmware depends on the calibrated range of the device.
For the 100-450 kPa range the transfer function is:
For the 100-800 kPa range the transfer function is:
For the 100-1500 kPa range the transfer function is:
NOTE
The accuracy, power consumption and timing specified for a pressure measurement in the electrical
specifications in Section 17 are only guaranteed if the user obtains a pressure reading using the firmware
subroutine call, REIMS_READ_COMP_PRESSURE.
Faults in the pressure sensor that result in a reading less than the minimum level or greater than the maximum calibrated level
will result in the firmware making the output value zero. An output code of zero or 255 are considered fault codes.
Another cross check is that can be performed is that there should be a change in pressure in the presence of a change in
temperature. Therefore the user software should cross check the pressure and temperature readings to determine if the device
is responding to the Ideal Gas Law:
The temperature within a tire will rise after the tire has been in motion for some period of time. This rise in temperature should
be accompanied by a rise in pressure. Lack of this pressure rise may be an indication of a plugged pressure port or damaged
pressure sensing diaphragm.
P-CHIP
INTERFACE
PX
P-CHIP
MCU DATA BUS
VPR
CONTROL
fMFO
MFO
8
μSec
ADC10
VOUT
AD0
TRIG
P
0.686
P
CODE
99.314
+
×
=
P
1.375
P
CODE
98.625
+
×
=
P
2.751
P
CODE
97.250
+
×
=
PV
×
nR
×
T
×
=
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