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| 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)： | 29/162頁 |
| 文件大?。?/td> | 4316K |
| 代理商： | PPXY8300A6T1 |
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MPXY8300 Series
Sensors
124
Freescale Semiconductor
14.3
Definition of Signal Ranges
Each measured parameter (pressure, voltage, temperature, acceleration) results from an ADC conversion of an analog signal.
This ADC result may then be passed by the firmware to the application software as either the raw ADC result or further
compensated and scaled for an output between one and the maximum digital value minus one. The minimum digital value of zero
and the maximum digital value are reserved as error codes.
The signal ranges and their significant data points are shown in Figure 14-1. In this definition the signal source would normally
output a signal between SINLO and SINHI. Due to process, temperature and voltage variations this signal may increase its range
to SINMIN to SINMAX. In all cases the signal will be between the supply rails, so that the ADC will convert it to a range of digital
numbers between 0 and 1023. These digital numbers will have corresponding DINMIN, DINLO, DINHI, DINMAX values. The ADC
digital value is taken by the firmware and compensated and scaled to give the required output code range.
Digital input values below DINMIN and above DINMAX are immediately flagged as being out of range and generate error bits and
the output is forced to the 0 value.
Digital values below DINLO (but above DINMIN) or above DINHI (but not DINMAX) will most likely cause an output that would be less
than 1 or greater than 510, respectively. These cases are considered underflow or overflow, respectively. Underflow results will
be forced to a value of 1. Overflow results will be forced to a value of 510.
Digital values between DINLO and DINHI will normally produce an output between 1 to 510 (for a 9-bit result). In some isolated
cases due to compensation calculations and rounding the result may be less than 1 or greater than 510, in which case the
underflow and overflow rule mentioned above is used.
Table 14-3 Device ID Coding Descriptions
Field
Description
CODE0, 7:5
REV0:2
Revision number for the multiple-chip-module from 0 to 7.
CODE0, 7:5
PRG0:2
Calibrated range for pressure and acceleration. First code of $0 for 100-800 kPa, +/-10 x-axis acceler-
ometer and 0-60g z-axis accelerometer. Other codes to be assigned as produced.
CODE0, 1:0
SUPP0:1
Number of silicon device supplier from 0 to 3.
CODE1:4, 7:0
ID31:0
32-bit serial number for each device. All numbers to be unique, but numbering sequence to be deter-
mined by Freescale manufacturing process.
CODE5, 7:0
Reserved
Reserved for Freescale firmware description.
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