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)： 140/162頁
文件大?。?/td> 4316K
代理商： PPXY8300A6T1
MPXY8300 Series
Sensors
Freescale Semiconductor
79
NOTE
The triggering of the ADC10 is shared with the ACI for the acceleration measurements. Both a pressure
measurement and acceleration measurement cannot be started before the ADC10 is triggered as there is no
status bit to define whether the PCI or the ACI triggered the reading that was captured and converted by the
ADC10.
10.4
Temperature Measurements
The MPXY8300 Series measures temperature in all members of the family. The temperature is measured from a
ΔVB sensor
built into channel 1 of the ADC10. Obtaining a temperature measurement is done using the REIMS_READ_COMP_TEMP_8
firmware subroutine as described in Section 14. This subroutine sequences the correct bits to obtain a temperature dependent
voltage and convert it to the transfer function specified in Section 17.
The output of this measurement can be used as an over temperature shutdown to prevent RF transmissions and save power
during very high temperature conditions which might over stress the battery. This over temperature shutdown software can also
set up a restart when the temperature is once again less than the temperature restart level, TNORM, using the temperature restart
circuit as described in Section 10.7.2.
The output values of $00 or $FF from the calculated temperature measurement are considered fault codes. Further, any
calculated value of temperature below -40
°C or above 125°C will be converted to the $00 or $FF fault code respectively. The
transfer function for temperature versus an 8-bit result from the REIMS_READ_COMP_TEMP_8 firmware is:
NOTE
The accuracy, power consumption and timing specified for a temperature measurement in the electrical
specifications in Section 17 are only guaranteed if the user obtains a temperature reading using the firmware
subroutine call, REIMS_READ_COMP_TEMP_8.
Faults in the temperature sensor that result in a reading less than the minimum level (-40
°C) or greater than the maximum level
(125
°C) 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 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 the tire will rise after the tire has been in motion for some period of time. Lack of a temperature rise during
the first few minutes of tire motion may be an indication of a failed temperature sensor.
10.5
Voltage Measurements
Voltage measurements can be made on the internal bandgap to estimate the supply voltage on VDD.
10.5.1
Internal Bandgap
An internal bandgap voltage reference is provided to take measurements of a supply voltage. This voltage measurement is taken
directly by the ADC10 converter using channel 2 as the bandgap reference is always powered up during any ADC10 conversion.
Obtaining a calculated VDD voltage measurement based on the bandgap reference is done using the
REIMS_READ_COMP_VOLTAGE firmware subroutine as described in Section 14. This subroutine sequences the correct bits
to obtain a voltage measurement and convert it to the transfer function specified in Section 17.
The output values of $00 or $FF from the calculated voltage measurement are considered fault codes. Further, any calculated
value of voltage below 2.1V or above 3.6V will be converted to the $00 or $FF fault code respectively. The transfer function for
voltage versus an 8-bit result from the REIMS_READ_COMP_VOLTAGE firmware is:
TT
CODE
55
–
=
PV
×
nR
×
T
×
=
T0.01
T
CODE
1.22
+
×
=
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