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)： 143/162頁
文件大小： 4316K
代理商： PPXY8300A6T1
MPXY8300 Series
Sensors
Freescale Semiconductor
81
The output values of $00 or $FF from the calculated acceleration measurement are considered fault codes. Further, any
calculated value of acceleration outside the calibrated range of operation will be converted to the $00 or $FF fault code. The
transfer function for X-axis acceleration versus an 9-bit result from the REIMS_READ_COMP_ACCEL_X firmware is:
The transfer function for Z-axis acceleration versus an 9-bit result from the REIMS_READ_COMP_ACCEL_Z firmware is:
NOTE
The accuracy, power consumption and timing specified for an acceleration measurement in the electrical
specifications in Section 17 are only guaranteed if the user obtains an acceleration reading using the firmware
subroutine call, REIMS_READ_COMP_ACCEL_X/Z.
NOTE
The triggering of the ADC10 is shared with the PCI for the pressure 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.
NOTE
The trim data in the ACITM0:3 registers (accessed using the ATD0:7, ATMRW, and the ATMSEL0:1 bits) should
not be altered directly with the MCU. These bits should only be updated from FLASH memory using the
REIMS_ACITD firmware routine.
The accelerometers can be cross checked against each other to determine any permanent faults. The X-axis accelerometer
should be cycling +/- 1g at a rate up to 50 Hz, if the Z-axis accelerometer is indicating any continuous acceleration over 5g.
Similarly, the Z-axis accelerometer should indicate less than 5g if the X-axis accelerometer indicates no cycling greater than 1g.
10.7
Thermal Shutdown
When the package temperature becomes too low or too high the MCU can go into a stop mode to suspend operation and prevent
transmission of RF signals which may be corrupted at the temperature extremes.
10.7.1
Low Temperature Shutdown
Low temperature shutdown is achieved using temperature readings taken by the ADC10 as described in Section 10.1. When the
software programmed low temperature is reached the MCU will set a bit in the parameter registers, turn off the RFX and enter
the Stop1 mode. The PWU will restart the MCU which will check the flag bit first. If set the MCU will first check the temperature
to determine if the shutdown should continue.
10.7.2
High Temperature Shutdown
The high temperature shutdown level is determined from a measurement of the temperature sensor by the ADC10 as described
Normally the user software will determine when to shutdown and then turn off all power and place the MCU in the stop1 mode.
The MCU, temperature sensor, ADC10 and PWU are all functional over the full temperature range from TL to TH.
The MCU can be restarted by the Temperature Restart (TR) module when the temperature falls back below a lower temperature
level, TRESET. When this occurs the MCU will be reset and begin execution from the reset vector located at $DFFE/$DFFF. The
TR module cannot activate an MCU reset unless it has first risen above a higher temperature, TREARM, as shown in Figure 10-3.
Both TRESERT and TREARM as the limits of the nominal detection level of TNORM.
The status of the TR can be checked by reading the TRO bit located at bit 0 in the SIMTST register at address $180F. The TRO
bit is set high by an MCU reset. The state of the TRO bit is as follows:
1 = TR module has reached the TREARM temperature and will restart the MCU if the temperature falls back below
the TRESET temperature.
0 = TR module has been below the TRESET temperature and cannot restart the MCU. The MCU will NOT go into
either the stop1 or stop2 mode.
A
0.039
A
CODE
10.039
–
×
=
A
0.118
A
CODE
0.118
–
×
=
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