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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)： | 151/162頁 |
| 文件大?。?/td> | 4316K |
| 代理商： | PPXY8300A6T1 |
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MPXY8300 Series
Sensors
Freescale Semiconductor
89
12.3
MCU Direct Mode
In the MCU direct mode, the LFR detector block is enabled and user software can directly monitor the data coming from the
detector (LFDO status bit). The decoder is bypassed. User software can control the LFR detector using the LFEN bit. The level
of sensitivity can be adjusted with the LFLVL bit. The automatic gain control function of the detector block will be enabled. User
software should allow time, tACQ before monitoring LFDO. The bandpass pass filter will be enabled and can be monitored by
reading the LFBF bit.
In MCU direct mode, the LFR decoder turns on the MFO in the MCU bus clock domain when LFEN is set. After two rising edges
of the MFO clock the LFR detector is turned on.
In the MCU direct mode the auto-zero function in the amplifier will only be activated when:
the LFR detector is powered up from an off state
when the LFDO output of the LFR detector goes from a one to zero.
This auto-zero function takes 4 MFO periods (approximately 32
μsec) to complete. At high temperatures (>100°C) it will be
necessary for user software to reset the module to execute an auto-zero operation when there is no activity being detected.
The LFS[3:0] bits are ignored in the MCU direct mode.
12.4
Carrier Detect Mode
In the carrier detect mode the LFR detector is periodically powered up to sample the signals applied to the LFR detector.
In this mode the MFO and LFR detector remain turned on during the tLFON time. In this case the value of the tLFON time is defined
by the LFON bit. The LFR decoder turns on the LFR detector and MFO on a rising edge of the LFO clock as shown in Figure 12-2.
The first nine MFO cycles are used to make the LFR initialization and includes the start-up time of the MFO, the time the LFR
detector needs to make an auto-zero and the time that the LFR decoder needs to start sampling.
The LFR detector remains turned on for a period of tLFON - 2 cycles of the MFO. In this case, the value of tLFON time is defined
by the LFON bit. Following the detector on time the detector remains off or reset for a time period, tRST, set by the LFRST and
LFS[3:0] control bits.
The periodic rate of the sampling, tSAMPLE, is defined as:
Examples of the tLFON, tRST and tSAMPLE timing are shown in Figure 12-3 and Figure 12-4 for the two cases of the LFON bit.
Figure 12-2 LFR Initialization in Carrier Detect Mode
t
SAMPLE
t
LFON
t
RST
+
=
MFO Clock
MFO Enable
LFR Detector
Enable
tLFON
Initialization
LFO Clock
9 x MFO
Time
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