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)： 155/162頁
文件大小： 4316K
代理商： PPXY8300A6T1
MPXY8300 Series
Sensors
92
Freescale Semiconductor
Figure 12-7 LF Carrier Detect Mode — LF Detector On Too Late
The sensitivity level, S, is selected by the LFLVL bit.
After the carrier detection time, tCD, is reached the LFR decoder sets the LFCF bit and LFR interrupt to the MCU (if the LFIE bit
is set). The LFR interrupt and the LFCF bit are cleared when a logical one is written to the LFCFAK bit.
When the tLFON period ends, the LFR decoder turns off the LFR detector and MFO, regardless of the length of time that the carrier
exists.
12.5
Manchester Data Mode
In the Manchester data mode the incoming data stream has each data bit defined by a time interval with either a rising or falling
edge in the middle of the time frame as shown in Figure 12-8. The rising and falling edge are determined by a signal level, S.
The nominal data rate is 4 kbits/sec which makes each data bit time, tDATA, approximately 250 μsec with a pulse width of 125
μsec. Data rates covering the complete range of Dr(min) to Dr(max) kbits/sec must be decoded as valid Manchester data. Data
rates below FDATA_L and above FDATA_H will always be rejected.
A logical one is defined as no LF carrier present for the first half of the bit time; and a logical zero is defined as a LF carrier present
for the first half of the bit time as shown in Figure 12-8.
Figure 12-8 Manchester Bit
The format of the complete Manchester datagram is shown in Figure 12-9. It is comprised of a preamble, a synchronization
period, a wake-up code, and at least one data byte.
tCD
S
LF Carrier
LFR Interrupt
LFDO
LFCF
tLFON
MFO and
Enables
LFR Detector
Initialization Time
tDATA
0.5 tDATA
tDATA
0.5 tDATA
LF Input
Logic “1”
Logic “0”
Data Bit
S
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