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)： 150/162頁
文件大小： 4316K
代理商： PPXY8300A6T1
MPXY8300 Series
Sensors
88
Freescale Semiconductor
Figure 12-1 LF Receiver with Automatic Gain Control Block Diagram
12.2
Functional Description
12.2.1
Write to the LFR Registers
The user can always write to the LFEN, LFAGC, LFDFAK, LFCFAK and LFIG bits regardless of the status of LFEN.
A write to registers: LFCA0, LFCA1, LFCB0, LFCB1, LFCR and LFCS0 (LFIE, LFRST, LFWU8 and LFLVL bits) is effective only
if LFEN is zero. It is possible to write to LFCS0 in one instruction to both set LFEN and set or clear the other control bits in that
register.
12.2.2
LFR Modes of Operation
The LFM1 and LFM0 bits define the LFR mode of operation:
MCU Direct
Carrier Detect
Manchester Data
The LFR can be active in any of the low power modes: stop1, stop2, stop3, and stop4
The function of the LFR module is summarized in Table 12-1.
Table 12-1 LF Decoder Modes
Decoding
Mode
Data
Received
LFR
Sensitivity
LF AGC
Enabled
MCU
Control
Detector
Sampling Rate
LFR Detector On Time
LFON = 1
LFON = 0
MCU Direct
Determined by
MCU software
monitoring LFDO
Selected by
LFLVL
Yes
Full control Continuous on or
off selected by
LFEN
N/A
Carrier Detect
No
Interrupt
driven
Selected by
LFS[3:0]
265 (256 + 9)
MFO periods
(approximately
2120
μs)
25 (16+9) MFO
periods
(approximately
200
μs)
Manchester
Data
Yes
With no data detected
approximately 200
μs
6
AGC_LEVEL
DATA OUT
MFO = ~125 kHz
SENSITIVITY_LEVEL
LFO= ~1 kHz
~250 kHz
DETECTOR
SUB-BLOCK
DIFFERENTIAL
AMPLIFIER
W/ AGC
COMPARATOR
STAGE
SAMPLE AND
HOLD
BIT TIMING
DECODER
STATE
-MACHINE
REGISTERS
AND CONTROL
LOGIC
BUS
INTERF
ACE
LOG
IC
TO CPU
BUS
AGC0:5
LFS0:3
CARRIER FREQUENCY
DIGITAL BANDPASS
FILTER
(LFDO)
DECODER
SUB-BLOCK
INPUT
PINS
LFLVL
WAKEUP
TIMER
LFEN
CARRIER_ERROR
FEEDBACK
x3
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