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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)： | 149/162頁 |
| 文件大小： | 4316K |
| 代理商： | PPXY8300A6T1 |
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MPXY8300 Series
Sensors
Freescale Semiconductor
87
SECTION 12 LF RECEIVER
This module provides an interface between magnetic field communication transmissions (typically at 125 kHz) and the MCU. Two
pins are connected to a receiver coil located on the printed circuit board. When a magnetic field is present, low level voltages are
applied to the input pins. The module amplifies the signal and determines whether the proper carrier frequency is present. If valid
information is detected, the module will provide an interrupt request to the CPU. If no signal is detected or the information is
invalid, the module will return to a very low power state and periodically wake-up and sample the input.
The module may be placed in three modes:
Carrier detect mode — This mode determines whether the received signal is above a certain amplitude, is present for a
minimum duration, and has a carrier frequency between a minimum and maximum level. If the three criteria are met, the
CPU receives an interrupt request.
Manchester data mode — This mode is for receiving Manchester coded information. The information being transmitted will
be modulated using on/off keying and will have a carrier frequency of approximately 125 kHz. The module will use automatic
gain control to acquire and track the incoming signal, which may vary greatly due to changes in antenna distance and
orientation from the transmitter. The module will monitor: amplitude, carrier frequency, decoded bit timing, and message ID.
If all of the criteria are met, the CPU will be interrupted when each byte of information is available.
Direct access mode — This mode is provided primarily for system development when the antenna characteristics are being
analyzed. In this mode, the CPU is directly provided the demodulated data stream. As in Manchester data mode, automatic
gain control will be used to acquire and track the input waveform.
The module provides a programmable periodic wake-up mechanism for carrier and Manchester data modes. This allows the
module to be normally in a very low power state and to periodically wake-up to sample for incoming information. In direct access
mode, the module will stay active. The block diagram of the module is shown in Figure 12-1. The module is divided into two sub-
blocks:
Detector — Analog and digital sub-block that performs:
Signal amplification
On/off keying demodulation
Carrier frequency digital bandpass filter
Automatic gain control
Decoder — Digital logic that performs:
Interface to the CPU bus
Manchester bit timing decoding
Wake-Up timing
12.1
External Signal Description
12.1.1
Modulated Signal input
Two port pins act as inputs to the LFR detector.
12.1.2
Clock inputs
A medium frequency oscillator (MFO) of approximately 125 kHz will be provided to the module to clock the logic of the decoder.
A frequency doubled version of the MFO is supplied to the detector. The MFO will have an enable signal from the LFR module.
A low frequency oscillator (LFO) of approximately 1 kHz will be provided to the module at all times in all MCU modes of operation.
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| PPYY12C0.75 | 制造商:Farnell / Pro-Power 功能描述:CABLE YY 12 CORE 0.75MM PER M 制造商:pro-power 功能描述:CABLE, YY, 12 CORE, 0.75MM, PER M 制造商:PRIVATE LABEL 功能描述:CABLE, YY, 12 CORE, 0.75MM, PER M, No. of Conductors:12, Voltage Rating:500V, No 制造商:pro-power 功能描述:CABLE, YY, 12 CORE, 0.75MM, PER M, No. of Conductors:12, Voltage Rating:500V, No. of Max Strands x Strand Size:-, Conductor Area CSA:0.75mm2, Jacket Colour:Grey, Jacket Material:PVC (Polyvinyl Chloride), External Diameter:9.9mm, |
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| PPYY12C0.75 50M | 制造商:Farnell / Pro-Power 功能描述:CABLE YY 12 CORE 0.75MM 50M 制造商:pro-power 功能描述:CABLE, YY, 12 CORE, 0.75MM, 50M |
| PPYY12C1.50 | 制造商:Farnell / Pro-Power 功能描述:CABLE YY 12 CORE 1.5MM PER M 制造商:pro-power 功能描述:CABLE, YY, 12 CORE, 1.5MM, PER M |
| PPYY12C1.50 50M | 制造商:Farnell / Pro-Power 功能描述:CABLE YY 12 CORE 1.5MM 50M 制造商:pro-power 功能描述:CABLE, YY, 12 CORE, 1.5MM, 50M |
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