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| 型号： | APGRD003 |
| 厂商： | Microchip Technology |
| 文件页数： | 18/42页 |
| 文件大小： | 0K |
| 描述： | KIT TPMS REFERENCE DESIGN |
| 标准包装： | 1 |
| 类型： | 汽车 - 轮胎压力监视器 |
| 频率： | 433.92MHz |
| 适用于相关产品： | PIC18F4680，PIC18F2680，MCP2030 |
| 已供物品： | 基站、低频起始器板和轮胎压力传感器节点 |
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Tire Pressure Monitoring System User’s Guide
3.4
TRANSPONDER SENSOR MODULE
3.4.1
Technical Specifications
Modulation Format:
Encoding Method:
Operating Voltage:
Low Voltage Alert Threshold:
Stand By Current With 3 LF Input
Channels Enabled (PIC & AFE):
UHF Transmitting Frequency:
UHF Transmission Baud Rate (TE):
UHF Range:
LF Frequency:
LF Input Sensitivity:
LF Range:
Pressure Sensor Type:
Pressure Sensor Range:
Pressure Sensor Temperature
Range:
ASK
PWM
2.3 - 3.3V
2.3V
~12 μ A
433.92 MHz
100, 200, 400, 800 μ s selectable,
system default is 400 μ s
~ 10 Meters
125 kHz
~3 mVPP
Up to 3 Meters
Analog
1 -7 bars absolute
-40 - 125°C
3.4.2
3.4.2.1
Hardware Overview
MICROCONTROLLER
The microcontroller used is the PIC16F684. The internal 10-bit ADC is used for
pressure, temperature and battery measurements. It also interfaces with the MCP2030
for configuration and LF communications. Other PICmicro MCUs can be selected
based on design requirement.
3.4.2.2
LF RECEIVER (125 kHZ)
The LF signal processing is handled with the Microchip's three-channel Analog Front
End (MCP2030). The MCP2030 has a user-configurable input filter to process the
incoming LF challenges.
3.4.2.3
HF TRANSMITTER (433.9 MHZ)
The HF transmitter is used for transmitting data to the base station module. A surface
mounted SAW resonator is used to generate the carrier frequency which is controlled
by the output pin of the microcontroller.
3.4.2.4
PRESSURE SENSOR
The sensor implemented in this design is an analog pressure sensor (MS5407-AM)
from Intersema. The two output of the sensor, V+ and V-, will output voltages levels that
correspond to the changes in pressure. The sensor is powered by RA1 pin of the
microcontroller and is in the off state when not taking measurement.
3.4.2.5
SENSOR SIGNAL AMPLIFICATION
The two outputs of the pressure sensors are connected to the differential gain circuitry
using the MCP6273. The output of the differential gain signal is amplified by 10 and
then passed into the 10-bit ADC module in the microcontroller for conversion. The gain
of the signal is controlled by the values of R9, R10, R11 and R12. Refer to
A.13 “Circuit Block Figure” .
DS51624B-page 14
? 2006 Microchip Technology Inc.
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相关代理商/技术参数 |
参数描述 |
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| APGRD004 | 功能描述:开发板和工具包 - PIC / DSPIC Auto Ambient Lighting Module RoHS:否 制造商:Microchip Technology 产品:Starter Kits 工具用于评估:chipKIT 核心:Uno32 接口类型: 工作电源电压: |
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