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| 型号： | APGRD003 |
| 厂商： | Microchip Technology |
| 文件页数： | 17/42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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Hardware Overview
3.3
LOW FREQUENCY INITIATOR MODULE
3.3.1
Technical Specifications
LF Transmitting Frequency:
Connectivity:
125 kHz
LIN or CAN, LIN is used for this design
3.3.2
System Overview
The LF Transmitter is derived from the design described in Application Note AN232,
"Low Frequency Magnetic Transmitter Design" (DS00232).
The hardware design of the LF Initiator module is identical to the LF module used in
Microchip PKE reference design (APGRD001). Refer to Chapter 2 of the “PKE
Reference Design User Guide” for more information on this module. Refer to
Appendix A. “Schematic and Layouts” .
3.3.3
Operation Overview
LF Initiator is connected to Base Station Module through the LIN network. Each LF
Initiator is assigned a unique ID which is also used by the system to distinguish the tire
location during normal operation. Once a command from the Base Station has been
received, the LF Initiator transmits a wake-up challenge to the Transponder Sensor
module via a 125 kHz modulated signal. The format of the signal is user configurable
and also depends on the configurations of the AFE output filter on the Transponder
Sensor module.
Refer to 3.4.3.3 “LF Message Overview” for detail description of the LF message
formatting.
3.3.4
Reference Material
Refer to Recommended Reading in the Preface section.
? 2006 Microchip Technology Inc.
DS51624B-page 13
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