4.1 传感器................................................................................................................10
英飞凌的 SP12，SP12T,SP30 .............................................................................10
飞思卡尔的 MPXY8300 系列 .............................................................................11
4.1.3 GE 的 NPX 系列..........................................................................................12
三种传感器比较...................................................................................................12
4.2 MCU ...................................................................................................................13
4.3 RF 射频收发芯片...............................................................................................13
模块简介：...........................................................................................................13
模块电气特性.......................................................................................................14
4.3.3 模块引脚说明.............................................................................................14
4.3.4 模块与单片机接口电路.............................................................................15
4.3.5 工作模式控制.............................................................................................16
4.3.6 数据和控制接口.........................................................................................16
4.4 MC33690 ............................................................................................................17
特点.......................................................................................................................17
4.4.2 引脚图.........................................................................................................18
4.5 供电电源............................................................................................................18
4.6 天线....................................................................................................................18
4.7 液晶屏................................................................................................................19
4.8 结论....................................................................................................................19
5 系统关键问题的解决 ..........................................................................20
5.1 功耗问题............................................................................................................20
5.2 轮胎定位问题....................................................................................................20
5.3 NRF24L01 跳频接收 .........................................................................................21
6 硬件设计 ..............................................................................................22
6.1 传感器部分电路设计........................................................................................22
采样端 RF 发射部分电路设计 ...............................................................................22
6.3 低频信号接收电路............................................................................................23
