原标题：TI PGA450-Q1超声波汽车倒车解决方案涵电路图

　　TI 公司的PGA450-Q1是全集成超声波传感器接口器件,集成了电压稳压器,12位SAR ADC,8位微控制器,数字带通滤波器,DAC,两个NMOS低边驱动器,低噪音放大器,振荡器,LIN 2.1物理接口协议接口.主要用于汽车泊车, 盲区检测和物体检测.本文介绍了PGA450-Q1主要特性,功能方框图, 应用电路图, 评估板PGA450-Q1 EVM主要特性,电路图和PCB布局图.

　　The PGA450-Q1 is a fully integrated interface device for ultrasonic transducers used in automoTIve park distance or object detecTIon applicaTIons. It incorporates these system blocks: voltage regulators, a 12-bit SAR ADC, an 8-bit microcontroller, a digital band-pass filter, a DAC, dual NMOS low-side drivers, a low-noise amplifier, an oscillator, and a LIN 2.1 physical interface and protocol for interfacing.

　　The PGA450-Q1 possesses an 8-bit microcontroller and OTP memory for program storage for processing the echo signal and calculaTIng the distance between the transducer and the object. This data is transmitted through the LIN 2.1 communication protocol. The LIN 2.1 physical layer is slave-only and does not implement the LIN wake-up feature.

　　PGA450-Q1主要特性:

　　Dual NMOS Low-Side Drivers

　　Configurable Burst Generator

　　Low-Noise Amplifier

　　12-Bit SAR ADC

　　Configurable Digital Band-Pass Filter

　　Digital Signal Envelope Detect

　　On-Chip 8-Bit Microprocessor

　　LIN 2.1 Physical Interface and Protocol

　　Watchdog Timer

　　Four-Wire SPI for Testability / Programming

　　8K Bytes OTP

　　768 Bytes of FIFO RAM

　　256 Bytes Scratchpad RAM

　　8K Bytes of Development RAM

　　32 Bytes of EEPROM for Application

　　PGA450-Q1应用:

　　Automotive Park Distance

　　Blind Spot Detection

　　Object Detection Applications

　　图1.PGA450-Q1功能方框图

　　The digital data path has the following components:

　　• Band-pass filter

　　• Rectifier

　　• Peak extractor

　　• Downsampler

　　• Low-pass filter

　　图2.PGA450-Q1数字数据通路方框图

　　图3.PGA450-Q1应用电路图

　　评估板PGA450-Q1 EVM

　　This user’s guide describes the characteristics, operation, and use of the PGA450-Q1 EVM.

　　评估板PGA450-Q1 EVM主要特性:

　　• Single power-supply input for basic operation

　　• Example single-ended transformer and 58-kHz transducer

　　• LIN master transceiver

　　• RS-232 transceiver for UART testing and debug

　　• PC control with a graphical user interface and USB communications board

　　图4.评估板PGA450-Q1 EVM外形图

　　图5.评估板PGA450-Q1 EVM电路图:LIN

　　图6.评估板PGA450-Q1 EVM电路图:电源

　　图7.评估板PGA450-Q1 EVM电路图:RS232

　　图8.评估板PGA450-Q1 EVM电路图:USB控制器

　　图9.评估板PGA450-Q1 EVM电路图: PGA450-Q1

　　图10.评估板PGA450-Q1 EVM PCB布局图:顶层

　　图11.评估板PGA450-Q1 EVM PCB布局图:底层