TIPGA450-Q1超声波汽车倒车解决方案

作者：时间：2012-06-09 来源：网络

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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