TIPGA450-Q1超聲波汽車倒車解決方案

作者：時間：2012-06-09 來源：網絡

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TI 公司的PGA450-Q1是全集成超聲波傳感器接口器件,集成了電壓穩壓器,12位SAR ADC,8位微控制器,數字帶通濾波器,DAC,兩個NMOS低邊驅動器,低噪音放大器,振蕩器,LIN 2.1物理接口協議接口.主要用于汽車泊車, 盲區檢測和物體檢測.本文介紹了PGA450-Q1主要特性,功能方框圖, 應用電路圖, 評估板PGA450-Q1 EVM主要特性,電路圖和PCB布局圖.
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應用:

Automotive Park Distance

Blind Spot Detection

Object Detection Applications

圖1.PGA450-Q1功能方框圖

The digital data path has the following components:

? Band-pass filter

? Rectifier

? Peak extractor

? Downsampler

? Low-pass filter

圖2.PGA450-Q1數字數據通路方框圖

圖3.PGA450-Q1應用電路圖

評估板PGA450-Q1 EVM

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

評估板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