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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
?
圖4.評估板PGA450-Q1 EVM外形圖
圖5.評估板PGA450-Q1 EVM電路圖:LIN
圖6.評估板PGA450-Q1 EVM電路圖:電源
圖7.評估板PGA450-Q1 EVM電路圖:RS232
圖8.評估板PGA450-Q1 EVM電路圖:USB控制器
圖9.評估板PGA450-Q1 EVM電路圖: PGA450-Q1
圖10.評估板PGA450-Q1 EVM PCB布局圖:頂層
圖11.評估板PGA450-Q1 EVM PCB布局圖:底層
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