TIPGA450-Q1 Ultrasonic Car Reversing Solution

TI's 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. It is mainly used for automotive parking, blind spot detection and object detection. This article introduces the main features of PGA450-Q1, functional block diagram, application circuit diagram, evaluation board PGA450-Q1 EVM main features, circuit diagram and PCB layout diagram.
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 ApplicationsFigure

1. PGA450-Q1 Functional Block DiagramThe

digital data path has the following components:

• Band-pass filter

• Rectifier

• Peak extractor

• Downsampler

• Low-pass filterFigure

2. PGA450-Q1 Digital Data Path Block Diagram

Figure 3. PGA450-Q1 Application Circuit Diagram

Evaluation BoardPGA450-Q1 EVMThis

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

BoardPGA450-Q1 EVM Main Features:

• 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 boardFigure


4. Evaluation BoardPGA450-Q1 EVM Outline

Figure 5. Evaluation BoardPGA450-Q1 EVM circuit diagram: LIN

Figure 6. Evaluation board PGA450-Q1 EVM circuit diagram: power supply

Figure 7. Evaluation board PGA450-Q1 EVM circuit diagram: RS232

Figure 8. Evaluation board PGA450-Q1 EVM circuit diagram: USB controller

Figure 9. Evaluation board PGA450-Q1 EVM circuit diagram: PGA450-Q1

Figure 10. Evaluation board PGA450-Q1 EVM PCB layout diagram: top layer

Figure 11. Evaluation board PGA450-Q1 EVM PCB layout diagram: bottom layer
For details, please see:
http://www.ti.com/lit/ds/symlink/pga450-q1.pdf
and
http://www.ti.com/lit/ug/sldu007/sldu007.pdf