Texas Instruments PGA460-Q1 Manual
Texas Instruments PGA460-Q1 Manual

Texas Instruments PGA460-Q1 Manual

Automotive ultrasonic sensing module reference design for park assist
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TI Designs: TIDA-01597
Automotive Ultrasonic Sensing Module Reference Design
for Park Assist
Description
This reference design provides hardware architecture
for a Park Assist System (PAS) using three highly-
integrated, system-on-chip (SoC) ultrasonic transducer
drivers. These ultrasonic transducer drivers have an
integrated signal conditioner with an advanced digital
signal processor (DSP) core. Using these integrated
features, object detection from 25 cm to 2.5 m is
achieved. The distance data is sent over a one-wire
interface (OWI) to a local electronics control unit
(ECU) where the data can be aggregated and
processed. The sensor initialization, object detection
algorithm, and software described in this design guide
provide a basic framework to help engineers working
on PAS for automotive or collision avoidance.
Resources
TIDA-01597
Design Folder
PGA460-Q1
Product Folder
ASK Our E2E Experts
TIDA-01597
Transformer
MA58M
PGA460-Q1
F14-7N
TIDA-01597
Transformer
MA58M
PGA460-Q1
F14-7N
TIDA-01597
Transformer
MA58M
PGA460-Q1
F14-7N
An IMPORTANT NOTICE at the end of this TI reference design addresses authorized use, intellectual property matters and other
important disclaimers and information.
TIDUDO4 – May 2018
Submit Documentation Feedback
Local ECU/Main ECU
TX
IO
MSP430F5529
SN65HVDA100-Q1
Launchpad
RX
OWI Transceiver
CC2640F128
12 V Load Dump Protected
GND
Automotive Ultrasonic Sensing Module Reference Design for Park Assist
Copyright © 2018, Texas Instruments Incorporated
Features
Combines Three PGA460-Q1 Devices to Detect
Objects From 25 cm to 2.5 m
Provides System Diagnostic Information
Circuitry for Level USART and TCI Interface Option
Included
22-mm Diameter Solution Size
Applications
Ultrasonic Park Assist
Collision Avoidance
1

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Summary of Contents for Texas Instruments PGA460-Q1

  • Page 1 Automotive Ultrasonic Sensing Module Reference Design for Park Assist Description Features • Combines Three PGA460-Q1 Devices to Detect This reference design provides hardware architecture Objects From 25 cm to 2.5 m for a Park Assist System (PAS) using three highly- integrated, system-on-chip (SoC) ultrasonic transducer •...
  • Page 2: System Description

    Being an automotive application, it is also important to have a solution which can provide sensor diagnostic information. The solution should also detect and report failures of individual sensors for passenger safety. Here, the PGA460-Q1 device can provide sensor, supply, and transceiver diagnostics. System Overview...
  • Page 3: Design Considerations

    Boundaries of various zones are represented with different colors with the intent to generate appropriate alerts for the driver. TIDUDO4 – May 2018 Automotive Ultrasonic Sensing Module Reference Design for Park Assist Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated...
  • Page 4 PAS. The PGA460-Q1 device can receive and condition the reflected echo signal for reliable object detection. This feature is accomplished using an AFE consisting of a low-noise amplifier followed by a programmable time-varying gain stage feeding into an ADC.
  • Page 5 The PGA460-Q1 EVM GUI was used to optimize the device parameters. There are two threshold sets – Preset 1 (P1) and Preset 2 (P2). P1 is optimized to detect objects in the range of 20 cm to 50 cm with less number of pulses, lower current and shorter record time.
  • Page 6 System Design Theory www.ti.com Figure 4. Iso Pole Range Automotive Ultrasonic Sensing Module Reference Design for Park Assist TIDUDO4 – May 2018 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated...
  • Page 7 System Design Theory www.ti.com Figure 5 shows a screen shot of the general device settings. Figure 5. General Device Settings TIDUDO4 – May 2018 Automotive Ultrasonic Sensing Module Reference Design for Park Assist Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated...
  • Page 8 System Design Theory www.ti.com Figure 6 shows the time-varying gain settings. Figure 6. Time-Varying Gain Settings Automotive Ultrasonic Sensing Module Reference Design for Park Assist TIDUDO4 – May 2018 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated...
  • Page 9 Figure 7 Figure 8 show Preset 1 and Preset 2 threshold settings. Figure 7. Preset 1 Threshold Settings TIDUDO4 – May 2018 Automotive Ultrasonic Sensing Module Reference Design for Park Assist Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated...
  • Page 10 20 cm from the sensor. Figure 9. Data Monitor Automotive Ultrasonic Sensing Module Reference Design for Park Assist TIDUDO4 – May 2018 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated...
  • Page 11 MCU to execute various functions using the IO Pin. This interface does not use any addressing. Hence, it is not possible to connect multiple PGA460-Q1 devices on a single TCI bus in most PAS systems, where information from the individual sensor is separated. Because this interface utilizes the PGA460-Q1 IO pin and communicates using high voltage (the same as VPWR of the PGA460-Q1 device), it cannot be connected directly to a 3.3-V or 5-V MCU.
  • Page 12 SN65HVDA100-Q1 TIDA-01597 OWI Transceiver Transformer MA58M PGA460-Q1 12 V Load Dump Protected F14-7N Figure 11. TCI System Architecture Automotive Ultrasonic Sensing Module Reference Design for Park Assist TIDUDO4 – May 2018 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated...
  • Page 13 System Design Theory www.ti.com The PGA460-Q1 device is factory programmed with TCI enabled on the IO pin. For details on how to change the interface from TCI to OWI, see the in-system IO-pin interface selection section of the PGA460- Q1 Automotive Ultrasonic Signal Processor and Transducer Driver Data Sheet.
  • Page 14: Required Hardware And Software

    IO pin to one-wire USART. (Use an unique address for S1, S2, and S3; for example 001, 010, and 011, respectively) 4. Optional step – EEPROM registers of the PGA460-Q1 device can be programmed using CMOS- USART (which is faster) or programmed later in the system through one-wire USART.
  • Page 15 1. Power on the device. By factory default, the device is ready for UART and IO-TCI mode. 2. To toggle from TCI to OWU mode, send the in-system IO pin toggle pattern as described in the in- system IO-pin interface selection section of the PGA460-Q1 Automotive Ultrasonic Signal Processor and Transducer Driver Data Sheet.
  • Page 16: Test Setup

    Test Results Figure 16 Figure 17 show the output over UART and OWUI, respectively. Figure 16. Output Over UART Automotive Ultrasonic Sensing Module Reference Design for Park Assist TIDUDO4 – May 2018 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated...
  • Page 17 Hardware, Software, Testing, and Test Results www.ti.com Figure 17. Output Over OWUI TIDUDO4 – May 2018 Automotive Ultrasonic Sensing Module Reference Design for Park Assist Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated...
  • Page 18 Software Files To download the software files, see the design files at TIDA-01597. Related Documentation PGA460-Q1 Automotive Ultrasonic Signal Processor and Transducer Driver Data Sheet Trademarks All trademarks are the property of their respective owners. Automotive Ultrasonic Sensing Module Reference Design for Park Assist TIDUDO4 –...
  • Page 19 IMPORTANT NOTICE FOR TI DESIGN INFORMATION AND RESOURCES Texas Instruments Incorporated (‘TI”) technical, application or other design advice, services or information, including, but not limited to, reference designs and materials relating to evaluation modules, (collectively, “TI Resources”) are intended to assist designers who are developing applications that incorporate TI products;...

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