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Original question:

CCS/BOOSTXL-PGA460: Using PGA-460 to calculate the distance from an object to the sensor

PGA460-Q1: Measuring up to 20 meters distance

Gabriel Onzi
Prodigy 130 points
Part Number: PGA460-Q1
Other Parts Discussed in Thread: PGA460

Hello,

I'm trying to use PGA460 to measure distances up to 20 meters. I've already been able to successfully use PGA in his maximus record range. I've already seen PGA's FAQ where it's said that I can issue an BAL command following an LO command.. But I can't do it right away.. I need to wait a few miliseconds before issues another command, specialy if I want to extract the Echo Data Dump results...

Thanks you,

Gabriel Onzi

  • 0
    TI__Mastermind 27950 points

    Hi Gabriel,

    To expand upon PGA460 FAQ #5.1 "How can I detect an object if it is further than 11m?" ( https://www.ti.com/lit/pdf/slaa733 ):

    You will not be able to collect the echo data dump for both 0-11m and 11-22m in a single burst-and-listen (BAL). If you need a complete 0-22m echo data dump profile, you will need to perform two separate BAL commands:

    • First, perform a typical BAL command to capture the 0-11m echo data dump. Read back the echo data dump data.
    • Second, perform a second BAL command, and as the record length nears 65ms, send a listen only (LO) command to capture the second half (11-22m) of the echo data dump. To avoid a blind spot in the 11~12m range, the LO command needs to be sent before the end of the second BAL command since the UART/SPI communication takes time for the master to fully transmit. The specific amount of time is dependent on the UART baud rate or SPI clock.