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Original question:

PGA450-Q1: PGA450-Q1EVM-S

PGA450-Q1: PGA450-Q1EVM-S UART Communication

Matteo Sperandio1
Prodigy 90 points
Part Number: PGA450-Q1
Other Parts Discussed in Thread: PGA460

We are trying to communicate with the PGA450-Q1EVM-S using UART. Following the instructions on SLDU019B. We are sending the Test UART command: 0x00, 0x55, 0x01, 0x00 command0 at a baud rate of 19200. We also tried different baud rates. No response from the PGA450. 

Am I missing something?

  • 0
    TI__Genius 11015 points

    Hello Matteo,

    Our Application Engineering Expert working on PGA450 device is on vacation now and will respond to your query by the 21st October.

  • 0
    TI__Mastermind 27940 points

    Hi Matteo,

    A few items to verify:

    1. What microcontroller are you using? Is it a 3.3V or 5V logic level micro? The PGA450-Q1 is 5V only.
    2. What voltage are you supplying the PGA450-Q1? A minimum of 7V is required, so a USB based 5V supply will not suffice.
    3. 19.2kBaud is correct; no other baud rates will work on the pre-programmed EVM-S. Ensure you are using a UART configuration of: 8 data bits, 1 stop bit, no parity bit, LSB first, and non inverted (idle high).

    Please refer to the following E2E post for a similar discussion and additional instructions: https://e2e.ti.com/support/sensors/f/1023/t/839187

    Have you also considered using the PGA460PSM-EVM? This is our latest small form factor ultrasonic sensing module that does not require any programming whatsoever. You can use the example microcontroller code from the PGA460 software resources to customize the PGA460 operation. The PGA460 has a lower cost, smaller package, and offers better performance than the PGA450.

  • 0 in reply to Akeem Whitehead
    Prodigy 90 points

    Hi AKeem,

    we have solved. We have changed module and everything works.

    Kind regards,

    Matteo