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HDC3022-Q1: Assertion of RESET pin to disable device

Marco Nunez
Prodigy 40 points
Part Number: HDC3022-Q1
Other Parts Discussed in Thread: HDC3022

Tool/software:

Hi,

I'm trying to disable the HDC3022-Q1 while we perform some board testing as we need the ALERT pin to remain low (I see in the datasheet that this is high upon power reset). We are still working on our I2C drivers to properly configure the device but I saw this in the datasheet section 7.5.7.4 p24:

The ALERT output goes low when the HDC302x-Q1 has been disabled using the assertion of the RESET pin.

Does this mean that I am able to maintain the RESET pin in logic low to disable the HDC3022-Q1 for a prolonged period without causing any issues? In this scenario, we would keep the RESET pin low until we get our drivers in order.

Any help is appreciated!

Thank you,

Marco

  • 0
    TI__Genius 12215 points

    Hi Marco,

    I cant say for sure if holding the nRESET low will continuously force the ALERT to assert low, we have not tried that. The HDC3022-Q1 will boot up in a shutdown state (sometimes called a sleep state), where no temp/humidity measurements or other operations are occurring. While holding the nRESET low would accomplish what you want, I don't think that is necessary. What are you trying to prevent by keeping the nRESET low vs just having the HDC3022 in shutdown mode?

    Thanks

    -Alex Thompson

  • 0 in reply to Alex Thompson
    Prodigy 40 points

    Hi Alex,

    Thanks for the quick response. All we really want is to keep the ALERT signal low, but I'm seeing it be high right after boot, which is mentioned on the datasheet as normal behavior. There is also mention that the ALERT will go high on a reset event, so I'm not sure that pulsing RESET will make the ALERT to assert low. Is there a way to ensure the ALERT pin is low without having to issue an I2C command?

    Marco

  • 0 in reply to Marco Nunez
    TI__Genius 12215 points

    Marco,

    I don't think pulsing the reset would be the right choice for the reason you identified, it would just make the ALERT pulse. I do think holding the reset pin low would work for you in this case since the ALERT is high on power on, the datasheet does say the ALERT will go low when the RESET pin is forced low. I have just never tried it but it should work. I also cant imagine that would damage the part in anyway so it should be safe to try.

    Regards

    -Alex Thompson