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over power consumption with the DRV2605

thierry venet
Intellectual 465 points
Other Parts Discussed in Thread: DRV2605

Hello,

We have design a product with a DRV2605 and we have problem with the power consumption.

The fonctionality of the DRV2605 seems to work well (we have succeful LRA control), but the consumption is very high. We we just put the DRV2605 on (=we put the EN pin at high level), the current take +40mA ! (without any LRA command).

Thanks for any idea.

Thierry

  • 0
    TI__Genius 12485 points

    Thierry,

    Could you please share the schematic and some more details on what the DRV2605 is doing? When EN is high and even out of software shutdown 40mA is way too high. Also information on where you are measuring the 40mA will help.

    Regards,

    Gautham

    Applications Engineer- Haptics

  • 0 in reply to Gautham
    Intellectual 465 points

    Here is a piece of my schematic

    NC mean "Not connected"

    The DRV drive a LRA from Precision Microdrive (which is directly connected to the OUT_P and OUT_N pins)

    The EN and TRIG pins are drive by the I/O expander.

    Current measurement is made on PBUS_INT which is provided by a laboratory AC/DC power supply for test purpose (PBUS_INT = 4Vcc)

    thierry

  • 0 in reply to thierry venet
    Intellectual 465 points

    Here a better quality print of the schematic

  • 0 in reply to thierry venet
    TI__Genius 12485 points

    Thierry,

    Thanks for the schematic. I looked at it and couldn't find anything suspicious. However, I would suggest the following.

    1. Make the VREG cap. to 1uF only.

    2. Do you have a testpoint before the DRV to measure current consumption by it? Currently they are connected to PBUS_INT which is also the supply for the expander.

    3. Could you send a Reset command to see if there is any difference? Post Reset, you will have to take it out of SW shutdown to enable the part.

    Let us know.

    Regards,

    Gautham

    Applications Engineer- Haptics

  • 0 in reply to Gautham
    Intellectual 465 points

    Hello Gautham,

    We finaly find the problem : the over consumption don't come from the DRV but the I/O Expander. (So your second remark was the right way to investigate).

    Our first error was to think the I/O expander is a simple IC and don't provide this kind of problem. But it seems that these "Quasi bidirectionnal port" have something like 10mA consumption when there are not connected and put to 0 ! (it is the first time I use "quasi bidirectionnal I/O expander", true bidirectionnal I/O expander don't have theses issues).

    When we put the not connected port to 1, the consumption probleme disappear....

    Best regards,

    Thanks for answers...

    Thierry

  • 0 in reply to thierry venet
    TI__Genius 12485 points

    Thierry,

    Glad that the DRV was not a bottleneck. Keep this forum posted on your development!

    Regards,

    Gautham