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AWRL1432: How to control the sub module status during LPDS

Andy Yin
Expert 8670 points
Part Number: AWRL1432

Hi,

Question about LPDS, once enter LPDS, how about the module such as LIN, UART, CAN-FD status? can the peripherals still work?

In current motion detection and KTO demo, I don't see such configuration on the peripherals status once in LPDS.

My customer would like to keep LIN still work during LPDS, how to implement that?

Andy

  • 0
    TI__Expert 8782 points

    Hi Andy,

    those peripherals all will get shut down in LPDS, we do have the option to wakeup out of LPDS from an interrupt from LIN or similar as shown below.

    Regards,

    Tim

  • 0 in reply to Tim Henderson
    TI__Expert 8670 points

    Hi Tim,

    A u mentioned and checked in the TRM, the wakeup source doesn't include LIN, how to use LIN as wakeup source? can u help provide one example?

    Is it able to enable LIN in LPDS mode through putting the LIN TX/RX pin in NOT PARK STATE?

    My customer want to keep LIN TX/RX work in LPDS, would u pls help double check?

    thanks

    Andy

  • 0 in reply to Andy Yin
    TI__Expert 8782 points

    Hi Andy,

    Sorry I made a mistake. We cannot wakeup from LPDS using LIN or CAN. Theoretically it is possible through some pinmuxing to wakeup through the CS bit in SPI (since the SPI CS and LIN RX can share the same pin), but this would be a little complicated.

    LIN can wakeup from sleep mode (not LPDS) just fine and this is supported. One of our LIN examples in the SDK shows this.

    The customer could also define their own sleep function (see idle3 in the demos) where everything is turned off except for LIN. The power numbers here are unknown and would certainly be higher than LPDS, but it would achieve the same effect.

    Regards,

    Tim