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TPS65381A-Q1: TPS65381A-Q1CAN Wake Up

Part Number: TPS65381A-Q1
Other Parts Discussed in Thread: TCAN4550-Q1

Masters,

We are promoting TPS65381A-Q1 to replace NXP FS6500/FS6400. And customer has some requirements for the wake up function. Since FS6500 has CAN interface wake up and multiple GPIOs wake up, and TPS65381A also have a CAN wake up PIN, but from the datasheet, I can see that the CAN_WU pin is only a voltage sensitive pin and have no difference with general GPIO wake up function, how can we realize CAN interface wake up? Another question is, the customer requires 3 GPIOs for wake up the PMIC, but TPS65381A-Q1 only have one wake up GPIO, do we have some recommendations to realize multiple GPIO wake up? Adding OR Gate is a choice, but the current will be a problem.

Do we have more powerful SBC to replace FS6500/6400?

Thanks and looking forward to your feedback.

Best Regard

Eric Fu 

  • Hello Eric,
    The TPS65381A-Q1 provides a CAN-wake-up, but requires an external CAN-physical-interface (Transceiver) like TCAN104x, TCAN105x, see also Figure 6-9 in datasheet. We do offer TCAN4550-Q1, which integrates a CAN-Trasnceiver with a CAN-Controller, but does not offer a power-supply (except an LDO to supply itself). Regarding the multiple wake-up option: for what functions/signals does the customer intend to use those? I don't see another option than wired OR, but would like to understand the need for it (or if it is just about matching what the FS6500 offers?).
    Best regards,
    Frank
  • Hi Eric,

    There are 2 wake up pins on the device, CANWU and IGN. Normally CANWU will be used connected to the 14 pin CAN transceiver as outlined by Frank where the INH output from the CAN transceiver is one possible wake up source. The IGN pin is another option connected to the "ignition" line. Neither of these wake up pins must be used for a specific source. They are both level sensitive, however the deglitch time is a little different on them, the IGN has a longer deglitch to avoid false wake ups from the noisier ignition line. Also the CANWU is a latched event, the device will remain on even if the level on CANWU returns low, where as the IGN is not latched by default, but there is an optional power latch on it via SPI register. If the wake up sources are open drain it may be possible to connect more than one source to one of the wake up pins.

    Best Regards,
    Scott