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LP8764-Q1: Warm Reset Pre configured delay

Bala Mahadeva iyer
Prodigy 190 points
Part Number: LP8764-Q1

We are using LP876411B4RQKRQ1 device. The following are the questions

a) Do we have to define the state transitions for WatchDog Error or the wam reset specified in the datasheet is automatically executed ?

b) The data sheet mentions that the device will enter warm reset in two condition. a) Initial Long window expiry and b) WD_RST_INT. Will this disturb any power rails ? The warm RESET# is mentioned as asserting nRESETOUT and nRESETOUT_SOC for a pre-determined time window. Where is the pre determined time window defined? Is this in a user programmable register ?

  • 0
    TI__Expert 7060 points

    Hi Bala,

    1. Yes, you can define what warm reset or WD expiration does in the device. Usually it writes nRSTOUT low and writes default values to voltage setting registers and writes nRSTOUT back to high. Please see figure below as example.

    2. This is dependent how you define warm reset sequence. WD_ERROR can be triggered either by expired long window or too many watchdog errors. nRSTOUT or nRSTOUT_SOC duration can be defined in the sequence.

    Br, Jari