• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 32 subscribers
  • Views 140 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TLIN1431-Q1: TLIN14315RGYRQ1

Lynn Song
Prodigy 70 points
Part Number: TLIN1431-Q1

we'll design SBC TLIN14315RGYRQ1 to a pin control mode. i have question as below:

1.  is nWDR an open drain output for pin mode configuration?

2. in general, we will connect NRST to reset microcontroller during UV and power on. does the below mean that we can directly connect nWDR and NRST together to the reset pin of micro?

3. Upon the pin mode configuration, if a watchdog fault occurs, what nRST behave? no effect, go to low at the same time as nWDR too?

  • +1
    TI__Mastermind 25385 points

    Hi Lynn,

    Thanks for reaching out!

    The nWDR pin is an output that can connect to the MCU's reset input. The nWDR is pulled low due to watchdog failures, which happen in application due to any sort of theoretical lock-up, hang, fault, or loop in the MCU that prevents it from operating correctly. A pulse to the MCU's nRST pin from the TLIN1431-Q1 nWDR output can solve this issue.

    The nRST pin will be low whenever the nWDR pin is low, so you do not need to connect them together. The difference is that the nRST pin will also be low during other events, including undervoltage events or in restart mode. The tradeoff is that the MCU might be held in reset when not desired. If your design desires this, then it could be acceptable, but you would not be able to distinguish watchdog resets from undervoltage resets, for example.

    Best,

    Danny

  • +1 in reply to Danny Bacic
    Prodigy 70 points

    Thanks a lot, Danny!

    the faults such as overvoltage and overtemperature will shut down VCC, so it doesn't matter to remain reset. we need it keep reset for undervoltage. so to use nRST as reset signal is our best option. it's not necessary, but possible we can read nWDR to diagnose miscellaneous or fatal failure out of SBC control. for exsample, nWDR = low, but VCC still available and micro is still running to get nWDR = low.