• State TI Thinks Resolved
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 62 subscribers
  • Views 35 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

TPS3431: About functionality

Apurva Agre
Prodigy 40 points
Part Number: TPS3431
Other Parts Discussed in Thread: TPS3435,

Tool/software:

Hello,

In one of our projects, we are planning to use TPS3431SDRBR watchdog timer IC. we are having following queries related to TPS3431SDRBR,

1. In our design we want to use TPS3431SDRBR on 1.8V supply which may drop to 1.7V. As 1.8V is minimum supply voltage of TPS3431SDRBR, is it OK to use on 1.8V supply or it will affect the functionality? Or do you have other watchdogs which can safely operate on 1.8V?  

2.What is the difference between functionalities of SET1 and EN pin. Can you please elaborate on what circuitry need to be connected to these pins and operation?

3. What is the functionality of ENOUT pin? Will it be ok if we just connect pull up to this line, or some other oring circuitry is required?


Regards,

Apurva Agre.

  • 0
    TI__Genius 12890 points

    Hi Apurva,

    I would recommend using our TPS3435 instead, since the TPS3435 has a VDDmin of .9V.

    The main difference between SET1 and EN is ENOUT. Both inputs will disable the watchdog, but EN will also pull the ENOUT low. Both inputs are connect to a logic gate, most likely and AND gate, which will disable the watch if either or both inputs goes low.

    The ENOUT can be left floating if it is not needed.

    Jesse 

  • 0 in reply to Jesse Villanueva
    Prodigy 40 points

    Hello Jesse

    Thank you for the recommendation. If we continue to use the TPS3431 in our design (refer to the attached image) and if we provide a constant 1.8V supply to the TPS3431, will it work properly?

    Additionally, if the supply voltage falls below 1.8V, what will happen? Will the watchdog turn off, or will it affect functionality?

    Best regards