TPS3840-Q1: 2s dection and 8s delay

Hi Roy,

I believe you are looking for a voltage detector with adjustable delay on both the rising and falling edge, correct? We consider this SENSE delay and RESET delay. The TPS3840-Q1 does not have this feature, but a device such as the TLV840 does. Could you take a look and see if this is along the lines of the solution you desire?

If not, let me know, and we can probably configure one of our supervisors with a few external parts to figure it out.

Thanks,
Abhinav.

Hi Abhinav,

I think TLV840 isn't a appropriate solution. Let me use word description for you.

Set voltage input = 4.1V initially

when voltage input lower that our solution VIH(ex.0.5V) and time duration is larger than 2s and then IC output goes low after 10s delay.

when voltage input lower that our solution VIH(ex.0.5V) but time duration is smaller than 2s and then IC output remains high. 

If there is anything unclearly, please feel free to let me know.

Roy

Hi Team,

Any suggestion?

Roy

So essentially you are looking for adjustable glitch immunity (ignore pulses under 2s)?

Thanks,
Abhinav.

Hi Abhunav,

Yes. Do you have any suggestion?

Roy

Hi Roy,

This cannot be achieved with a one chip solution that I know of. The glitch immunity we offer is in the range of ~20us and at the lowest overdrive. To be able to ignore pulses less than 2s, you might have to implement timer logic or monitor the voltage as a WDI line on a watchdog, but I'm not sure how easily it can be implemented. Is the customer looking for a one IC solution to this problem?

Thanks,
Abhinav.

Hi Abhinav,

It could be implemented by two more IC solution. Do you have any idea or APP note which is related to this spec?

Regards,

Roy

Roy,

We don't have any app notes related to this specifically, and I think this may be better achieved using a timer device such as the TPL5010, and it may be worth floating the idea over to that forum. Let me know if you think I am missing something, as a simple solution with a supervisor in mind does not seem clear to me.

Thanks,
Abhinav.