TPS3850-Q1: /RESER and /WD tie together

Shinji Tsuji

Part Number: TPS3850-Q1
Other Parts Discussed in Thread: TPS3813-Q1,

Hi team,

I would like to tie /RESET and /WD together to make MCU in reset state when either OV/UV or Watchdog time out error occurs.

Is there any concern using these functions tie together?

If this is possible, pull up resister values should be same as I use these pins separately, since /WD is in high impedance while /RESET is low, correct?

regards,

over 5 years ago

0 Abhinav.Sharma over 5 years ago

TI__Genius 9375 points

Hi Shinji,

Have you looked at a device such as the TPS3813-Q1 that combines these functions into a single RESET output?

Thanks,
Abhinav.

0 Shinji Tsuji over 5 years ago in reply to Abhinav.Sharma

TI__Genius 14139 points

Hi Abhinav,

Thank you. I will look into this.

But what about the operation of the TPS3850-Q1?

Is it possible to use TPS3850-Q1 in this use case?

regards,

0 Abhinav.Sharma over 5 years ago in reply to Shinji Tsuji

TI__Genius 9375 points

Hi Shinji,

I believe by tying two equivalent pullup resistors here, it should still operate as intended. This use case, however, is not guaranteed in the datasheet. It must be tested.

Thanks,
Abhinav.

0 Shinji Tsuji over 5 years ago in reply to Abhinav.Sharma

TI__Genius 14139 points

Hi Abhinav,

Since /WD is in high impedance when /RESET is pulled Low, I think pull up resistor only requires 1, correct?

regards,

0 Abhinav.Sharma over 5 years ago in reply to Shinji Tsuji

TI__Genius 9375 points

Shinji,

Yes, sorry, I meant two rails to one pullup resistor.

Thanks,
Abhinav.

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TPS3850-Q1: /RESER and /WD tie together