UCD9090A: CNTRL signal

Oba

Genius 15800 points

Part Number: UCD9090A

Hello,

I want to start sequencer by CNTRL signal.

Is there any way to start sequencer by falling edge of CNTRL signal?

The signal is Low-High-Low. I want to start the sequencer at this High-to-Low edge like the below figure.

Regards,

Oba

over 6 years ago

0 yihe over 6 years ago

TI__Guru 58100 points

Yes, the polariy of CTRL signal is configurable.

Pelase refer http://www.ti.com/lit/ug/slvub51/slvub51.pdf at figure 4-29.

Regards

Yihe

0 Oba over 6 years ago in reply to yihe

TI__Genius 15800 points

Hello Yihe,

I know the polarity can be changed.
But as far as I teseted, it is level detection.
It menas it start from Low(1).

Low(1) -- High -- Low(2)

I want to start at High-->Low(2) falling edge. I want to ignore Low(1) period.

Regards,
Oba

0 yihe over 6 years ago in reply to Oba

TI__Guru 58100 points

Hi Oba
the CTRL function is defined by the PMBus spec. we have to follow it.
But do you have other GPI signals that can be AND or OR to the CTRL signal?
Other than CTRL signal, UCD9090A also support PIN SELECTED RAIL STATE function, which can use up to three GPI signal to turn on or off rails?
This may be alternative solution.
Regards
Yihe

0 Oba over 6 years ago in reply to yihe

TI__Genius 15800 points

Hello Yihe,

Thanks. I didn't know PIN SELECTED RAIL STATE function.
I'm not still sure this function can be helpfule to realize what I want, but I will think of it.

Thank you.
Oba

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UCD9090A: CNTRL signal