About requirements of PCA9555's VDD rise up time.

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About requirements of PCA9555's VDD rise up time.

201件の閲覧回数
try_try
Contributor I

Hello,

Could I ask you any questions?
Do you have requirments of PCA9555's VDD rise up time?
I could find description of VPOR in the PCA9555's datasheet, but couldn't find description of VDD rise up time.

Now I am goint to set up to make PDA9555 work.
When I sent davice address to PCA9555 from be connecting CPU, acknowledge couldn't be recived from PCA9555(NAK).
However I made VDD on and off, the above problem was solved.
Device address is 0x40.

I would like to know cause of this condition.

Best Regrads,

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189件の閲覧回数
try_try
Contributor I

Hello Tomas san,

Thank you for your reply.

The data sheet does not contain any specific regulations regarding the rise time of the power supply, but does that mean that there will be no problems in operation?

Best regards,

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192件の閲覧回数
TomasVaverka
NXP TechSupport
NXP TechSupport

Hello Yusuke,

Please refer to the following description in the datasheet.

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Best regards,

Tomas

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