About requirements of PCA9555's VDD rise up time.

cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 

About requirements of PCA9555's VDD rise up time.

204 Views
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,

Tags (1)
0 Kudos
2 Replies

192 Views
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,

0 Kudos

195 Views
TomasVaverka
NXP TechSupport
NXP TechSupport

Hello Yusuke,

Please refer to the following description in the datasheet.

Capture.JPG

Best regards,

Tomas

0 Kudos