Tip / Sign in to post questions, reply, level up, and achieve exciting badges. Know more

Legacy microcontrollers Forum Discussions

Tao_2199
Level 3
Level 3
10 questions asked 25 sign-ins First solution authored

Hello,

According to FM3(CY9BF116TBGL-GE1) datasheet on page 70, the transient fluctuation rate for power supply voltage is described following.

“the transient fluctuation rate does not exceed 0.1 V/us when there is a momentary fluctuation on switching the power supply.”

In this case, if it can’t keep this rate, how will the device be affected?

When power supply voltage is switched to 5.5V from 3V with exceed 0.1 V/us,

for example, does I/O port not work correctly(output by mistake.)?.

 

Regards,

Tao_2199

0 Likes
1 Solution
TakashiM_61
Moderator
Moderator
Moderator
1000 replies posted 500 solutions authored 750 replies posted

Hello,

Your statement described in question is for "Stabilizing power supply voltage" (like for noise).

TakashiM_61_0-1650456932445.png

As the datasheet mentioned, a malfunction may occurs in this case.

It is hard to specify its device behavior, and it is not guarantee. 

 

And, when power supply voltage is switched to 5.5V from 3V with exceed 0.1 V/us, there is a possibility that   I/O port does not work correctly.

 

View solution in original post

0 Likes
1 Reply
TakashiM_61
Moderator
Moderator
Moderator
1000 replies posted 500 solutions authored 750 replies posted

Hello,

Your statement described in question is for "Stabilizing power supply voltage" (like for noise).

TakashiM_61_0-1650456932445.png

As the datasheet mentioned, a malfunction may occurs in this case.

It is hard to specify its device behavior, and it is not guarantee. 

 

And, when power supply voltage is switched to 5.5V from 3V with exceed 0.1 V/us, there is a possibility that   I/O port does not work correctly.

 

0 Likes