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Is an external pull-up required on WAKEUP pin? | Cypress Semiconductor

Is an external pull-up required on WAKEUP pin?

Summary: 3 Replies, Latest post by Bob Marlowe on 26 Aug 2016 04:06 AM PDT
Verified Answers: 0
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Jaemann Park's picture
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11 posts

I want to use the Stop mode of CYBLE-012011-00 in my project.

I know that only the pins XRES and WAKEUP (P2[2] for CYBLE-012011-00) can be used to wakeup the device from stop mode.

The question is whether if an external pull-up resistor is required on the WAKEUP pin.

I do have an example project that seems to work with a switch attached to P2[2], P2[2] set as resistive pull up and the polarity of the wakeup pin set to active low, but I just want to check before I design my custom PCB.

Thank you.

Jaemann

user_1377889's picture
User
10439 posts

AN86233 tells, that all GPIO settings and states will be frozen. Thus would mean that the internal pullup and state = high will be maintained during stop mode. 

 

Bob

Jaemann Park's picture
User
11 posts

Thank you for the confirmation.

I have one more question.

I know that PSoC 4 and PRoC are different devices with different functionalities. But sometimes, I cannot seem to find the exact documentation for PRoC devices, e.g. System Reference Guides in PSoC Creator only point to documentation for PSoC 3/4/5LP devices. In these cases, can I resort to documentation for PSoC 4s?

I have just started to work with these devices and it is a little confusing yet.

Jaemann

user_1377889's picture
User
10439 posts

In Creator, Workspace Explorer window (left hand side) there is a tab named Datasheets. There you will find a link to your selected device datasheet.

 

Bob

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