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AIROC™ Wi-Fi and Wi-Fi Bluetooth Combos Forum Discussions

cedric_roomz
Level 4
25 replies posted 10 questions asked 25 sign-ins
Level 4

Hi,

We made a custom board based on the CYW43907 dev kit design using 1GC modules. On one of our prototypes there is a ~80usec high glitch on GPIO_12 which happens right after Hib wake is toggled.

The glitch happens almost instantaneously after the hib_wake toggle, and a few hundreds of millisecond before the firmware is actually running. 

cedric_roomz_1-1658920735708.png

 

I am not able to reproduce this on other boards, though they have the same firmware and same hardware.

 

The pin is clearly driven high during those ~80usec, and then high impedance  (we have a 100K pull down on the line)

 

cedric_roomz_0-1658920264063.png

 

I am not able to reproduce this on other boards, though they have the same firmware and same hardware.

When the device powers up without HIB_WAKE, I don't see the glitch.

 

What could cause such a glitch?

 

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MuraliR_36
Moderator
Moderator 250 sign-ins 250 replies posted 100 solutions authored
Moderator

I am not able to reproduce this on other boards, though they have the same firmware and same hardware.

--> Are these your custom boards or the standard eval boards?

Is it possible to share the schematic of your custom board here?

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cedric_roomz
Level 4
25 replies posted 10 questions asked 25 sign-ins
Level 4

It's a custom board, but strongly based on the eval board.

I won't be able to share the whole board here. But I can share some specific parts. Tell me what is needed for such an issue.

 

GPIO 12 is connected to the gate of a transistor with a pull down.

cedric_roomz_0-1658930012303.png

 

 

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