CC3200: GPIOs triggering due to DC noise in input

Pragadheesh Raj

Part Number: CC3200

I have been trying to develop an AC Switch with Triac and CC3200. I used a CC3200 launchpad for prototyping and all went fine.

But when I built a custom PCB to prototype I used a 3.3v switching power supply. If an inductive load appliance like Motor (eg. Fan) is turned on, there is lot of noise in the DC input ground level. This triggers my GPIOs for a very short time causing unwanted triggering in the circuit. Is there a solution to this ? How do I check if I am using a good power supply? Is ther something which I can do to reduce the input ground noise ?

over 8 years ago

0 Vincent Rodriguez over 8 years ago

TI__Mastermind 28285 points

Pragadheesh,

You need to make sure you have added proper capacitance to help filter any extra noise you are creating in your system.

You can do some measurements. Look at your VCC_BAT with reference to ground on the oscilloscope, and see if you see noise in the signal. You can look at the layout design guide, make sure you layed out your PCB with our recommendations in mind.

www.ti.com/.../swru370a.pdf

Let me know your findings!

VR