AnsweredAssumed Answered

Noise on GPIO input pin

Question asked by yafis.mohamed on Apr 25, 2016
Latest reply on Jun 5, 2016 by pierre
Hi.
I am using STM32F030 for my product.
The GPIOs are configured as input and are connected to touch ICs. Sometimes on some boards i observe noise on the input pins. I connected the pin to scope and i see the line continuously fluctuating. My knowledge to hardware is limited. I have no idea why it behaves this way. My hardware engineer is not able explain the behavior. I have 12 GPIO inputs connected to such ICs but only one or two behaves like this. That too not on all the boards.
My GPIO init is
GPIO_InitStruct.Pin = GPIO_PIN_13;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
plz help..!!
Thanks!!

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