LPC MicrocontrollersのトピックRe: LPC54xxx GPIO is powered earlier than VDD

LPC54xxx GPIO is powered earlier than VDD

hiwave — Wed, 18 Mar 2020 06:39:59 GMT

Hi,

Customer is using LPC54016, one IO pin is used to monitor the power supply state, which will be powered 160us earlier than LPC54016 VDD, can this result MCU power up failure? or is it potential risk?

Does LPC54xxx have some limitations for power on?

Thanks!

Best Regards

Derek

Re: LPC54xxx GPIO is powered earlier than VDD

xiangjun_rong — Wed, 18 Mar 2020 08:40:10 GMT

Hi, Derek,

As you know that the digital pin has ESD protection circuit, if you can limit the current of the I/O pin to 2mA even if the VDD is not powered, it is okay. In other words, it is okay if you connect a serial resistor to limit the current to less than 2mA.

Hope it can help you

XiangJun Rong