LPC MicrocontrollersのトピックRe: LPC43xx LPC4333 LPC4337 USB0_VDDA3V3 not connected on PCB

LPC43xx LPC4333 LPC4337 USB0_VDDA3V3 not connected on PCB

jueboe — Mon, 25 Jan 2021 12:26:27 GMT

I have a PCB for LPC4333 still now without parts. I don't need the USB modules. On this PCB are the pins USB0_VDDA3V3 and USB0_VDDA3V3_DRIVER not connected to power 3.3V (floating). It is possible, that this PCB work without the connections on this pins?

Re: LPC43xx LPC4333 LPC4337 USB0_VDDA3V3 not connected on PCB

ZhangJennie — Mon, 25 Jan 2021 15:08:51 GMT

If they are unused, Please tie these two pins to VDD.

Hope this helps,

Jun Zhang

Re: LPC43xx LPC4333 LPC4337 USB0_VDDA3V3 not connected on PCB

jueboe — Mon, 25 Jan 2021 17:40:18 GMT

Thanks!

What will happen without the connections of the pins USB0_VDDA3V3 and USB0_VDDA3V3_DRIVER to VDD?

(I cannot connect the two pins on my PCB (LBGA with 256 pins). I can only let produce new PCBs.)

Re: LPC43xx LPC4333 LPC4337 USB0_VDDA3V3 not connected on PCB

ZhangJennie — Tue, 26 Jan 2021 03:37:51 GMT

Hi jueboe,

We suggest you defining unused pins as our recommendation.

There is no full report if you use it in another way. So I can't say what will happen as this is not our recommended way of using . If so, we can't guarantee chip work normal, working like this for long time may potentially reduce part life

Have a nice day,

Jun Zhang