STM32L071KBUx UFQFPN32 exposed pad

kurt dewulf · ‎2018-03-15

Posted on March 15, 2018 at 12:13

I'm drawing a new design with the STM32L071KBUx #UFQFPN32.

Do I have to connect the exposed pad to the GND, or can I leave it open. I don't see any note in the datasheet DM00141136.pdf, so I think that I can leave it open ?

T J · ‎2018-03-15

Posted on March 15, 2018 at 23:58

connected to ground usually, can you use a meter to check it ?

the smaller QFN style chip has the rating like 36degrees raise in temp at 1W...

these stm32L parts are supposed to be low power,

at 32MHz I cant see then getting warm.

do you have one running ?, does it get hot ?

kurt dewulf · ‎2018-03-16

Posted on March 16, 2018 at 07:40

I don't have the device yet (proto phase).

T J · ‎2018-03-16

Posted on March 16, 2018 at 08:04

It’s not mentioned in the data sheet, so don’t connect it.

I would be surprised if the chip gets warm under load,

You would have to make that assessment when you have it running.

Otherwise on the PCB, just send a couple of via’s through and heat sink it.. a bit.