PCA8561 Exposed paddle

dflohr · ‎11-21-2018

On PCA 8561 LCD driver, in layout and confused regarding the exposed die paddle.

The data sheet says "[1] The die paddle (exposed pad) is connected to VSS and should be electrically isolated." OK

Page 44 Figure 32 shows the footprint. Here is the confusion.

9 Paste Pads. OK

Entire copper land = paddle size exposed. OK

4 round 6mm pads with a 3mm hole (?)

Can you explain? Would have assumed that the holes would plate through to ground plane however that goes against the note to electrically isolate.

Please assist.

Thank you.

guoweisun · ‎11-21-2018

Hi

I don't think it goes against the note to electrically isolate.

I think use this VIAs can enlarge this exposed GND for multi-layer,you can only isolate this multi-layer exposed GND from the system GND at you do PCB layout!