PSWITCH left unconnected and DCDC issue

[dgotfroi]

Hello all,

I use a IMX28 with an external +5V power supply. I don't have any battery connected.

So, can I leave PSWITCH unconnected or do I have to tie it to GND or other ?

Second question, since I don't use a battery, do I need to connect something to "Battery", "DCDC_BATT" and "VDD4P2" ?

I followed the schematic of the evaluation board and my shematic looks like that :

But "VBAT" is leave unconnected, so can I remove C1 to C10, R1 to R4, D1 and L1 ?

Many thanks

[victorien · Accepted solution]

You can find the best way to supply your board on this document http://cache.freescale.com/files/32bit/doc/app_note/AN4199.pdf?fasp=1&WT_TYPE=Application%20Notes&WT... chapter 4

[dgotfroi]

Many thanks for this very useful answer.

And what about PSWITCH ?

[victorien]

If you need the recovery boot, you need to keep the same schematic as Evaluation Board. But if you don't use recovery and always supply to VDD5V, I thinks the best connection is to tie it to GND

[dgotfroi]

Many thanks for all. I had my answer :smileyhappy:.