ColdFire/68K Microcontrollers and ProcessorsのトピックVSTBY pin, when not used

VSTBY pin, when not used

efk — Thu, 25 Sep 2008 05:43:41 GMT

Hello,

I have a question regarding VSTBY pin of M5221x.
When we do not wish to use the standby power feature (i mean no battery on printed circuit board), i do not understand where to connect this pin.

Shall i connect it to 3,3V ?

Re: VSTBY pin, when not used

efk — Fri, 26 Sep 2008 15:07:22 GMT

After a Google research, i found this text in another PDF file (Freescale MPC5565 Microcontroller Data Sheet): "If standby operation is not required, VSTBY can be connected to ground"

So i think there is a good chance it is the same with the M5221x (?)

Message Edited by efk on 2008-09-26 09:07 AM

Re: VSTBY pin, when not used

efk — Mon, 29 Sep 2008 05:14:40 GMT

Could you please tell my if my above question is dummy, or do the M5221x users always include the battery for VSTBY in their production pcb ?

Re: VSTBY pin, when not used

efk — Mon, 29 Sep 2008 14:26:12 GMT

After more research, i found another Freescaler processor PDF file which says: "If standby operation is not required, connect VSTBY to ground". It is the MPC5554 data sheet.
I will do the same with the M5221x.