RE: Power IC instead of MC33394

Just to second what David says really. We use individual regulators, switched mode to get down to 5V (LM2595) then LDO (LM1117) to 2V6 and 3V3 if necessary. It all works really well, the reset device is a SOT23 DS1818.

Pete

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of David Brown
Sent: 10 August 2005 13:12
To: [email protected]
Subject: Re: [MPC500] Power IC instead of MC33394


The power supply devices were pretty standard devices we use on many cards - I think the 5V switcher is an LM2673, and the LDOs are LM1117 adjustable regulators.  The reset device is a LM3724IM5-2.32, which I think is National Semiconductor.  Of course, you'll have to figure out the passive components around the supplies, depending on your source supply and your power requirements.  I don't think the exact components actually matter much - it's just a matter of dimensioning them properly according to your board's needs - extra ripple on the supplies would not go down well with the MPC. And if you need sleep modes on your card, things are going to be more complicated.

mvh.,

David



> Can you please tell us used chips for 5V switched mode chip, LDO's and 
> POR reset chip, since you have great results with them? Best regards,
> Blagoj
>
>
> Na 09.08.2005 11:44 David Brown rece:
>
> >>Is there a IC instead of MC33394 from Freescale?
> >>
> >>
> >>
> >
> >The simple answer is no.  There may be a slightly more complex answer 
> >if
you
> >already have a design built using the MC33394 - contact your 
> >Freescale distributer for information.  If you are in the position to 
> >need the
complex
> >answer, your distributer should probably already have contacted you.
Sorry
> >for the cryptic answer here - it's just I don't know how much 
> >information about this is NDA.
> >
> >By far the most sensible and practical solution is to forget the 
> >MC33394 ever existed, and build your own replacement.  The main 
> >features  of the MC33394 that you need to replicate are:
> >
> >The CAN driver - use a standard 82c250, or similar.
> >
> >The reset circuit - use a Dallas/Maxim 3-pin reset device on POReset, 
> >and tie HReset and SReset to 5V through a resistor.  The MPC5xx have
perfectly
> >good reset circuitry built-in.
> >
> >
> >
> >
> >
> >
> >
>
>
>
> -----------------------------------------------------------
> To learn more about Freescale Microcontrollers, please visit 
> http://www.freescale.com/mcu
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>





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