[linux-cirrus] Re: Guide me please
- From: Nabil shaukat <nabilshaukat@xxxxxxxxx>
- To: linux-cirrus@xxxxxxxxxxxxx
- Date: Sat, 29 Jan 2005 10:12:06 -0800 (PST)
Thanks Matteo ,
It means that you approximate other ICs (SDRAM
Flash and Ehternet) for only 700mA ? I think two SDRAM will take about 400mA
and Flashes about 100mA and ethernet transiever about 200mA and if u connect
IDE on it will take extra bit of current ?
Best Regards
Nabil Shaukat
r&d3-dave-tech <r&d3@xxxxxxxxxxxx> wrote:
Hi guys,
User manual declare for EP9315 a total power dissipation of 2W (1V8+3V3)
MAX value.
For 1V8 manual provides a typ. value for core current supply : 200mA.
I'd like to have a maximum value for current supply, by cirrus but
sfortunately ...
...Though I'm feel to assume that maximum value for core current supply is
about 400mA.
(absolute personal value but I hope it's pessimistic estimation )
So for 1,8x400 = 720mW (approximate).
So only 1,3W of total dissipation should be given by 3V3 I/O voltage.
Then for 3V3 we should have only 1.3 /3.3= (about ) 700mA .
What do you think?
Now I have an LM1117-1.8 (1A max) that generate 1.8V from 3.3V and an
LD1086 (1,5A) that provide the 3V3.
EP9315 with LAN, 3 serial, one USB port in function works fine and Current
in 3V3 is about 500 mA
Br,
Matteo
>9312 should only need 200mA on core, so 1.5A will more than do.
>
>3v3 more difficult to estimate, but 1A5 should be fine. What PHT
>are you using - they are thirsty, and if you've found one that
>runs off 3V3 you need to be careful
>
>
> > *Subject:* [linux-cirrus] Guide me please
> > *From:* Nabil shaukat
> > *To:* linux-cirrus@xxxxxxxxxxxxx
> > *Date:* Wed, 26 Jan 2005 09:33:06 -0800 (PST)
> >
> > Hi Dear ,
> >
> > I want to use LT1963 regulator which 1.5 A
>rating on 3.3V
> > and 1.8V in SMD Pakage SOT223 , Is it suitable for my EP9312
>Data
> > Aqusation card which contain 2 SDRAM 2 Flash Ethernel chip ,
>Compact
> > Flash card . Please guide me is this regulator is suitable for
>my
> > design? Or Please tell any SMD regulator which will work good
>for my
> > design.
> >
> > Best Regards
> >
> > Nabil Shaukat
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