Mike Ingle wrote:
>
>
> Just a quick explanation of the attached circuit.
>
>
> R1 and R2 form a voltage divider which divides by 5.
> The current at 15V is 12uA.
> if the input exceeds 16.5V then you might damage your ep9302.
> The input to the ADC could rise as high as 3.7V befor D1 starts to
> conduct. However, with the current limited below 15uA I would expect
> things to be OK.
> You must also protect from negative inputs. D2 performs the same
> function starting at about -0.4V.
>
> I don't have the tech manual on the 9302 handy, so I am not sure what
> the input impedance of the 9302 is. Hopefully several mega-ohms. If
> it is less than that, then this circuit will not be very linear in its
> response.
> If you are going to be doing much instrumentation, it is a fun field.
> Get yourself a copy of: "The Art of Electronics".
>
> Regards,
> Mike
>
> On Feb 3, 2010, at 3:45 PM, Mike Ingle wrote:
>
>>
>>
>> you must ensure that the input to the ADC NEVER EVER exceeds 3.3V
>>
>> one way:
>>
>>
>>
>>
>>
>> On Feb 3, 2010, at 3:09 PM, Claudio Izzi wrote:
>>
>>> n the C code? or much more complicated?
>>
>
>
Thanks for all the replies, I just thought since in the product
description it mentions its ideal for "solar applications" I told myself
they are referring to a standard 12VDC deep cycle battery thus reading
its voltage in the ADC. I'll look for a ready made solution, maybe a
device I can attach via the USB or serial port that will give me the
reading from the source.
------------------------------------
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/ts-7000/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/ts-7000/join
(Yahoo! ID required)
<*> To change settings via email:
<*> To unsubscribe from this group, send an email to:
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
|