[En-Nut-Discussion] Ethernut 1.3 analog input

[Pedro Duarte]

Hi

The voltage at any pin of the microcontroller cannot be higher than the supply voltage.
But that is not a problem, just use a voltage divider at each analog input.
This will bring you voltage range down to the voltage range that the microcontroller can handle.
Also, special care must be taken if you batteries are in series and with galvanic isolation if needed...

Regards,
Duarte

-----Mensagem original-----
De: en-nut-discussion-bounces at egnite.de [mailto:en-nut-discussion-bounces at egnite.de] Em nome de Tiziano
Enviada: terça-feira, 1 de Setembro de 2009 10:01
Para: en-nut-discussion at egnite.de
Assunto: [En-Nut-Discussion] Ethernut 1.3 analog input

Hi All,
I'm planning to implement a project with ethernut1.3 to remotely monitor 
Pb batteries charge status.

I've read ethernut datasheet and wiki examples about analog inputs but i 
still have some questions:
* what V input range for analog inputs?
* AFAIK if i need to measure an input of 13.8v i need an AREF >=13.8v 
correct? so i must plan to generate a 14/15v reference with a dc-dc 
converter. Or there can be a smarter solution?

Thanks, Tiziano
-- 
BR,
	Tiziano D'Incà
CTO at ASDASD srl
ASDASD.it  -  POPWIFI.it            +39.0437.1835.100

-- 
BR
        Tiziano D'Inca'
CTO at ASDASD srl
ASDASD.it  -  POPWIFI.it  tiziano at asdasd.it  +39.0437.1835.100
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