Re: [ts-7000] TS-7260 12V ADC question

[Mike Ingle <>]

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?

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