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Current Sensing/Measuring

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tronman

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I am having a problem measuring current. I have a circuit that needs a feedback which is the current through one of its lines. This current is powered by a 12V battery which oscillates a lot and it varies from ~3.50 Amps to ~1.75Amps. I wanted to set a shunt in series (30 mOhms) and measure the voltage across that through an A/D (8 bits input) but It doesn't work properly. The micro can't capture the voltage difference very well.

The next idea was to use a analog circuit to easure it acrros teh shunt. Since I only need to know two stages of the current?

Does anyone know any design for that or have any idea?

Thanks in Advance.

TronMan
 

Try

INA270AIDR

Code: 
http://focus.ti.com/lit/ds/symlink/ina270.pdf

or
ZXCT1021E5TA

Code: 
http://www.zetex.com/3.0/pdf/ZXCT1021.pdf
 

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