1. I need to select bidrectional current sense to be used as ammeter.
2. Going through some of voltage output IC , to be operated at 3.3V.
3. Since it is ammeter it can high side or low sense or between two loads.
4. Only problem I have found that IC have miminum CMR, e.g 4V. So I need to have minimum voltage of source to measure current. E.g if I have 1V source & load is 100ohm, I won't be able to measure current through it.

5. Best I can found is LMP8601 from TI.

6. Any suggestions on that.

 

ina282 and family.

 

A Hall effect current sensor like this one https://www.sparkfun.com/products/8882 can provide up to several thousand volts isolation between the circuit in which the measured current is flowing and the sensor output.

Allegro Systems is one manufacturer of Hall effect current sensors.
http://www.allegromicro.com/en/Products/Current-Sensor-ICs.aspx

 

ZXCT1009 (unidirectional) and its bidirectional bretheren at Diodes, Inc