Current sensor datasheet ACS 715

[sandy]

Hi, The datasheet for ACS 715 current sensor from allegro, shows a vout   from 1.5V to 4.3V for input current of  5A to 20A (page7 of datasheet). If we  want to measure from 0A-20A , then is it possible to measure below 5A? . It is stated in datasheet that it can measure from 0-20A , them why  the spec , can someone help me with this. Rgds

[nctnico]

The swing of the output amp is limited. If you need to measure from 0 then you need a bipolar device.

[dannyf]

is it possible to measure below 5A? .

Sure. Though measuring very low current (ma for example) is likely difficult.

It is stated in datasheet that it can measure from 0-20A , them why  the spec

Likely due to reduced accuracy. Same thing with other high side sensors (different beast).

[Asim]

If you check page 9 you will find the full scale graph.
The graph in page 7 is probably showing the linear region? ( this is what it looks like for me )

[mij59]

The sensor is kind a noisy, take a look at page 10 of the data sheet.