ACS712 max voltage question

Other Hardware General Electronics
1

I have an ASC712 ( Mftr. Part No. ACS712ELCTR-05B-T ) and am not certain about the spec sheet.

My input supply that I want to monitor, is 14Vdc, and can't be more than about 3A (as I only have a 3A power supply ).

I see the ACS712 will handle up to 5A.

But I can't determine, from the spec sheet, if I can put 14V through this - just don't know what I should be looking for.

Also, the spec sheet says "Output Voltage = 8V" ( absolute max ).
The "Supply Voltage" is also absolute max. 8V

Not wanting to fry my Arduino input pin with 8V, is it safe to assume that if I only power the ACS712 on pin 8 (Vcc) with 5V from the Arduino, then the max it can feed back on pin 7 ( VIout ) is also 5V ?

2

The isolation is between 184 and 2100 volts depending on what figure you look at. So 14 volts should be OK :slight_smile:

if I only power the ACS712 on pin 8 (Vcc) with 5V from the Arduino, then the max it can feed back on pin 7 ( VIout ) is also 5V ?

Correct.

Rob

3

The current path is physically isolated from the sensor chip (which is a hall-sensor). These particular sensors detect the strength of magnetic field produced by the current flowing through a copper strip. I suspect the 184V figure is likely to be the insulation provided by the packaging in free air (corona-discharge or flash-over limit) in the worst-case of humidity/temperature. The 2000V limit is likely assuming the device is potted in silicone sealant (or equiv) and represents the internal insulation break-down limit.