I'd like to use a ACS712 with a precise 16bits ( I'll round the value to get 12bits ) with a 5v reference 0.2%. It's for datalogging then I use a battery with a dcdc 5v but it's not 5V, it's more 5.2v.
If I power supply the ACS712, it will give me 2.5V for 0A or the half of the Vcc (5.2V => 2.6V for 0A) ?
If yes, how we can make it accurate ?! Finding an accurate reference which allows a load. (even 10mA is still too much for a 0.2% reference)
I didn't find anything in the datasheet, just it's 2.5V for 0A if Vss=5V :/
Even if it's useless to get a 12bits accuracy, it's more useless and more unreliable to get a Vout at 0A dependent of the Vcc.
Is the sensitivity of 66mV/A is constant and independant of Vcc ? Then I'd just need to initialize the 0A value.