Hi Folks,
I am using an ACS714 to measure current from a battery charger. The spec sheet: (http://www.hobbytronics.co.uk/datasheets/ACS714.pdf)
It has a zero current Vout of 2.5V (VCC / 2). As my netduino has a max of 3.3 on the ADC, I am using a simple voltage divider (2 x 1k) to half the output.
Having a look at the spec sheet, Page 4, line for Output Resistive Load
Output Resistive Load RLOAD VIOUT to GND (min) 4.7kΩ (Sorry, formatting is grim)
Does this min that you cannot have a load of less than 4.7k? If so, this means my divider of 2 1k resistors is contributing towards the weird readings I am getting.
Would a divider of 2 10k be better? (any negative effect on that?)
Thanks
Crispin
I am using an ACS714 to measure current from a battery charger. The spec sheet: (http://www.hobbytronics.co.uk/datasheets/ACS714.pdf)
It has a zero current Vout of 2.5V (VCC / 2). As my netduino has a max of 3.3 on the ADC, I am using a simple voltage divider (2 x 1k) to half the output.
Having a look at the spec sheet, Page 4, line for Output Resistive Load
Output Resistive Load RLOAD VIOUT to GND (min) 4.7kΩ (Sorry, formatting is grim)
Does this min that you cannot have a load of less than 4.7k? If so, this means my divider of 2 1k resistors is contributing towards the weird readings I am getting.
Would a divider of 2 10k be better? (any negative effect on that?)
Thanks
Crispin