I'm working on powering 4 servo motors with a dsPIC processor and I'm supposed to use the ADuM2400 series by Analog Devices to isolate the controller from the servo driver circuit.
Here's the datasheet for the ADuM2400 that I'm using http://www.analog.com/en/interface/digital-isolators/adum2400/products/product.html
. Now, the PIC works on 3.3volts and my servo control circuit on 5 volts, so I'm basically operating the ADuM under the 3/5 mode as specified in the datasheet.
But in the ratings specified by the datasheet (on page number 7), the maximum "Input Supply Current per channel (Quiescent) = 053 mA".
I'm not sure what this term exactly means. Does this mean that I have to have some kind of a resistor between the input channel pin of the ADuM and the microcontroller pin, with a value such that the sourcing current of the controller falls below this margin (0.53 mA)? Or can I simply connect the Controller's pin to the input channel?
Can someone please help me decipher this?