Hi Miguel,
Please let me ask you to clarify again.
When you talked as follows,
> Vdd is not powered but probably connected to a supply so.. two things may happen,
> 1- the supply is at high impedance, then the part is powered indirectly by the reference.
> 2-the supply is at low impedance, then the reference is probably short- circuited to gnd.
did you mean "high impedance" is equal to a state of insulated/isolated, and "low impedance" is equal to be connected or at least is equal to NOT "high impedance", didn't you ?
If so, I have been misunderstood and please ignore my previous question.
Then, when you talked about sum of the current loaded to the reference input, did you subject to both of above two cases, since anyhow current has to be consumed in both cases, so need to be calculated total loads, didn't you ?
Even so, I still do not understand why "the reference is probably short- circuited to GND" when VDD supply is at low impedance. If you briefly provide simplified scheme/diagram, it would be very much appreciated.
Thank you very much for your kind helps, as always.
Best Regards,
