Hi I have been reviewing the INA303 and would like to use it with the delay. I followed the example you have on page 15 of the data sheet but the equation does not work out for me. I am using Vth = 1.22 V and Id = 5 uA per the Electrical Characteristics but that does not give me the same capacitor value. Do I need a pull-up resistor on the DELAY pin to set Id? What does Vdelay = 0.6 V in the Electrical Characteristics for Id imply - is that related?
I would also like to confirm with the DELAY, that if I am detecting an undercurrent condition and the input crosses under and then back over the threshold during the delay, I should not see any change in the ALERT2* output. This seems to be implied in the plot on page 17, and is stated more explicitly for the example on page 18, but I am using the configuration shown on page 17 and would just like to make sure this is the case.
A couple of other smaller questions, unrelated to the DELAY but specific to the INA303:
- what is the current capacity of the ALERT* pins? The VOL of the comparators specs an IOL of 3 mA. I would like to use this output to sink 1-2 mA to toggle an LED.
- the differential inputs of the amplifier are spec'd with a +/- range with Vref = Vs/2. For the INA303, it is spec'd at +/-25 mV. If my REF pin is grounded, does that mean the inout range is 0-50 mV? The example on page 19 seems to imply this.
Thank you!
Jeff