Of the following pins, which ones are "latched" in at time of power-on reset of AD5421?
The AD5421 powers on with all registers loaded with their default values and with the loop current in the alarm state set to 3.2 mA or 22.8 mA/24 mA (depending on the state of the ALARM_CURRENT_DIRECTION pin and the selected range).
The most pins that you mentioned are input pins in a sense that the part will power up and will set settings of the part depending on the values of these pins.
I am Using this AD5421 in 4-20 mA mode.
Ans I am not able to set current less than 6.5 mA but above 6.5mA i am getting all the values.
Please let me know what is the issue.
The text on the schematics is hard to read. Can you provide better images?
The text on the schematic is still not clear. I can't read the components used.
Considering the maximum supply current drawn from the DVDD of AD5421.
These would already be equal to 5.15mA. We haven't even added the current drawn from the pull-up resistors, LEDs etc.
Thanks for your reply.
I have removed all the pull-up resistors that were there near the isolators.
Now I am getting 3.12mA current when I give the eternal 24 V supply.
It is working now.
Thanks & Regards
For similar schematics with AD5420, AD5421 and AD5700 I'm trying to determine load resistor.
Please help me out.
Nidhi P Shetty
Can you create a separate query for this one please?
Please provide complete schematics and the problem you are encountering.
I have one more doubt on AD5420. If I don't provide AVDD and if DVCC select is not connected and if I connect 3.3V to DVCC externally whether AD5420 consumes 1mA from external voltage that I have connected?