AnsweredAssumed Answered

AD5421 REGOUT problem

Question asked by Jake01 on Jun 15, 2016
Latest reply on Jun 20, 2016 by msamera

Hi, Everyone


I've added 5kohm on 24V loop power for testing impedance curve.(24V supply -> 5kohm -> DUT loop+)

At this time,

- around 3.75mA current is measured at loop+

- When I test the loads with power supply 3.3V, 2.8mA is measured for MCU + AD5700(MCU and AD5700 are powered from REGOUT(3.3V))

* Disconnected from the REGOUT power to loads(AD5700 and MCU), and then supplied power from the power supply 3.3V.

- When I test the loads with power supply 3.3V, MCU consumes 1.88mA


Q1. Is there any solution to reduce current?

Q2. As I attached, REGOUT(3.3V) and LOOP+ power is dropping when Board is powered continueously.

Look like RESET IC is reseting MCU when REGOUT dropped to 3.0V. At this time, LOOP+ power is dropped to 5V.

How much current can be drown by REGOUT?





If need more information, feel free to let me know.