As per above diagram, if the MOSFET is in circuit, the AD5421 does not produce any output. If I bypass the MOSFET then when micro is not programmed and 24V is applied to the 4-20mA output loop, the current is 3.2mA as specified by datasheet. When I load DAC with either 0x0000 or 0xFFFF to DAC the output goes to 0.22mA always.
I tried changing the values of OFFSET ADJUST REGISTER and GAIN VALUE REGISTER but has no impact on the values.
The voltage at V_LOOP is 0.9V
Voltage at DRIVE: No Voltage (which is bit surprising)
I will appreciate any clues.