I have an existing circuit using the AD5421 as a 2-wire loop-powered transmitter. It has a CPU, LCD display, sensor ADC, and an AD5700 for Hart transmission. Works great.
My customer wants to add additional circuitry that would only be used if the device was connected in a 3-wire configuration, since it would draw too much current for loop power. So the device would be able to operate as either a loop-powered (2-wire) device or as an externally powered 3-wire device with additional capabilities.
Can I accomplish this with the AD5421?
If so, what do I need to change?
If not, is there another part that I can use?
