XTR116: TPS54062

Annika Mader

Part Number: XTR116
Other Parts Discussed in Thread: ISO7310C, XTR110, XTR111

My update.

I connect the Loop GND to the 2 pin connector (+24V and GND) and then I let the Float_gnd (only pin 3 from the XTR116) "float" on the PCB, with out connection to the Earth GND, is that correct?

Only IRet is Float gnd?

Or do I need a ISO7310C for my Sensor GND?

3 months ago

0 Clemens Ladisch 3 months ago

Guru 259160 points

The I_RET pin is the reference for the input voltage. If you let it float, your V_IN will not be measured correctly. (And you must not connect I_RET to a fixed ground like I_O or LOOP_GND.)

The XTR116 is designed for circuits that are supplied from the current loop. With a separate supply, you probably want a three-wire transmitter like the XTR111/XTR110.

0 Raymond Zhang1 3 months ago

TI__Guru 51681 points

Hi Annika,

As Clemens indicated, LOOP_GND can not be used in the configuration in 2-wire loop transmitter. The V_IN signal has to be referenced to I_RET node, see the link below.

https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/945188/faq-designing-with-4-20ma-current-loop-transmitters-xtrs-faq-links

Annika Mader said:
Or do I need a ISO7310C for my Sensor GND?

If you use ISO7310C digital isolator, then your sensor signal has to be sent via PWM and convert to analog (filtered and average out at the analog side). For certain application that is fine. For ultra precision application, then it may not be adequate.

Please let me know your sensing application. Perhaps you will need XTR111 as Clemens suggested.

Best,

Raymond

0 Annika Mader 3 months ago in reply to Raymond Zhang1

Prodigy 30 points

Thank you.

We have a sensor with analog output between 0.5-4.5V.
And we would like to use it to create a 2-wire transmitter solution. For our 3-wire solution, we use already the XTR111.

0 Raymond Zhang1 3 months ago in reply to Annika Mader

TI__Guru 51681 points

Hi Annika,

Annika Mader said:
We have a sensor with analog output between 0.5-4.5V.

Here is the simulation. Please make sure that the input signal is referenced to Iret pin or node. Otherwise, it will not work in 2-wire transmitter.

XTR117 0.5 to 4.5V 4-20mA 04222024.TSC

If you have other questions, please let us know.

Best,

Raymond

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XTR116: TPS54062