XTR117: XTR117 in a 2/3-wire situation

Jonathan Plenske

Part Number: XTR117
Other Parts Discussed in Thread: XTR111, XTR115, XTR116

Hi,

is it possible to use the XTR117 in a 2/3 wire loop situation. The goal is to set for example an jumper to switch between 2 and 3 Wire.

In the 2 wire situation the XTR117 is connected as described in the datasheet.

In the 3 wire situation the Iret (Pin3) is disconnected and rest of the circuit is then connected to the 3 wire GND.

Is this possible? What are the implications?

If it is not possible is there a solution for that kind of situation? Is this maybe possible with the XTR111?

Thanks!

Best regards

Steffen

over 3 years ago

0 kai klaas69 over 3 years ago

Guru 140200 points

Hi Steffen,

the working principles of 2-wire and 3-wire transmitters are totallly different. Remember, for instance, the fully floating versus ground referenced input signal grounds.

Why would you want to do that? Can you elaborate what you intend to do? Can you tell more about the circuitry connected to the input of transmitter?

Kai

0 Raymond Zhang1 over 3 years ago

TI__Guru* 76381 points

Hi Steffen,

Enclosed is the application note for 4-20mA current loop. I am also attaching the video links on the topics for your reference.

0172.4-20mA_Basics.pdf

https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/945188/faq-designing-with-4-20ma-current-loop-transmitters-xtrs-faq-links?tisearch=e2e-sitesearch&keymatch=4-20mA%2525252525252520current%2525252525252520loop%2525252525252520videos#

As Kai indicated, please provide design requirements for your 2 or 3 wire 4-20mA transmitter application. We can send you relevant simulation and/or suggestions once you decided what the application is for.

FYI, 3-wire 4-20mA transmitter in XTR111 is easier to configure vs. 2-wire 4-20mA transmitter as in XTR115/XTR116/XTR117 and others.

Best,

Raymond

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XTR117: XTR117 in a 2/3-wire situation