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Answered

Max current on XC43 -VREF pins

Kevin 1 month ago in Expansion modules / XC4x • updated by Gustav Widén (System support) 2 weeks ago • 1

We are providing some sensors with a 0V supply through the VREF circuit on XC43 module but cannot find the maximum current capacity of these pins. The manual states VREF has a limit of 150mA, but is this limitation on both the +ve side and -ve side?

I was under the impression -VREF is connected internally to the -BATT terminals, therefore does this mean there is a higher current limit? I cant find a value in the manual:

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Answered
Gustav Widén (System support) 2 weeks ago

The 150 mA is what the XC4 +VREF can source. 

As you guessed, the -VREF can withstand much higher current, up to 10A continuous. 

(some more discussion on what this means here Fault Capacity of -VREF / Hardware / IQAN )

But avoid running such high currents in the wires going to -VREF, as that could elevate your sensor ground.

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