Article If not used, can MAX22190 LEDx pin be floated?

It is absolutely necessary to connect the LED pins to GND if not used, or connect a LED diode between LED pin and GND. 

Our internal current source is between the input pin and LED pin. If LED pin is floating, the negative terminal of the current source is floating. When the input is high (24V is applied to the input), the current source would pullup the LED pin through internal diode and clamp, which would violate the ABS MAX of the LED pin, thus might damage the device.

Also, when LED pin is floating, the current source is not working properly, there will be no input current when input is high, which violates the digital input standard.
 

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