I am using a LDH-45 LED Driver (datasheet) with an I2C DAC as dimmer on the analog DIM pin.
The DAC uses the same power supply as the Driver (with a linear regulator), so they share the same GND.
The datasheet clearly tells me NOT to connect the DIM- pin with VIN- (PSU Ground), however when I measure the resistance between these pins with the Driver disconnected it reads Zero Ohm.
So.. I'm a bit confused since it tells me not to connect them while it seems they are indeed connected. How should I lay my PCB out? Should I leave the DIM- pin "floating" and use the VIN- as a star point for the DAC..?