Which strap resistor value to use for LAN9303?
The LAN9303 datasheet currently does explictly specify a strapping resistor value. However, the evalboard schematic effectively uses a 10kΩ
resistor when strapping to GND or a 20kΩ
resistor when strapping to VDD. I have experimentally verified that 10kOhm strapping resistors work when strapping to GND. On my boards, I do not explicitly strap to VDD because most strappable pins have internal pull-ups and I don’t need to use the LEDs.
Hence, my recommendation is to strap the LAN9303 using 10kΩ
resistors.