W5500 no 1.2v

I’ve just built a new PCB with the W5500, and it does not respond to any SPI commands.

I have verified all the ground and 3.3v pins are connected to power supply.

I measure zero volts on pins 1V20, TOCAP and VBG.

Is there something that needs to be done to enable the internal 1.2v regulator, or some reason it isn’t functioning?


OK, problem solved. It was in fact a bad solder joint on pin 21, AVDD, right next to the 1V20 pin.

Sometimes small thing make problem.
Anyway it’s good to hear that you find the cause of the problem.