W5500 no 1.2v


#1

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?

thanks.


#2

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


#3

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