I think you need to explain the issue, not just ask questions in general. You need to know amperage of power supply device to power the W5500 so that there would be no communication failure because of lack of power?
Kirchhoff’s law should apply. But you must take into account that related circuits are not only resistive, and that their power consumption depends on operation being performed. Again, see typical value in the datasheet for reference schematic (typical) application.
Hello WIZnet support team, thank you for your reply .
I’d like to explain back ground as below.
Customer wants to reduce power consumption of 3.3V DC. Because of cost of regulator IC.
Request
Please advise how to measure power consumption for 3,3V DC.
I attached customer circuit and their measurement way.
I try to upload customer circuit but not succeeded.
Please send me recommended PCB layout application note or Gerber data example for reference circuit.
Best Regards
Future Electronics
TSM Hiroshi Iwasaki
Yokohama Land mark Tower 30F
Minato Mirai 2-2-1 Nishi-ku, Yokohama, Japan
Zip code : 2208130
Tel : 81-45-224-2155
Fax: 81-45-224-2156
Hello Scott-san, thank you for your reply.
Could you please let me know the power up and power down sequence for VDD and AVDD ?
Because customer will use two DCDC regulator For VDD and AVDD.
Is this possible to power up and power down both power line simultaneously ?
As a guess - Hiroshi’s customer wants to physically power down PHY through switching AVDD regulator off. Is it allowed for WIZnet products - having VDD present and AVDD absent?
Hello Scott –san, thank you for your advice.
I tell customer to ON OFF VDD and AVDD at the same time.
Customer measure current consumption of VDD and AVDD and the result is bigger than data sheet.
So, they consider to prepare Voltage regulator individual.