pauldeng / arduino-leonardo-eth-w5500-powerdown-example

Power down WIZnet W5500 Ethernet controller

Arduino W5500 Ethernet Controller Power Saving Example

This repo contains WIZnet W5500 power saving example code.
It demonstrates:

• Power down W5500
• Power saving by setting the W5500 to low speed (10Mbps)

Hardware

Any Arduino board/Shield with WIZnet W5500 Ethernet controller. I tested it on:

• RobotDyn Leonardo ETH v2
• DFRobot W5500 Ethernet with POE IoT Board (Arduino Compatible) V2

Software Library

This branch uses Arduino standard Ethernet library.
If you use Ethernet3 library, you can switch to branch arduino-sstaub-ether3-lib.

Usage

1. Clone this project
2. Choose the branch
3. Load this project to PlatformIO
4. Compile and load to target hardware
5. Measure the power consumption change

Power Consumption

A simple USB power meter is used to measure the whole board power consumption (including the MCU). At 5.20V, I observed the RobotDyn Leonardo ETH v2:

• W5500 All capable, Auto-negotiation enabled: ~170mA
• W5500 10BT Half-duplex, Auto-negotiation disabled: ~120mA
• W5500 Power Down mode: ~80mA

By using Adafruit SleepyDog library, you can further reduce ~20mA from MCU.

References

• WIZnet W5500 Datasheet
• Ethernet3 PHY Configuration
• https://github.com/RobotDyn/Leonardo-ETH-V2

License

MIT