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Monolithic Power Systems (MPS) EV3921-U-00A Controller Evaluation Board

Monolithic Power Systems (MPS) EV3921-U-00A Controller Evaluation Board is designed to demonstrate the capabilities of the MP3921. The MP3921 is a single-port power-sourcing equipment (PSE) power controller for IEEE 802.3af/at-compliant Power Over Ethernet (PoE) applications. The MPS MP3921 provides all the functions of IEEE 802.3af/at, including detection, single-/two-event classification, current limiting, and disconnected load detection. All functions can be configured to operate in automatic or software configuration mode via I2C.

Features

  • IEEE802.3af/at compliant
  • 0.25Ω current-sense resistor (RSENSE)
  • Automatic mode and I2C command control mode
  • Internal VCC power supply
  • Three-wire I2C interface for isolated applications
  • Two INT pins for interrupt priority selection
  • Disconnected DC load detection
  • Instantaneous current/voltage readout
  • Configurable I2C address
  • Thermal protection

Applications

  • PSE switches/routers
  • PSE midspan power injectors
  • Surveillance Network Video Recorders (NVRs) and Digital Video Recorders (DVRs)

Additional Resources

Board Layout

Mechanical Drawing - Monolithic Power Systems (MPS) EV3921-U-00A Controller Evaluation Board

Related PSE Power Controller

Monolithic Power Systems (MPS) MP3921 Single-Port PSE Power Controller

This device is designed for IEEE 802.3af/at-compliant Power over Ethernet (PoE) applications.

Learn Moreabout Monolithic Power Systems (MPS) MP3921 Single-Port PSE Power Controller View Productsrelated to Monolithic Power Systems (MPS) MP3921 Single-Port PSE Power Controller
Published: 2026-01-30 | Updated: 2026-02-09