Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Function | Power-over-Ethernet PSE controller |
| PoE ports | 4 |
| Standard support | IEEE 802.3af/at |
| Host interface | I2C |
| Monitoring | 9-bit ADC for current and voltage |
| Current-sense resistor | 0.25 Ω feature value |
| Package | QFN-32, 5 × 5 mm |
| Product status | Active |
Product Overview
The MP3924GU-Z is an active MPS four-port Power-over-Ethernet power-sourcing-equipment controller. It manages detection, classification, power application and monitoring for four IEEE 802.3af/at PoE source ports and provides an I2C interface for system supervision.
Its exact system role is PSE, meaning it belongs on the side that supplies power onto the Ethernet cable. It should not be classified as a powered-device controller. The device includes a 9-bit ADC for voltage/current monitoring, configurable I2C addressing and both automatic and host-command operating modes.
Technical Specifications
| Parameter | Confirmed Information |
|---|---|
| PoE role | PSE, power sourcing equipment |
| Port count | 4 |
| Standards | IEEE 802.3af/at |
| Control modes | Automatic and I2C command control |
| I2C addressing | 4-bit configurable address |
| Monitoring ADC | 9 bit |
| Monitored quantities | Port current and voltage |
| Current-sense resistor feature | 0.25 Ω |
| Protection | Input over-power shutdown, disconnected-load detection, thermal protection |
| Package | QFN-32, 5 × 5 mm |
| Exact order code | MP3924GU-Z |
| Carrier information | 5000 per reel |
| Product status | Active |
Design Considerations
A PSE design must account for port power budget, current sensing and isolation/magnetics architecture at the system level. The MP3924 manages the PoE power-control logic, but external pass devices and current paths still need to meet the required per-port power and thermal limits.
I2C telemetry is useful for managed switches, but autonomous operation is also available. Choose the control mode from fault-response and system-management requirements rather than assuming a host processor is mandatory.
Related Engineering Resources
- MP3924 Quad-Port IEEE 802.3af/at PSE Controller Product Resources
Quality & Verification Support
Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. After an order is placed, physical product, label, packaging, and Date Code photos may be provided where appropriate.
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To request a quotation, provide the manufacturer part number, required quantity, destination, target Date Code if applicable, and any testing or inspection requirements.
