Firmware
TPS23881B-DESIGN — TPS23881B Design Resources
Latest version of SRAM and Parity Code for TPS23881B
Data sheet
TPS23881B
- IEEE 802.3bt PSE solution for PoE 2 Type 3 or Type 4 power over ethernet applications
- Eight independent PSE channels
- Resistor selectable autonomous operation
- No external MCU required
- Compatible with TI’s FirmPSE system firmware
- SRAM Programmable memory
- Programmable power limiting accuracy ±2.5%
- 200mΩ current sense resistor
- Legacy PD capacitance measurement
- Selectable 2-pair or 4-pair port power allocations
- 15.4W, 30W, 45W, 60W, 75W or 90W
- Single and dual signature PD compatibility
- Dedicated 14-bit integrating current ADC per port
- Noise immune MPS for DC disconnect
- 2% current sensing accuracy
- 1- or 3-bit fast port shutdown input
- Auto-class discovery and power measurement
- Inrush and operational foldback protection
- Flexible processor controlled operating modes
- Auto, semi auto and manual / diagnostic
- Per port voltage monitoring and telemetry
- –40°C to +125°C temperature operation
- Ultra Low Alpha (ULA) packaging (TPS23881B1A)
The TPS23881B is an 8-channel power sourcing equipment (PSE) controller engineered to insert power onto Ethernet cables in accordance with the IEEE 802.3bt standard. The eight individual power channels can be configured in any combination of 2-Pair (1-channel) or 4-Pair (2-channels) PoE Ports. The PSE controller can detect powered devices (PDs) that have a valid signature, complete mutual identification, and apply power.
The TPS23881B improves on the TPS2388 with reduced current sense resistors, selectable Autonomous operation, SRAM programmability, programmable power limiting, capacitance measurement, and compatibility with TI’s FirmPSE system firmware (see Device Comparison Table).
Programmable SRAM enables in-field firmware upgradability over I2C to ensure IEEE compliance and interoperability with the latest PoE enabled devices. Dedicated per port ADCs provide continuous port current monitoring and the ability to perform parallel classification measurements for faster port turn on times. A ±2.5% accurate programmable port power limit provides the ability to expand the maximum power sourced from 90W to upwards of 125W. The 200mΩ current sense resistor and external FET architecture allow designs to balance size, efficiency, thermal and solution cost requirements.
Technical documentation
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View all 1 | Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | TPS23881B Type-4 4-Pair 8-Channel PoE 2 PSE Controller with Autonomous Mode and 200 mΩ RSENSE datasheet (Rev. A) | PDF | HTML | 08 May 2025 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Evaluation board
BOOST-PSEMTHR8-097 — TPS23882 Type-3, 30W, 2-pair, PSE motherboard for 8-port PSE systems
This motherboard is the base board for the PSE Controller ecosystem. The octal channel, TPS23882, IEEE 802.3bt ready PoE PSE controller can be evaluated by using the motherboard (BOOST-PSEMTHR8-097) and TPS23882EVM daughter card (TPS23882EVM-008) (sold separately). The full PoE Evaluation ecosystem (...)
User guide: PDF
Daughter card
TPS23881B1EVM-024 — TPS23881B daughter card
The TPS23881B1EVM is the daughter card to evaluate the TPS23881B which is a four-pair, type-4, eight-channel Power-over-Ethernet (Poe) PSE with autonomous mode. The daughter card provides evaluation and reference circuitry for the TPS23881B which is suitable for high power PSE applications.
Simulation tool
PSPICE-FOR-TI — PSpice® for TI design and simulation tool
PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VQFN (RTQ) | 56 | Ultra Librarian |
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