Overview
The TPS23881ARTQR from Texas Instruments is an 8-channel power sourcing equipment (PSE) controller designed to comply with the IEEE 802.3bt standard for Power over Ethernet (PoE) applications. This device is engineered to insert power onto Ethernet cables and can detect powered devices (PDs) with valid signatures, complete mutual identification, and apply power accordingly. The TPS23881 improves upon its predecessor, the TPS23880, with enhanced features such as reduced current sense resistors, more accurate programmable power limiting, and capacitance measurement. It is also compatible with TI’s FirmPSE system firmware, enabling a fully configurable solution for controlling multiple devices in systems offering up to 48 ports of 4-pair PoE power.
Key Specifications
| Parameter | Value |
|---|---|
| Package | VQFN (RTQ) with 56 pins |
| Operating Temperature Range | -40°C to 125°C |
| Supply Voltage Range | 44-57V |
| Number of Channels | 8 independent PSE channels |
| Current Sense Resistor | 200-mΩ |
| Power Limiting Accuracy | ±2.5% |
| Port Power Allocations | Selectable 2-pair or 4-pair port power allocations |
| Maximum Power per Port | 15.4 W, 30 W, 45 W, 60 W, 75 W, or 90 W |
Key Features
- IEEE 802.3bt PSE solution for PoE 2 Type 3 or Type 4 Power over Ethernet applications
- Eight independent PSE channels configurable in any combination of 2-Pair (1-channel) or 4-Pair (2-channels) PoE Ports
- Compatible with TI’s FirmPSE system firmware for controlling multiple devices
- SRAM Programmable memory for in-field firmware upgradability over I²C
- Programmable power limiting accuracy ±2.5%
- Legacy PD capacitance measurement
- 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
- Ultra Low Alpha (ULA) packaging (TPS23881A)
Applications
The TPS23881ARTQR is suitable for various Power over Ethernet (PoE) applications, including but not limited to:
- Network switches and routers
- IP phones and video conferencing systems
- Wireless access points and small cells
- Security cameras and surveillance systems
- Building automation and control systems
Q & A
- What is the TPS23881ARTQR?
The TPS23881ARTQR is an 8-channel power sourcing equipment (PSE) controller designed for Power over Ethernet (PoE) applications according to the IEEE 802.3bt standard.
- What are the key features of the TPS23881ARTQR?
Key features include eight independent PSE channels, programmable power limiting, legacy PD capacitance measurement, and compatibility with TI’s FirmPSE system firmware.
- What is the operating temperature range of the TPS23881ARTQR?
The operating temperature range is -40°C to 125°C.
- What is the maximum power per port for the TPS23881ARTQR?
The maximum power per port can be 15.4 W, 30 W, 45 W, 60 W, 75 W, or 90 W.
- Is the TPS23881ARTQR compatible with other TI firmware?
Yes, it is compatible with TI’s FirmPSE system firmware.
- What type of memory does the TPS23881ARTQR use?
The device uses SRAM Programmable memory for in-field firmware upgradability over I²C.
- What is the current sense resistor value in the TPS23881ARTQR?
The current sense resistor value is 200-mΩ.
- Does the TPS23881ARTQR support single and dual signature PDs?
Yes, it supports both single and dual signature powered devices (PDs).
- What is the current sensing accuracy of the TPS23881ARTQR?
The current sensing accuracy is 2%.
- What are the processor-controlled operating modes of the TPS23881ARTQR?
The operating modes include auto, semi-auto, and manual/diagnostic.
