TI TPS2388：8通道IEEE 802.3at PoE控制器详解

需积分: 9 159 浏览量更新于2024-06-29 5 收藏 2.5MB PDF 举报

TI-TPS2388是一款高性能的以太网电源供应器控制器，设计用于满足IEEE 802.3at标准，也称为PoE++，支持8个通道的Power over Ethernet (PoE) 功能。该设备的核心特性包括： 1. **兼容性**：TPS2388完全符合IEEE 802.3at标准，确保了与各种PoE设备的无缝配合。 2. **端口灵活性**：具备端口重映射功能，允许用户根据需求调整电源分配，支持1位和3位快速端口关断输入，提高了管理效率。 3. **智能检测**：“永不受骗”4点检测技术，确保只有认证的PD设备才能获得电源，增强了系统的安全性。 4. **电源分类**：支持1类和2类PD分类，这意味着它能根据不同功率需求为不同类型的设备供电。 5. **电流控制**：具有可编程电流限制功能和折返功能，允许精确控制输出电流，同时具备直流断开检测，适应不同应用场景。 6. **运行模式**：提供灵活的处理器控制模式，包括半自动和手动，便于系统管理和优化。 7. **监控能力**：内置14位端口电流和电压监控，包括100ms滚动平均和高精度电流感应（2%），以及0.255Ω的开尔文感应电阻器，增强数据采集和分析。 8. **通信接口**：支持I2C通信，用于故障保护和多种访问模式（8位和16位），方便与外部设备交互。 9. **温度范围**：工作温度在-40°C至125°C，确保在严苛环境下的稳定运行。 10. **封装形式**：采用紧凑的56引脚VQFN封装，节省空间，适合小型化设计。 TPS2388广泛应用于企业级交换机、路由器、PoE直通电源模块以及网络录像机（NVR）等需要PoE供电的设备中，为这些设备提供可靠、高效且安全的电源解决方案。值得注意的是，文档结尾的注意事项涵盖了产品可用性、保修、安全关键应用使用限制、知识产权声明以及其他重要免责声明，用户在使用前应仔细阅读。

SEN

GATE

0 V

LIM

CUT

OVLD

pon

PORT

0 V

Four-point

detection

DET

CLE

Class

CLASS

MARK

Mark

Port turn-on

TPS2388

www.ti.com.cn

ZHCSGR0A –FEBRUARY 2015–REVISED AUGUST 2017

Timing Diagrams (continued)

Figure 14. Detection, 2-Event Classification and Turn On

Figure 15. Overcurrent Fault Timing

IDLE

START bits

SC 2

one-bit

duration

bit_OSS

OSS_IDL

3.3 V

0 V

SC 1

OSS

SC 0

Shutdown Code

GATE

OSS_OFF

IDLE

r_OSS

f_OSS

TPS2388

ZHCSGR0A –FEBRUARY 2015–REVISED AUGUST 2017

www.ti.com.cn

8.3 Feature Description

8.3.1 Port Remapping

The TPS2388 provides port remapping capability, from the logical ports to the physical ports/pins.

The remapping is between any port of a 4-port group (1 to 4, 5 to 8).

The following example is applicable to 0x26 register = 00111001, 00111001b.

• Logical port 1 (5) ↔ Physical port 2 (6)

• Logical port 2 (6) ↔ Physical port 3 (7)

• Logical port 3 (7) ↔ Physical port 4 (8)

• Logical port 4 (8) ↔ Physical port 1 (5)

NOTE

The device ignores any remapping command unless all four ports are in off mode.

If the TPS2388 receives an incorrect configuration, it simply ignores the incorrect configuration and keeps the

configuration unchanged. The ACK is also sent as usual at the end of communication. For example, if the same

code is received for more than one port, then a read back of the Re-Mapping register (0x26) would be the last

valid configuration.

Also note that if an IC reset command (1Ah register) is received, the port remapping configuration is kept

unchanged. However, if there is a Power-on Reset or if the RESET pin is activated, the Re-Mapping register is

reinitialized to a default value.

8.3.2 Port Power Priority

The TPS2388 supports 1- and 3-bit shutdown priority, selectable with the MbitPrty bit of General Mask register

(0x17).

The 1-bit shutdown priority works with the Port Power Priority (0x15) register. An OSSn bit with a value of 1

indicates that the corresponding port will be treated as low priority, while a value of 0 corresponds to a high

priority. As soon as the OSS input goes high, the low-priority ports are turned off.

The 3-bit shutdown priority works with the Multi Bit Power Priority (0x27/28) register, which holds the priority

settings. A port with “000” code in this register has highest priority. Port priority reduces as the 3-bit value

increases, with up to 8 priority levels. See Figure 16.

The port priority is defined as the following:

• OSS code ≤ Priority setting (0x27/28 register): OSS code turns off the port

• OSS code > Priority setting (0x27/28 register): OSS code has no impact on the port

Figure 16. Multi-Bit Priority Port Shutdown if Lower-Priority Port

剩余86页未读，继续阅读

不觉明了

粉丝: 4230
资源: 5759

TI TPS2388：8通道IEEE 802.3at PoE控制器详解

"TI-TPS24742.pdf: TPS24742数据手册和样品下载

高压区间可调控制器TI-TPS40052.pdf特性与应用指南

"TI-TPS51103.pdf: 特性描述与应用电路分析

TI-TPS25940.pdf

TI-TPS2075.pdf

TI-TPS659128.pdf

TI-TPS65680.pdf

TI-TPS60503.pdf

TI-TPS92360.pdf

TI-TPS65137.pdf

最新资源