IP804A：4端口PoE控制器，兼容IEEE 802.3AF/AT标准

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IP804A是一款由ICPlus电子公司开发的数据手册，专为PoE (Power over Ethernet) 系统设计的高性能4端口PSE (Power Sourcing Equipment) 控制器。这款芯片旨在满足IEEE 802.3AF-2003和802.3AT-2009标准，提供一个全面的解决方案，适用于中端和终端设备的供电需求。该芯片的主要特点包括： 1. **兼容性**：IP804A严格遵循IEEE 802.3AF-2003和802.3AT-2009协议，确保了在PoE网络中的稳定和兼容操作。 2. **电源输入**：它采用单一直流供电，输入电压范围为45~57V，适应广泛的供电环境。 3. **温度范围**：IP804A具有宽广的工作温度范围，-40℃至+85℃，确保在极端条件下也能正常工作。 4. **功能模块**：集成4个独立的电源端口，内置功率FETs进行高效电流控制，支持I2C总线通信，可连接多达8个IP804A设备。 5. **监控与设置**：对每个端口进行持续的系统监控，并允许独立设置系统参数，包括热保护功能，提供了灵活的配置选项。 6. **辅助功能**：内置3.3V稳压器为外部设备供电，内置Power-on Reset功能，便于系统启动时自动恢复。 7. **配置规格**：标准配置支持30W功率分配到每个端口，具备总电流限制功能，以及内置LED控制和EEPROM接口，适用于无需复杂配置的应用场景。 8. **封装与温度**：采用紧凑的48引脚(7mmx7mm) MQFN封装，适用于-40~85℃的环境操作。 9. **应用场景**：作为4端口PSE开关，IP804A适用于多种PoE应用，无论是作为中端设备提供电源还是作为终端设备的集中控制器，都能有效满足需求。 ICPlus电子的IP804A数据手册详细介绍了这款芯片的强大功能和特性，是PoE系统设计者和工程师在选择和使用此类设备时的重要参考文档。其高效、稳定和灵活的设计使其在现代网络环境中扮演着关键角色。

IP804A

Preliminary Datasheet

9 / 47 May 2, 2017

3.1.1 Global Blocks

¾ Reference & Regulator:

The Reference & Regulator generates 2.5V, 3.3V and 5V power for internal use and 3.3V power

also can supply typical 6mA current on V3P3 pin for external devices if EnB_Reg pin is connected to

GND. If EnB_Reg is conncted to 3.3V, the internal 3.3V regulator is disabled and V3P3 pin should be

connected to an external 3.3V power source.

It also generates 1.25V voltage on VREXT pin, which is connected to ground through an external

62KΩ resistor, to generate internal bias current.

¾ Registers:

The “Registers” provides the 8 bits data for Ilim, Icut programming registers, and all other needing

registers per port

¾ Control Management & State Machine:

This block provides all the control procedures to perform PoE function. The “State Machine”

implements as specified in the IEEE802.3AF/AT.

¾ Power Management:

The “Power Management” provides power management method to meet PD power requirement, or

not to power PD if power is not enough.

¾ 10 Bits ADC:

The 10 Bits ADC used to convert analog signals into digital bus for Control Management, State

Machine, and Power Management for request.

¾ POR & OSC:

The POR generates an internal power on reset signal when V54 is power on. The POR also

monitors V3P3, DV3P3, V5, & V54 voltage level. If these voltages level are below specific thresholds, a

reset signal generates and resets IP804A.

The OSC is an internal oscillator to generate 8MHz clock for IP804A timing source.

¾ I

C Interface:

A host (master) can communicates with multiple IP804A (slave) via I

C Interface (SCL/EE_CLK,

SDAO, SDAI/EE_DAT) to collect PD power status to support global power managements and all

control requirements.

IP804A

Preliminary Datasheet

10 / 47 May 2, 2017

3.1.2 Per Port Block

¾ Detection:

The IP804A uses 4 points detection method to discover PD. It shall accepted resistance as a valid

“AF/AT PD” between 19KΩand 26.5KΩ, with a paralleled capacitance small than 0.15uF.

It shall rejects resistance with paralleled capacitance as an invalid “AF/AT PD” small than 15KΩ,

larger than 33KΩ, or capacitance larger than 10uF.

The specification is as specified in the IEEE802.3AF/AT.

¾ Classification:

The “Classification” is to distinguish the requested power of PD as specified in the IEEE802.3AF/AT.

In IEEE 802.3AF, classification is 1-event method.

In IEEE 802.3AT, classification is 2-event method.

¾ I/V Control:

The “I/V Control” is to control the slew rate during “detection, classification, inrush, short circuit,

power off … and so on”, as specified in IEEE802.3AF/AT

When short circuit event occurs, the “I/V control” will reduce the port current instantaneously to

protect the power MOSFET from damages.

¾ Amp:

The “AMP” is used to convert the differential voltage between V54 and PortNx into single end

voltage. This voltage will be fed into the “Detection, Classification, I/V Control” blocks to perform the

IEEE8023AF/AT specifications.

¾ DC Disconnect:

The IP804A supports DC Disconnect function according to IEEE 802.3AF-2003 & IEEE

802.3AT-2009 requirement.

This DC Disconnect continuously monitors port current after port inrush time, and disconnects port

current when port current is below 7.5mA (typical) for more than 360ms (typical) .Please refer to

Tmpdo in table 8 for detail information.

¾ T sensor & Thermal Shutdown:

The “T sensor” senses the temperature of each port, and will shutdown the port current as

temperature beyond 150 . When temperature goes down to 129 , the port will start again. ℃℃

¾ Bias:

The “Bias” provides the current & voltage bias for all ports according to control signals.

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