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The PD utilizes a dedicated pin, allowing an immediate disconnection of the PoE dataasheet. Line Detection Circuitry — when performing a line detection procedure, the PoE device utilizes certain voltage levels over the output port. No additional voltage sources e. This disable-port pin can be controlled via the Host CPU. These levels are produced by switched resistor dividers and sensed by the PD in order to confirm a valid PD connection.

For a single port, the system worst case cl21b1104kbac dissipation can be calculated as follows. Supports Back-off feature for Midspan implementation Including support for high power and 2-events classification. Figure 1 shows the device with its cl211b104kbac components for a 1-port configuration. If an adequate 5V power source is available, the 5V regulation circuitry can be removed and the zener diodes may be replaced by lower current 5mA zener diodes but with same voltage requirements.

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This signal should be optically coupled by the Host in order to maintain the requirements for the Vrms isolation. In cases where the ambient temperature drops below Vl21b104kbac, or the product does not have to meet The CAP option is pre standard Capacitor detection mode.


This PWM signal is filtered and utilized as the current limit circuitry voltage reference. It allows the user to choose a combination of three features, as specified in the following table: Output port – The load resistance of the PD attached to the port is presented in parallel with R Each PD device handles one port.

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The resulting voltage developed across both resistances is cp21b104kbac to establish the Enables detection and powering of all Cisco devices including pre-standard terminals.

The PD can operate over a wide temperature range: Control A Reset control signal driven by the switch circuitry is used to reset the PoE circuit. This power must be isolated from the switch supply and chassis by Vrms.

This ground plane should be Vrms isolated from the PoE circuitry as well as the power supply for the PoE circuitry. The Rsense in PD applications is only 1? The D15 and D16 should be selected for the application main voltage as follows: Classification Circuitry — After a port is investigated, the PD should be classified by a classification current signature.

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Multi — point resistor detection? Grounds There are several grounds used in the system: Enables detection and powering of pre-standard power devices PDs.


Exposure to absolute maximum rating conditions datasbeet extended periods may affect device reliability. The digital and analog grounds are electrically the same ground. Stresses beyond those listed above may cause permanent damage to the device.

It operates in a total stand-alone mode, with no need for user intervention. The PD requires a single DC voltage source: Cl21b104kbbac Mosfet, increasing the flexibility of the solution and allowing it to be tailored for the power needs of the customer. AC disconnect and DC disconnect function? With a minimum of external components, the PD integrates in a one-port or two- port PoE-port switches and Midspans.

Direct driving of the LED circuitry. The PD has a very low thermal dissipation. Visit our web site at: However, in order to reduce cl21b104knac coupling, the grounds are physically separated and connected only at a single point. The values are fixed for each mode of operation and described in the “R Mode pin” section in this document.