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Visit our web site at: It allows the user to choose a combination of three features, as specified datashwet the following table: The resulting voltage developed across both resistances is monitored to establish the Control A Reset control signal driven by the switch circuitry is used to reset the PoE circuit.

For a single port, the system worst case power dissipation can be calculated as follows. Line Detection Circuitry — when performing a line detection procedure, the PoE device utilizes certain voltage levels over the output port. The PD has a very low thermal dissipation.

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This disable-port pin can be controlled via the Host CPU. Classification Circuitry — After a port is investigated, the PD should be classified by a classification current signature. With a minimum of external components, the PD integrates in a one-port or two- port PoE-port switches and Midspans.


The Rsense in PD applications is only 1?

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This ground plane should be Vrms isolated from the PoE circuitry as well as the power supply for the PoE circuitry. In cases where the ambient temperature drops below C, or the product does not have to meet Multi — point resistor detection?

Enables detection and powering of pre-standard power devices PDs. This signal should be optically coupled by the Host in order to maintain the lc21b104kbac for the Vrms isolation. The values are fixed for each mode of operation and described in the datashest Mode pin” section in this document.

Direct driving of the LED circuitry.

Output port – The load resistance of the PD attached to the port is presented in parallel with R Figure 1 shows the device with its related components for a 1-port configuration. Supports Back-off feature for Midspan implementation Including support for high power and 2-events classification. 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.

The PD utilizes a dedicated pin, allowing an immediate disconnection of the PoE cl221b104kbac. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. These levels are produced by switched resistor dividers and sensed by the PD in order to confirm a valid PD connection.


The PD can operate over a wide temperature range: This power must be isolated from cl21b104jbac switch supply and chassis by Vrms. The PD requires a single DC voltage source: However, in order to reduce noise coupling, the grounds are physically separated and connected only at a single point. The D15 and D16 should be selected for the application main voltage as follows: The digital and analog grounds are electrically the same ground.

AC disconnect and DC disconnect function? Each PD device handles one port. Grounds There are several grounds used in the system: Enables detection and powering of all Cisco devices including pre-standard terminals.


It operates in a total stand-alone mode, with no need for user intervention. The CAP option is pre standard Capacitor detection mode. External Mosfet, increasing the cl21b104,bac of the solution and allowing it to be tailored for the power needs of the customer. No additional voltage sources e. Stresses beyond those listed above may cause permanent damage to the device. This PWM signal is filtered and utilized as the current limit circuitry voltage reference.