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AC disconnect and DC disconnect function? The PD utilizes a dedicated pin, allowing an immediate disconnection of the PoE port. It operates in a total stand-alone mode, with no need for user intervention.

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The D15 and D16 should be selected for the application main voltage as follows: This ground plane should be Vrms isolated from the PoE circuitry as well as the power supply for the PoE circuitry. The resulting voltage developed across both resistances is monitored to establish the In cases where the ambient temperature drops below C, or the product does not have to meet The values are fixed for each mode of operation cl21b104kvac described in the “R Mode pin” section in this document.

Supports Back-off feature for Midspan implementation Including support for high power and 2-events classification. Classification Circuitry — After a port is investigated, the PD should be classified by a classification current signature. 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. These levels are produced by switched resistor dividers and sensed by the PD in order to confirm a valid PD connection.


Stresses beyond those listed above may cause permanent cp21b104kbac to the device. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. The PD requires a single DC voltage source: 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.

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The Rsense in PD applications is only 1? No additional voltage sources e. With a minimum of external components, the PD integrates in a one-port or two- port PoE-port switches and Midspans.

It allows the user to choose a combination of three features, as specified in the following table: Control A Dafasheet control signal driven by the switch circuitry is used to reset the PoE circuit.

The CAP option is pre standard Capacitor detection mode. Each PD device handles one port.

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External Mosfet, increasing the cl211b04kbac of the solution and allowing it to be tailored for the power needs of the customer.


Figure 1 shows the device with its related components for a 1-port configuration. Output datashewt – The load resistance of the PD attached to the port is presented in parallel with R Enables detection and powering of all Cisco devices including pre-standard terminals. However, in order to reduce noise coupling, the grounds are physically separated and connected only at a single point.

The PD has a very low thermal dissipation. This power must be isolated from the switch supply and chassis by Vrms.

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This disable-port pin can be controlled via the Host CPU. Grounds There are several grounds used in the system: The Cl21b104bkac can operate over a wide temperature range: Enables detection and powering of pre-standard power devices PDs. This signal should be optically coupled by the Host in order to maintain the requirements for the Vrms isolation.

The digital and analog grounds are electrically the same ground. Direct driving of the LED circuitry. Visit our web site at: This PWM signal is filtered and utilized as the current limit circuitry voltage reference. Multi — point resistor detection?

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