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Dqtasheet 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. No additional voltage sources e. For a single port, the system worst case power dissipation can be calculated as follows.

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This power must be isolated from the switch supply and chassis by Vrms. These levels are produced by switched resistor dividers and sensed by the PD in order to confirm a valid PD connection. The CAP option is pre standard Capacitor detection mode. The Rsense in PD applications is only 1? Visit our web site at: Multi dstasheet point resistor detection?

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Datashert cases where the ambient temperature drops below C, or the product does not have to meet The PD requires a single DC voltage source: Output port – The load resistance of the PD attached to the port is presented in parallel with R The D15 and D16 should be selected for the application main voltage as follows: The digital and analog grounds are electrically the same ground.


With a minimum of external components, the PD integrates in a one-port or two- port PoE-port switches and Midspans. This signal should be optically coupled by the Host in order to maintain the requirements for the Vrms isolation.

AC disconnect and DC disconnect function?

Classification Circuitry — After a port is investigated, the PD should be classified by a classification current signature. External Mosfet, increasing the flexibility of the solution and allowing it to be tailored for the power needs of the customer. It allows the user to choose a combination of three features, as specified in the following table: Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

The resulting voltage developed across both resistances is monitored to establish the The values are fixed for each mode of operation and described in the “R Mode pin” section in this document.

This ground plane should be Vrms isolated from the PoE circuitry as well as the power supply for the PoE circuitry.

However, in order to reduce noise coupling, the grounds are physically separated and connected only at a single point. Direct driving of the LED circuitry. Each PD device handles one port. Stresses beyond those listed above may cause permanent damage to the device. The PD can operate over a wide temperature range: Enables detection and powering of all Cisco devices including pre-standard terminals. Supports Back-off feature for Midspan implementation Including support for high power and 2-events classification.


The PD has a very low thermal dissipation. The PD utilizes a dedicated pin, allowing an immediate disconnection of the PoE port. Grounds There are several grounds used in the system: Figure 1 shows the device with its related components for a 1-port configuration.

Enables detection and powering of pre-standard power devices PDs. Control A Reset control signal driven by the switch circuitry is used to reset the PoE circuit.

This disable-port pin can be controlled via the Host CPU. This PWM signal is filtered and utilized as the current limit circuitry voltage reference. Line Detection Circuitry — when performing a line detection procedure, the PoE device utilizes certain voltage levels over the output port. It operates in a total stand-alone mode, with no need for user intervention.