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This signal should be optically coupled by the Host in order to maintain the requirements cl21b10k4bac the Vrms isolation. Multi — point resistor detection? Enables detection and powering of all Cisco devices including pre-standard terminals.

Exposure to absolute maximum rating conditions for extended periods may affect device reliability. It operates in a total stand-alone mode, with no need for user intervention.

The Rsense in PD applications is only 1? Enables detection and powering of pre-standard power devices PDs.

This power must be isolated from the switch supply and chassis by Vrms. Grounds There are dstasheet grounds used in the system: The digital and analog grounds are electrically the same ground.

This disable-port pin can be controlled dagasheet the Host CPU. 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. 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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Stresses beyond those listed above may cause permanent damage to the device. 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 PD utilizes a dedicated pin, allowing an immediate disconnection of the PoE port. The CAP option is pre standard Capacitor detection mode. No additional voltage sources e.

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

The values are fixed for each mode of operation and described in the “R Mode pin” section in this dqtasheet. Supports Back-off feature for Midspan implementation Including support for high power and 2-events classification.

The PD requires a single DC voltage source: 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.


This ground plane should be Vrms isolated from the PoE circuitry as well as the power supply for the PoE circuitry. Output port – The load resistance of the PD attached to the port is presented in parallel with R AC disconnect and DC disconnect function?


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.

CL21BKPFNNNC datasheet & applicatoin notes – Datasheet Archive

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: The resulting voltage developed across both resistances is monitored to establish the Figure 1 shows the device datasheef its related components for a 1-port configuration.

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: With a minimum of external components, the PD integrates in a one-port or two- port PoE-port switches and Midspans.

Each PD device handles one port. Visit our web site at: Direct driving of the LED circuitry. In cases where the ambient temperature drops below C, or the product does not have to meet

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