PM8805 datasheet(6/45 Pages) STMICROELECTRONICS

No. de pieza	PM8805

Descripción Electrónicos	IEEE 802.3bt PoE-PD interface with embedded dual active bridge

PDF	45 Pages

Scroll/Zoom	100%

Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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6 / 45 page

Pin description and connection diagram

PM8805

6/45

DS12813 Rev 1

Pin description and connection diagram

Figure 3. Pin connections (top view)

Table 2. Pin description

Pin#

Name

Function

1, 40, 41

IN78

Input for the signals connected to "Spare" pairs. This signal along

with IN45 signals is used to feed the 2nd internal bridge.

2VB

Internal reference voltage 5V up to 10mA; filter this pin with a

ceramic capacitor of 100nF typ. connected to AGND.

This voltage can be used to bias the I/O pins of PM8805, if needed.

STBY

A high level applied to this pin activates an internal 10 / 18mA

current source to implement the MPS feature.

Duty cycle is Long (.af /.at) or Short (.bt) depending on the detected

PSE: Type 2, or Type 3 and 4.

Use a resistor voltage divider to AGND to connect this 5V voltage

rating pin: typical value for the threshold is 1.25V.

If higher than 0.5V during first classification finger, Autoclass feature

is enabled.

Connect this pin to AGND if not used.

CLS1

Classification resistor pin for first and second Class Events.

Connect a 0805 classification programming resistor from this pin to

AGND.

The external resistor is activated with a 3.3ms typ. delay with

respect to the classification event.

PM8805 Datasheet(PDF) 6 Page - STMicroelectronics