PM8801 datasheet(12/37 Pages) STMICROELECTRONICS

部件名	PM8801

功能描述	High-efficiency, IEEE 802.3at compliant, integrated PoE-PD interface and PWM controller

PDF	37 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

12 / 37 page

Pin descriptions and connection diagram

PM8801

12/37

DocID018560 Rev 2

Delay time set.

A resistor connected from this pin to ARTN sets the delay time between GAT1 and

GAT2. This pin cannot be left open.

FRS

Switching frequency set.

An external resistor connected from FRS to ARTN sets the oscillator frequency.

T2P

Successful 2-event classification indicator.

T2P open-drain signal assertion happens when powered by a PSE performing a 2-

event classification. T2P is an active-low signal.

LED

Sleep mode LED indicator.

An LED connected to VSS is driven by a 250 Hz, 12 mA PWM current. The LED

brightness can be set through the DIM pin.

WKUP

Wake-up signal.

Closing the switch from WKUP to VSS, the PM8801 wakes up from sleep mode,

enabling the DC/DC controller with a soft-start. The WKUP is an active-low input.

Exposed Pad.

Connect this pad to a pcb copper plane to improve heat dissipation; must be

electrically connected to VSS.

Table 2. Pin descriptions (continued)

Pin#

Name

Function

PM8801 数据表(PDF) 12 Page - STMicroelectronics