3.1

CURRENT_SET and AF/AT

The following table lists the pins that determine the typical PD load output current.

Table 3-2. CURRENT_SET and AF/AT Pins

AT/AF Pin

Current_Set Pin

[mA]

IEEE 802.3

0

0

350

425

AF mode (standard)

1

0

600

722

AT mode (standard)

1

1

720

874

AT mode (high

power)

0

1

1000

1200

AT mode (extra high

power)

3.2

Mode of Operation Coding

The following table lists the mode of operation coding options related to pins 21 and 22.

Table 3-3. Configuration Coding

Mode 0

Mode 1

Mode

Description

0

0

Normal operation mode

Standard operation PoE

mode.

LED0 and LED1 outputs

are used for direct LED

drive as described in the

following section.

0

1

Serial monitoring mode

Standard operation PoE

mode.

LED0 and LED1 are used

to continuously stream out

internal logic signals for

PoE monitoring.

1

0

Test mode

Internal IC test mode; used

in production only.

1

1

Test mode

Internal IC test mode; used

in production only.

3.3

LED I/Os Behavior

The following tables list the LED I/Os behavior related to pins 13 and 14 in 2-pair application. In both application

types, the LED pin is a high-voltage, open-drain, output pin, and an active low (sink) pin. That is, LED is “ON” when

the I/O is pulled low.

Table 3-4. 2-Pair Behavior

Status Indications

LED0 LED1 Notes

AF mode—port ON

ON

OFF

Useful for bi-color LED connected from LED0 to

LED1.

PD69101

Pin Descriptions

and its subsidiaries

Datasheet

DS00004280A-page 18