4-Port PoE Manager

Microsemi Proprietary and Confidential. PD69104B1/F Datasheet Revision 2.0

29

The following illustration shows the read transaction format.

Figure 18 • I2C EEPROM High-Level Packet Structure

For more information on the I²C timing constraint, see Table 3 (see page 9)

The EEPROM registers mapping should be identical to the PD69104B1/F registers mapping.

Note: In EEPROM mode, only I²C (not UART) will be used by PD69104B1/F for communication with the

host (after finishing the configuration upload from EEPROM).

The following table lists the LED indications.

Table 22 • LED Indications

Pin

Status

LED

LED<3:0>

Port power on

On

Power management event

0.4 Hz blink

Port over load

Port short circuit

Port failed at startup

0.8 Hz blink

Vmain_Out of range

or over temp

All LEDs :3.3 Hz blink

Port pff

Off

MAX_LED

Total power consumption is below power guard band determined by the user

Off

Total power consumption is above power guard band but below total budget.

On

Total power consumption is above total budget, or Power Integral is still positive

Blink

MAX_LED:

Both max power budget and max LED guard band (GB) can be configured through internal registers:

Max power budget registers: PWR_BNK0 to PWR_BNK7 (address 0x89 to 0x90)

Max LED guard band register: PoE_MAX_LED_GB (address 0x9F)

PoE_MAX_LED_GB Register LSB = 1 W

Max LED reflects total power for all 4 ports

When total power consumption < (Max Power—Guard Band) > Max LED is OFF (below the bottom

line)

When total power consumption > (Max Power—Guard Band) > Max LED is ON (between the lines)

When total power consumption > (Max Power) > LED is BLINKING (above top line)

Also, when total power > budget (above top line):