PD64012

12-CHANNEL PoE MANAGER

Automatic mode – in this mode the PD64012 PoE

Managers communicate with the host CPU, through

an isolated I

dedicated

for

internal

communication

among

PD64012s (for power management), as illustrated in

Figure 4.

HOST

CPU

SDA

SCL

SDA

SCL

SDA

SCL

SDA

SCL

SDA

SCL

Input Opto

I/O Opto

PD64012

#00

PD64012

#01

PD64012

#10

PD64012

#11

Master

Slave

Slave

Slave

SPI BUS

MOSI

MISO

MOSI

MISO

MOSI

MISO

MOSI

MISO

SCK

SCK

SCK

SCK

CS[0:1]_N

Anyone of the devices (for example, PD64012 #00)

may be configured as Master, while the others are

Slaves. This Master/Slave configuration only affects

the Serial Peripheral Interface (SPI) bus. It is critical

that only one of them be set-up as a Master, with the

others acting as Slaves, in order to avoid SPI clock

and data I/Os contentions.

Figure 4: Automatic Mode

Mode Configuration Method

The PoE Manager’s configuration is done via the ASIC_INI pin, according to the following table.

The ASIC_INI analog signal is converted into a 10-bit register (A/D). Once a hard Reset pulse is detected, the data

is latched into an internal mode register.

MODE NAME

ASIC_INI

VOLTAGE LEVEL

ASIC_INI INTERNAL A/D

REGISTER

I

(set internally)

Enhanced mode

0.31 to 0.63 V

001

00

Auto mode – Slave 1

0.63 to 0.94 V

010

01

Auto mode – Slave 2

0.94 to 1.25 V

011

10

Auto mode – Slave 3

1.25 to 1.56 V

100

11

Auto mode - Master

2.19 to 2.5 V

111

00

Notes:

In the Auto mode – the PD64012 is communicating with the host via I

In the Enhanced mode – the PD64012 is communicating with the controller via SPI.

The PD64002 PoE Manager complies with all requirements of IEEE standard 802.3af-2003, for detection. The

device has been designed around two major sections:

1.

A common Digital section, that serves all 12 channels

2.

Twelve separate and identical channels for driving ports.

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© PowerDsine 2003

Information in this document subject

06-0003-058 (Rev. 2.8) / 5 August 2004

to change without prior notice.

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