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The user must know which I2C addresses are reserved in a system for special functions and set the address of the module to avoid

interfering with other system operations. Both 100kHz and 400kHz bus speeds are supported by the module. Connection for the

Power Management Bus interface should follow the High Power DC specifications given in section 3.1.3 in the SMBus specification

V2.0 for the 400kHz bus speed or the Low Power DC specifications in section 3.1.2. The complete SMBus specification is available

from the SMBus web site, smbus.org.

Table 4.

Figure 46. Circuit showing connection of resistors used to set the Power Management Bus address of the module.

The module can also be turned on and off via the Power Management Bus interface. The OPERATION command is used to actually

turn the module on and off via the Power Management Bus, while the ON_OFF_CONFIG command configures the combination of

analog ON/OFF pin input and Power Management Bus commands needed to turn the module on and off. Bit [7] in the OPERATION

command data byte enables the module, with the following functions:

0 : Output is disabled

1 : Output is enabled

This module uses the lower five bits of the ON_OFF_CONFIG data byte to set various ON/OFF options as follows:

BIT POSITION

4

3

2

1

0

ACCESS

r/w

r/w

r/w

r/w

r

FUNCTION

PU

CMD

CPR

POL

CPA

DEFAULT VALUE

1

0

1

1

1

PU: Sets the default to either operate any time input power is present or for the ON/OFF to be controlled by the analog ON/OFF input

and the Power Management Bus OPERATION command. This bit is used together with the CP, CMD and ON bits to determine

startup.

ADDR0

SIG_GND

ADDR1