ZSPM2000 datasheet(29/43 Pages) RENESAS

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ZSPM2000 Datasheet

January 27, 2016

4.7.

Detailed Description of the Supported PMBus™ Commands

4.7.1.

OPERATION Command

The OPERATION command is used to turn the unit on and off in conjunction with the input from the CONTROL

pin. The unit stays in the commanded operating mode until a subsequent OPERATION command or change in

the state of the CONTROL pin instructs the ZSPM2000 to change to another mode. The supported operation

modes are listed in Table 4.7.

Table 4.7

Supported PMBus™ Operation Modes

OPERATION (01HEX, read/write)

Bits[7:6]

Bits[5:4]

Bits[3:2]

Bits[1:0]

Unit

On or Off

Margin

State

Soft Off (With

Sequencing)

N/A

Off

4.7.2.

ON_OFF_CONFIG Command

The ON_OFF_CONFIG command is used to configure the combination of the CONTROL pin and PMBus™

OPERATION command that turns the unit on or off. The supported configuration options are listed in Table 4.8.

Table 4.8

Supported PMBus™ ON_OFF_CONFIG Options

ON_OFF_CONFIG (02HEX, read/write)

Bits

Name

Description

[0]

CONTROL OFF

Value ignored.

Device always uses the programmed turn off delay and fall time.

[1]

CONTROL Polarity

0: Active low (pull pin low to start the unit).

1: Active high (pull pin high to start the unit).

[2]

CONTROL Enable

0: Unit ignores the CONTROL pin.

1: Unit requires the CONTROL pin to be asserted to start the unit.*

[3]

OPERATION Enable

0: Unit ignores the on/off settings in the OPERATION command.

1: Unit requires the on/off settings in the OPERATION command to start the

unit*.

* Depending on the configuration, both conditions must be in the on state in order to turn on the unit.

4.7.3.

CLEAR_FAULTS Command

The CLEAR_FAULTS command is used to clear any fault bits that have been set in the status registers.

Additionally, the SMBALERT signal is cleared if it was previously asserted. Note that the device resumes opera-

tion with the currently configured state after a CLEAR_FAULTS command has been issued. If a fault/warning is

still present, the respective bit is set immediately again.

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