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NCP81040

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Table 10. I2C Commands for the NCP81040

Cmd

Code

R/W

Default

Description

Bytes

Comment

0x01

R/W

0x80

Operation

00xx xxxx – Immediate Off

01xx xxxx – Soft Off

1000 xxxx – On (slew rate set by soft−start) − Default

1001 10xx – Margin Low (Act on Fault)

1010 10xx – Margin High (Act on Fault)

0x02

R/W

0x17

ON_OFF_Config

Configures how the controller is turned on and off.

Bit

Default

Comment

7:5

000

Reserved for Future Use

This bit is read only. Switching starts when

commanded by the Control Pin and the

Operation Command, as set in Bits 3:0.

0: Unit ignores OPERATION commands over

the I2C interface

1: Unit responds to OPERATION command,

powerup may also depend upon Control input,

as described in Bit 2

0: Unit ignores EN pin

1: Unit responds EN pin, powerup may also

depend upon the Operation Register, as

described for Bit 3

Control Pin polarity

0 = Active Low

1 = Active High

This bit is read only.

1: means that when the controller is disabled it

will either immediately turn off or soft off (as set

in the Operation Command)

0x03

Clear_Faults

Writing any value to this command code will clear all Status Bits

immediately. The SMBus ALERT is deasserted on this command. If

the fault is still present the fault bit shall immediately be asserted

again.

0x10

R/W

0x00

Write Protect

The Write_Protect command is used to control writing to the I2C

device. There is also a lock bit in the Manufacture Specific Registers

that once set will disable writes to all commands until the power to the

NCP81040 is cycled.

Data Byte

Comment

1000 0000

Disables all writes except to the Write_Protect

Command

0100 0000

Disables all writes except to the Write_Protect

and Operation Commands

0010 0000

Disables all writes except to the Write_Protect,

Operation, ON_OFF_Config and

VOUT_COMMAND Commands

0000 0000

Enables writes to all commands

0001 0000

Disables all writes except to

WRITE_PROTECT, PAGE and all

MFR−SPECIFIC Commands

0x19

0xB0

Capability

This command allows the host to get some information on the I2C

device.

Bit

Default

Comment

PEC (Packet Error Checking is supported)

6:5

Max supported bus speed is 400 kHz

NCP81040 has an SMBus ALERT pin and ARA

is supported

3:0

000

Reserved for future use

0x20

VOUT_MODE

The NCP81040 supports VID mode for programming the output

voltage.

0x21

R/W

0x00

VOUT_COMMAND

Sets the output voltage using VID.

0x25

R/W

0x0020

VOUT_MARGIN_HIGH

Sets the output voltage when operation command is set to Margin

High. Programmed in VID Mode.

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