LTP8800-4A

11

Rev. A

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PMBus COMMANDS AND LTPOWERPLAY

PMBus Commands

There are multiple PMBus commands and manufacturer

specific commands, which can be customized to adjust

APPLICATIONS INFORMATION

the settings of LTP8800-4A μModule, as listed in Table 1.

These commands comply to the PMBus Power System

Management Protocol. Users are encouraged to refer to

the PMBus Communication and Command Processing

section for details.

Table 1. LTP8800-4A Summary of Customizable Commands and Features

PMBus COMMAND

NAME, OR FEATURE

CMD CODE

REGISTER

COMMAND OR FEATURE

DESCRIPTION

TYPE

DATA

UNITS

DATA

FORMAT

NVM

ATTRIBUTES

WRITE_PROTECT

0x10

Protect the PMBus device against accidental writes.

R/W Byte

NA

Bit Field Stored in user-

editable NVM.

VIN_ON

0x35

Sets the value of the input voltage (VRMS) at which

the device starts power conversion.

R/W Word

Volts

Linear

11

Stored in user-

editable NVM.

VIN_OFF

0x36

Sets the value of the input voltage (VRMS) at which

the device stops power conversion.

R/W word

Volts

Linear

11

Stored in user-

editable NVM.

VIN_OV_FAULT_LIMIT

0x55

Sets the upper voltage threshold (in volts) measured

at the sense/input pin that causes an overvoltage

fault condition.

R/W Word

Volts

Linear

11

Stored in user-

editable NVM.

VIN_UV_FAULT_LIMIT

0x59

Sets the lower voltage threshold (in volts) measured

at the sense/input pin that causes an undervoltage

fault condition.

R/W Word

Volts

Linear

11

Stored in user-

editable NVM.

IIN_OC_FAULT_LIMIT

0x5B

Sets the threshold value (in amperes) measured at

the sense/input pin that causes an overcurrent fault

condition.

R/W Word

Amps

Linear

11

Stored in user-

editable NVM.

POUT_OP_FAULT_LIMIT

0x68

Sets the upper power threshold (in watts) measured

at the sense/output pin that causes an output

overpower fault condition.

R/W Word

Watts

Linear

11

Stored in user-

editable NVM.

NM_DIGFILT_LF_GAIN_SETTING

0xFE01

Determines the low frequency gain of the loop

response in normal mode.

R/W Byte

NA

NA

Stored in user-

editable NVM.

NM_DIGFILT_ZERO_SETTING

0xFE02

Determines the position of the final zero in

normal mode.

R/W Byte

NA

NA

Stored in user-

editable NVM.

NM_DIGFILT_POLE_SETTING

0xFE03

Determines the position of the final pole in

normal mode.

R/W Byte

NA

NA

Stored in user-

editable NVM.

NM_DIGFILT_HF_GAIN_SETTING

0xFE04

Determines the high frequency gain of the loop

response in normal mode.

R/W Byte

NA

NA

Stored in user-

editable NVM.