LTC2972 datasheet(36/112 Pages) LINER

36 / 112 page

LTC2972

2972fa

For more information www.linear.com/LTC2972

Poke Operation Using Mfr_data_plus0

Internal words and bytes may be written using Command Plus:

Enable poke access for Mfr_data_plus0. This need only be done once after a power-up or WDI reset.

WriteMfr_command_plus_pointer=CMD_CODEwithMfr_command_plus_page=pageandMfr_command_plus_id=0.

The CMD_CODEs are listed in the PMBus COMMAND SUMMARY table.

Write the new data value to MFR_DATA_PLUS0

Optionally check status to be sure data was written as desired:

• Write Mfr_command_plus_pointer = 0x2C with Mfr_command_plus_page = 0 and Mfr_command_plus_id = 0.

• Read data from Mfr_data_plus0 and confirm that Mfr_status_plus_poke_failed0 = 0.

Command Plus Operations Using MFR_DATA_PLUS1

All the previous operations may be accessed via Mfr_data_plus1 by substituting Mfr_command_plus_id value with

a 1. Poke operations must be enabled for Mfr_data_plus1.

ON/OFF CONTROL, MARGINING AND CONFIGURATION

COMMAND NAME

CMD

CODE DESCRIPTION

TYPE

PAGED FORMAT UNITS EEPROM

DEFAULT

VALUE

REF

PAGE

OPERATION

0x01 Operating mode control. On/Off, Margin

High and Margin Low.

R/W Byte

Reg

0x00

ON_OFF_CONFIG

0x02 CONTROL pin and PMBus on/off

command setting.

R/W Byte

Reg

0x12

MFR_CONFIG_LTC2972

0xD0 Configuration bits that are channel specific. R/W Word

Reg

0x0080

MFR_CONFIG2_LTC2972

0xD9 Configuration bits that are channel specific. R/W Byte

Reg

0x00

MFR_CONFIG3_LTC2972

0xDA Configuration bits that are channel specific. R/W Byte

Reg

0x00

MFR_CONFIG_ALL_LTC2972 0xD1 Configuration bits that are common to

both pages.

R/W Word

Reg

0x007B

PMBus COMMAND DESCRIPTION

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