Datasheet

LTC2977
32
2977fa
For more information www.linear.com/LTC2977
Peek Operation using Mfr_data_plus0
Internal words and bytes may be read using Command Plus:
Write Mfr_command_plus_pointer=CMD_CODE with Mfr_command_plus_page=page and Mfr_command_plus_id=0.
The CMD_CODE’s are listed in the PMBus COMMAND SUMMARY table.
Read data from Mfr_data_plus0. Data is always read using a word read. Byte data is returned with the upper byte set to 0.
Enabling and Disabling Poke Operations
Poke operations to Mfr_data_plus0 are enabled by writing Mfr_command_plus = 0x0BF6.
Poke operations to Mfr_data_plus0 are disabled by writing Mfr_command_plus = 0x01F6.
Poke operations to Mfr_data_plus1 are enabled by writing Mfr_command_plus = 0x4BF6.
Poke operations to Mfr_data_plus1 are disabled by writing Mfr_command_plus = 0x41F6.
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.
Write Mfr_command_plus_pointer=CMD_CODE with Mfr_command_plus_page=page and Mfr_command_plus_id=0.
The CMD_CODE’s 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.
PMBus COMMAND DESCRIPTION