ISL8274MEVAL1Z datasheet(70/81 Pages) RENESAS

70 / 81 page

FN8931 Rev.1.00

Page 70 of 81

Jan 4, 2018

ISL8274M

7. PMBus Commands Description

BLANK_PARAMS (EBh)

Definition: Returns a 16-byte string indicating which parameter values were either retrieved by the last RESTORE

operation or have been written since that time. Reading BLANK_PARAMS immediately after a restore operation

allows the user to determine which parameters are stored in that store. A “1” indicates the parameter is not present in

the store and has not been written since the RESTORE operation.

Data Length in Bytes: 16

Data Format: BIT

Type: Block Read

Default Value: FF…FFh

SNAPSHOT_CONTROL (F3h)

Definition: Writing a 01h will cause the device to copy the current Snapshot values from NVRAM to the 32-byte

Snapshot command parameter. Writing a 02h will cause the device to write the current Snapshot values to NVRAM.

Writing a 03h will erase all Snapshot values from NVRAM. Write (02h) and Erase (03h) may only be used when the

device is disabled. All other values will be ignored.

Data Length in Bytes: 1

Data Format: Bit field

Type: R/W byte

RESTORE_FACTORY (F4h)

Definition: Restores the device to the hard coded factory default values and pin-strap definitions. The device retains

the DEFAULT and USER stores for restoring. Security level is changed to Level 1 following this command.

Data Length in Bytes: 0

Data Format: N/A

Type: Send byte

Default Value: N/A

Units: N/A

MFR_VMON_OV_FAULT_LIMIT (F5h)

Definition: Reads the VMON OV fault threshold.

Data Length in Bytes: 2

Data Format: L11

Type: Read only

Default Value: CB00h (6V)

Units: V

Range: 4V to 6V

Value

Description

01h

Read Snapshot values from NV RAM

02h

Write Snapshot values to NV RAM

03h

Erase Snapshot values stored in NV RAM.

ISL8274MEVAL1Z Datasheet(PDF) 70 Page - Renesas Technology Corp

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