MP2886A datasheet(39/113 Pages) MPS

39 / 113 page

MP2886A – DIGITAL PWM CONTROLLER WITH PMBUS AND PWM-VID

MP2886A Rev. 1.0

www.MonolithicPower.com

1/21/2019

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

EE_WORD_WR_EN

Enable bit for writing and reading the EEPROM via the PMBus on Page 28/Page

29.

0: disable

1: enable

FAULT_SAVE_EN

Enable bit for auto-saving a fault status into the EEPROM.

0: disable

1: enable

CRC_PROTECT_EN

Enable bit for CRC fault protection.

0: EEPROM CRC fault does not stop the output power

1: EEPROM CRC fault stops the output power. The device enters shutdown mode.

In the process of storing memory data into the EEPROM, the device calculates the

CRC for all saved bits and saves the CRC result in the EEPROM. In the process

of restoring the EEPROM data to the memory, the device calculates the CRC for

all restored bits. At the end of the restore process, the device checks the CRC

results saved in the EEPROM with the calculated CRC. If they do not match, the

device reports a CRC fault and sets bit[4] of STATUS_ CML (7Eh).

WRITE_PROTECT (13h)

This register is used to enable EEPROM write protection.

Command

WRITE_PROTECT

Format

Unsigned binary

Bit

Access

r/w

Function

EEPROM write protection

Bits

Bit Name

Description

7:0

EEPROM_WP

Enable this bit for EEPROM write protection.

0x00: disable EEPROM write

0x63: enable EEPROM write

STORE_USER_ALL (15h)

The STORE_USER_ALL command instructs the PMBus device to copy the Page 0 contents of the

operating memory to the matching locations in the EEPROM. In the process, the device calculates the

CRC for all saved bits and saves the CRC result in the EEPROM.

This command is write only. There is no data byte for this command.

RESTORE_USER_ALL (16h)

The RESTORE_USER_ALL command instructs the PMBus device to copy the Page 0 contents from the

EEPROM and overwrite the matching locations in the operating memory. In this process, the device

calculates the CRC for all restored bits. If the calculated CRC does not match the CRC value saved in

the EEPROM, the device reports the CRC error via bit[4] of register STATUS_CML (7Eh). The CRC error

protection action is determined by bit[0] of MFR_EEPROM_CTRL (06h).

After the POR, the device triggers the memory copy operation from the EEPROM. This process is the

same as the operating RESTORE_USER_ALL command.

It is NOT permitted to send this command while the device is outputting power; otherwise, the command

will be ignored.

This command is write only. There is no data byte for this command.

MP2886A Datasheet(PDF) 39 Page - Monolithic Power Systems

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