ADP1050ACPZ-R7 datasheet(43/93 Pages) AD

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ADP1050

Data Sheet

EEPROM

The ADP1050 has a built-in EEPROM controller that is used

to communicate with the embedded 8000-byte EEPROM.

The EEPROM, also called Flash/EE, is partitioned into two

major blocks: the information block and the main block. The

information block contains 128 8-bit bytes (for internal use only),

and the main block contains 8000 8-bit bytes. The main block

is further partitioned into 16 pages, with each page containing

512 bytes.

EEPROM FEATURES

The function of the EEPROM controller is to decode the operation

that is requested by the ADP1050 and to provide the necessary

timing to the EEPROM interface. Data is written to or read

from the EEPROM, as requested by the decoded command.

Features of the EEPROM controller include

•

Separate page erase functions for each page in the

EEPROM

•

Single byte and multibyte (block) read of the information

block with up to 128 bytes at a time

•

Single byte and multibyte (block) write and read of the

main block with up to 256 bytes at a time

•

Automatic upload on startup, from the user settings to the

internal registers

•

Separate commands to upload and download data, from

the factory default or user settings to the internal registers

EEPROM OVERVIEW

The EEPROM controller provides an interface between the

ADP1050 core logic and the built-in EEPROM. The user can

control data access to and from the EEPROM through this

controller interface. Different PMBus commands are available

for the read, write, and erase operations to the EEPROM.

Communication is initiated by the master device sending a

command to the PMBus slave device to access data from or

send data to the EEPROM. Read, write, and erase commands

are supported. Data is transferred between devices in a byte

wide format. Using a read command, data is received from the

EEPROM and transmitted to the master device. Using a write

command, data is received from the master device and stored in

the EEPROM through the EEPROM controller.

EEPROM PASSWORD

On ADP1050 VDD power-up, the EEPROM is locked and

protected from accidental writes or erases. Only reads from

Page 2 to Page 15 are allowed when the EEPROM is locked.

Before any data can be written (programmed) to the EEPROM,

the EEPROM must be unlocked for write access. After it is

unlocked, the EEPROM is opened for reading, writing, and

erasing.

On power-up, Page 0 and Page 1 are also protected from read

access. The EEPROM must first be unlocked to read these pages.

Unlock the EEPROM

To unlock the EEPROM, perform two consecutive writes

with the correct password (default = 0xFF), using the

EEPROM_PASSWORD command (Register 0xD5). The

EEPROM_UNLOCKED flag (Register 0xFEA2[3]) is set to

indicate that the EEPROM is unlocked for write access.

Lock the EEPROM

To lock the EEPROM, write any byte other than the correct

password, using the EEPROM_PASSWORD command

(Register 0xD5). The EEPROM_UNLOCKED flag is cleared

to indicate that the EEPROM is locked from write access.

Change the EEPROM Password

To change the EEPROM password, first write the correct password,

using the EEPROM_PASSWORD command (Register 0xD5).

Immediately write the new password, using the same command.

The password is now changed to the new password.

PAGE ERASE OPERATION

The main block consists of 16 equivalent pages of 512 bytes

each, numbered Page 0 to Page 15. Page 0 and Page 1 of the

main block are reserved for storing the default settings and user

settings, respectively. The user cannot perform a page erase

operation on Page 0 or Page 1. Page 3 is reserved for storing the

power board parameters for the GUI.

Only Page 4 to Page 15 of the main block can be used to store

data. To erase any page from Page 4 to Page 15, the EEPROM

must first be unlocked for access. For instructions on how to

unlock the EEPROM, see the Unlock the EEPROM section.

Each page of the main block, from Page 4 to Page 15, can be

individually erased using the EEPROM_PAGE_ERASE command

(Register 0xD4). For example, to perform a page erase of Page 10,

execute the command shown in Figure 46.

DATA BYTE

7-BIT SLAVE

ADDRESS

COMMAND

CODE

MASTER TO SLAVE

SLAVE TO MASTER

Figure 46. Example Erase Command

In this example, command code = 0xD4 and data byte = 0x0A.

Note that it is important to wait at least 35 ms for the page erase

operation to complete before executing the next PMBus command.

The EEPROM allows erasing of whole pages only; therefore, to

change the data of any single byte in a page, the entire page must

first be erased (set to logic high) for that byte to be writeable.

Subsequent writes to any bytes in that page are allowed as long

as that byte has not been previously written to a logic low.

Rev. A | Page 42 of 92

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