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ADP1052

Data Sheet

Rev. B | Page 50 of 113

EEPROM

The ADP1052 has a built-in EEPROM controller that communi-

cates with the embedded 8 kB (or 8192 bytes) 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 8192 8-bit bytes. The main block is further parti-

tioned 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 ADP1052 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

ADP1052 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.

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 following command, as shown in Figure 55.

DATA BYTE

7-BIT SLAVE

ADDRESS

COMMAND

CODE

MASTER TO SLAVE

SLAVE TO MASTER

Figure 55. 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 only if

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

READ OPERATION (BYTE READ AND BLOCK READ)

Read from Main Block, Page 0 and Page 1

Page 0 and Page 1 of the main block are reserved for storing the

default settings and the user settings, respectively, and are intended

to prevent third party access to this data. To read from Page 0 or

Page 1, the user must first unlock the EEPROM (see the Unlock

the EEPROM section). After the EEPROM is unlocked, Page 0 and

Page 1 are readable, using the EEPROM_DATA_xx commands

as described in the Read from Main Block, Page 2 to Page 15

section. Note that when the EEPROM is locked, a read from

Page 0 and Page 1 returns invalid data.

Read from Main Block, Page 2 to Page 15

Data in Page 2 to Page 15 of the main block is always readable,

even with the EEPROM locked. The data in the EEPROM main

block can be read one byte at a time or multiple bytes in series,

using the EEPROM_DATA_xx commands (Register 0xB0 to

Before executing this command, the user must program the

number of bytes to read, using the EEPROM_NUM_RD_BYTES

command (Register 0xD2). Also, the user can program the offset

from the page boundary where the first read byte is returned,

using the EEPROM_ADDR_OFFSET command (Register 0xD3).

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