ADP1053ACPZ-R7 datasheet(38/84 Pages) AD

38 / 84 page

ADP1053

Data Sheet

Rev. A | Page 38 of 84

EEPROM

The ADP1053 has a built-in EEPROM controller that is used to

communicate with the embedded 8K × 8-byte EEPROM. The

EEPROM, also called Flash®/EE, is partitioned into two major

blocks: the INFO block and the main block. The INFO block

contains 128 8-bit bytes, and the main block contains 8K 8-bit

bytes. The main block is further partitioned into 16 pages, each

page containing 512 bytes.

FEATURES

The function of the EEPROM controller is to decode the

operation that is requested by the ADP1053 and to provide

the required 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 INFO 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 start-up 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

OVERVIEW

The EEPROM controller provides an interface between the

ADP1053 core logic and the built-in EEPROM. The user can

control data access to and from the EEPROM through this

controller interface. Separate 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

INFO Block Page Erase

The INFO block consists of 128 bytes organized as a single

page. The page erase operation to the INFO block erases (sets

high) all bits of the 128-byte page. The INFO block erase oper-

ation is part of a sequence of actions that occurs when the first

flag information is saved into the EEPROM. Essentially, the

page is first erased before the contents of the first flag registers

are written to the erased page. There is no separate command to

erase the INFO block.

Main Block Page Erase

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

to Page 0 or Page 1. Page 2 and Page 3 are reserved for internal

use, and their contents should not be erased.

Only Page 4 to Page 15 of the main block should 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.

Page 4 to Page 15 of the main block can be individually erased

using the EEPROM_PAGE_ERASE command (Command 0xD4).

For example, to perform a page erase of Page 10, execute the

following command:

ADATA BYTE

7-BIT SLAVE

ADDRESS

COMMAND

CODE

MASTER TO SLAVE

SLAVE TO MASTER

Figure 38. 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 high) for that byte to be writable.

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

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

READ OPERATION (BYTE READ AND BLOCK READ)

Read from INFO Block

The data in the EEPROM INFO block can be read one byte at

a time or in multiple bytes in series using the EEPROM_INFO

command (Command 0xF1). Before executing this command,

the user must program the number of bytes to read using the

EEPROM_NUM_RD_BYTES command (Command 0xD2). The

user can also program the offset from the page boundary where

the first read byte is returned using the EEPROM_ADDR_OFFSET

command (Command 0xD3).

In the following example, two bytes from the INFO block are

read, starting from the first byte of the page.

Set number of return bytes = 2.

A0x02

0xD2

7-BIT SLAVE

ADDRESS

MASTER TO SLAVE

SLAVE TO MASTER

Set address offset = 0.

0x00

0xD3

7-BIT SLAVE

ADDRESS

MASTER TO SLAVE

SLAVE TO MASTER

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