ADP1048ARQZ-R7 datasheet(39/84 Pages) AD

39 / 84 page

Data Sheet

ADP1047/ADP1048

Rev. 0 | Page 39 of 84

WRITE OPERATION (BYTE WRITE AND BLOCK

WRITE)

Before performing a write to Page 2 through Page 15 of the

main block, the user must first unlock the EEPROM (see the

Unlock EEPROM section).

Write to Page 0 and Page 1

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 direct write operation to Page 0 or Page 1 using the

EEPROM_DATA_xx commands. If the user writes to Page 0,

Page 1 returns a no acknowledge. To program the register con-

tents of Page 1 of the main block, it is recommended that the

STORE_USER_ALL command be used (Command Code 0x15).

See the Save Register Settings to the User Scratch Pad section.

Write to Page 2 Through Page 15

The data in the EEPROM main block can be programmed

(written to) one byte at a time or in multiple bytes in series using

the EEPROM_DATA_xx commands (Command Code 0xB0 to

Command Code 0xBF). Before executing this command, the

user can program the offset from the page boundary where

the first byte is written using the EEPROM_ADDR_OFFSET

command (Register 0xD3).

If the targeted page has not yet been erased, the user can erase

the page as described in the Main Block Page Erase (Page 2 to

Page 15) section.

In the following example, four bytes are written to Page 9,

starting from the 256th byte of that page.

Set address offset = 256.

0x01

0x00

0xD3

SLAVE

ADDRESS

MASTER TO SLAVE

SLAVE TO MASTER

Write four bytes to Page 9.

BYTE COUNT =

0xB9

SLAVE

ADDRESS

MASTER TO SLAVE

SLAVE TO MASTER

...

DATA BYTE 1

DATA BYTE 4

Note that the block write command can write a maximum of

256 bytes for any single transaction.

EEPROM PASSWORD

On 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, and the EEPROM must first be unlocked to read these

pages.

Unlock 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 (Bit 6 of Register 0xFE81) is set to indicate

that the EEPROM is unlocked for write access.

Lock EEPROM

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

password using the EEPROM_PASSWORD command

(Register 0xD5). The EEPROM unlock flag is cleared to

indicate that the EEPROM is locked from write access.

Change EEPROM Password

To change the EEPROM password, the EEPROM must first be

unlocked. To change the EEPROM password, first write the

correct password using the EEPROM_PASSWORD command

(Register 0xD5). Immediately write the new password using the

EEPROM_PASSWORD command. The password is now

changed to the new password.

DOWNLOADING EEPROM SETTINGS TO INTERNAL

REGISTERS

Download User Settings to Registers

The user settings are stored in Page 1 of the EEPROM main

block. These settings are downloaded from the EEPROM into

the registers under the following conditions:

•

On power-up. The user settings are automatically down-

loaded into the internal registers, powering the part up in

a state previously saved by the user.

•

On execution of the RESTORE_USER_ALL command

(Command Code 0x16). This command allows the user

to force a download of the user settings from the EEPROM

main block, Page 1, into the internal registers.

Download Factory Settings to Registers

The factory default settings are stored in Page 0 of the EEPROM

main block. The factory settings can be downloaded from the

EEPROM into the internal registers using the RESTORE_

DEFAULT_ALL command (Command Code 0x12).

When this command is executed, the EEPROM password is also

reset to the factory default setting of 0xFF.

ADP1048ARQZ-R7 数据表(PDF) 39 Page - Analog Devices

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