ADP1046AACPZ-R7 datasheet(42/88 Pages) AD

42 / 88 page

ADP1046A

Data Sheet

Rev. 0 | Page 42 of 88

WRITE OPERATION (BYTE WRITE AND BLOCK

WRITE)

Write to Main Block, 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_00 and EEPROM_DATA_01 commands. A

user write to Page 0 or Page 1 returns a no acknowledge. To

program the register contents of Page 1 of the main block, it is

recommended that the STORE_USER_ALL command be used

(Register 0x82). See the Save Register Settings to User Settings

section.

Write to Main Block, Page 2 and Page 3

Page 2 and Page 3 of the main block are reserved for internal

use and their contents should not be written to. Only Page 4

to Page 15 should be used to store data.

Write to Main Block, Page 4 to Page 15

Before performing a write to Page 4 through Page 15 of the

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

Unlock the EEPROM section).

Data in Page 4 to Page 15 of 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 (Register 0x8B

to Register 0x9A). 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 0x85).

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

the page as described in the Page Erase Operation section.

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

starting from the 256th byte of that page.

1. Set address offset = 256.

7-BIT

SLAVE

ADDRESS

W A

0x01

A P

0x85

0x00

= MASTER-TO-SLAVE

= SLAVE-TO-MASTER

2. Write four bytes to Page 9.

7-BIT

SLAVE

ADDRESS

BYTE

COUNT = 4

0x94

DATA BYTE 1

DATA BYTE 4

...

= MASTER-TO-SLAVE

= SLAVE-TO-MASTER

Note that the block write command can write a maximum

of 256 bytes for any single transaction (set the byte count = 0).

EEPROM PASSWORD

On power-up, the EEPROM is locked and protected from

accidental writes or erases. Only reads from Page 2 to Page 15

of the main block 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.

Unlock the EEPROM

To unlock the EEPROM, perform two consecutive writes

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

PASSWORD command (Register 0x88). The EEPROM unlocked

flag (Bit 0 of Register 0x03) 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 pass-

word using the EEPROM_PASSWORD command (Register 0x88).

The EEPROM unlocked flag (Bit 0 of Register 0x03) 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 0x88).

Immediately write the new password using the same 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

(Register 0x83). This command allows the user to force a

download of the user settings from Page 1 of the EEPROM

main block into the internal registers.

Download Factory Default Settings to Registers

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

main block. The factory default settings can be downloaded from

the EEPROM into the internal registers using the RESTORE_

DEFAULT_ALL command (Register 0x81).

When this command is executed, the EEPROM password is also

reset to the factory default setting of 0xFF.

ADP1046AACPZ-R7 数据表(PDF) 42 Page - Analog Devices

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