ADP1052ACPZ-R7 datasheet(51/113 Pages) AD

51 / 113 page

Data Sheet

ADP1052

Rev. B | Page 51 of 113

In the following example, three bytes from Page 4 are read from

the EEPROM, starting from the sixth byte of that page.

1. Set number of return bytes = 3.

0x03

0xD2

7-BIT SLAVE

ADDRESS

MASTER TO SLAVE

SLAVE TO MASTER

Figure 56. Set the Return Bytes Number (= 3)

2. Set the address offset = 5.

0x00

0x05

0xD3

7-BIT SLAVE

ADDRESS

MASTER TO SLAVE

SLAVE TO MASTER

Figure 57. Set the Address Offset (= 5)

3. Read three bytes from Page 4.

0xB4

7-BIT SLAVE

ADDRESS

7-BIT SLAVE

ADDRESS

...

BYTE COUNT =

0x03

DATA BYTE

MASTER TO SLAVE

SLAVE TO MASTER

Figure 58. Read Three Bytes from Page 4

Note that the block read command can read a maximum of

256 bytes for any single transaction.

WRITE OPERATION (BYTE WRITE AND BLOCK

WRITE)

The user cannot write directly to the information block; this

block is used by the ADP1052 to store the first flag information

(see the First Flag ID Recording section).

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 the 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 contents

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

USER_ALL command be used (Register 0x15). See the Save

Write to Main Block, Page 2 to Page 15

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

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

Unlock the EEPROM section).

Data in Page 2 to Page 15 of the EEPROM main block can be

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

series, using the EEPROM_DATA_xx commands (Register 0xB0

to Register 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 Page Erase Operation section.

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

starting from the 257th byte of that page.

1. Set the address offset = 256.

0x01

0x00

0xD3

7-BIT SLAVE

ADDRESS

MASTER TO SLAVE

SLAVE TO MASTER

Figure 59. Set the Address Offset (= 256)

2. Write four bytes to Page 9.

BYTE COUNT = 4

0xB9

7-BIT SLAVE

ADDRESS

MASTER TO SLAVE

SLAVE TO MASTER

...

DATA BYTE 1

DATA BYTE 4

Figure 60. Write Four Bytes to Page 9

Note that the block write command can write a maximum of

256 bytes for any single transaction.

EEPROM PASSWORD

On ADP1052 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.

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