DS2782

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EEPROM REGISTER

The EEPROM register provides access control of the EEPROM blocks. EEPROM blocks can be locked to prevent

alteration of data within the block. Locking a block disables write access to the block. Once a block is locked, it

cannot be unlocked. Read access to EEPROM blocks is unaffected by the lock/unlock status.

Figure 21. EEPROM Register Format

ADDRESS

1Fh

BIT DEFINITION

FIELD

BIT

FORMAT

ALLOWABLE VALUES

EEC

7

Read Only

EEPROM Copy Flag

Set to 1 when: Copy Data command executed

Cleared to 0 when: Copy Data command completes

Note: While EEC = 1, writes to EEPROM addresses are ignored

Power-up default: 0

LOCK

6

Read /

Write to 1

EEPROM Lock Enable

Host write to 1: Enables the Lock command. Host must issue Lock

command as next command after writing Lock Enable bit to 1.

Cleared to 0 when: Lock command completes or when Lock command

not the command issued immediately following the Write command

used to set the Lock Enable bit.

Power-up default: 0

Reserved

2:6

Undefined

BL1

1

Read Only

EEPROM Block 1 Lock Flag (Parameter EEPROM 60h – 7Fh)

0: EEPROM is not locked

1: EEPROM block is locked

Factory default: 0

BL0

0

Read Only

EEPROM Block 0 Lock Flag (User EEPROM 20h – 2Fh)

0: EEPROM is not locked

1: EEPROM block is locked

Factory default: 0

PROGRAMMABLE SLAVE ADDRESS

The 2-Wire slave address of the DS2782 is stored in the parameter EEPROM block, address 7Eh. Programming

the slave address requires a write to set the SAWE (Slave Address Write Enable) bit in the Special Features

register, followed by a write to 7Eh with the desired slave address. The new slave address value is effective

following the write to 7Eh, and must be used to address the DS2782 on subsequent bus transactions. The slave

address value is not stored to EEPROM until a Copy EEPROM block 1 command is executed. Prior to executing

the Copy command, power cycling the DS2782 restores the original slave address value. The data format of the

slave address value in address 7Eh is shown in Figure 22. When not writing the slave address, the SAWE bit

should be written to a 0.

Figure 22. Slave Address Format

ADDRESS 7Eh

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

A6

A5

A4

A3

A2

A1

A0

X

A6-A0:

Slave Address. A6-A0 contains the 7-bit slave address of the DS2782. The factory default is 0110100b.

X:

Reserved Bits.