DS2777 MAXIM [Maxim Integrated Products], DS2777 Datasheet - Page 29

• Manufacturer Part Number: DS2777
• Description: 2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with Protector and Optional SHA-1 Authentication
• Manufacturer: MAXIM [Maxim Integrated Products]

2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with
Protector and Optional SHA-1 Authentication
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 can-
not be unlocked. Read access to EEPROM blocks is unaffected by the lock/unlock status.
EEPROM Register Format (1Fh)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
EEC
LOCK
X
X
X
X
BL1
BL0
Bit 7: EEPROM Copy Flag (EEC). A 1 in this read-only bit indicates that a Copy Data Function command is in
progress. While this bit is high, writes to EEPROM addresses are ignored. A 0 value in this bit indicates that data can
be written to unlocked EEPROM.
Bit 6: EEPROM Lock Enable (LOCK). When the LOCK bit is 0, the Lock Function command is ignored. Writing a 1
to this bit enables the Lock Function command. After setting the LOCK bit, the Lock Function command must be
issued as the next command, else the LOCK bit is reset to 0. After the lock operation is completed, the LOCK bit is
reset to 0. The LOCK bit is a volatile R/W bit, initialized to 0 upon POR.
Bits 5 to 2: Reserved.
Bit 1: Parameter EEPROM Block 1 Lock Flag (BL1). A 1 in this read-only bit indicates that EEPROM block 1
(addresses 60h to 7Fh) is locked (read-only), while a 0 indicates block 1 is unlocked (read/write).
Bit 0: User EEPROM Block 0 Lock Flag (BL0). A 1 in this read-only bit indicates that EEPROM block 0 (addresses
20h to 2Fh is locked (read-only), while a 0 indicates block 0 is unlocked (read/write).
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