Datasheet

DS2775/DS2776/DS2777/DS2778
2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with
Protector and Optional SHA-1 Authentication
______________________________________________________________________________________ 45
FUNCTION
COMMAND
TARGET
EEPROM
BLOCK
FCmd
VALUE
DESCRIPTION
0 42h
Copy Data
1 44h
This command copies the shadow RAM to the target EEPROM block. Copy data
commands that target locked blocks are ignored. While the Copy Data command is
executing, the EEC bit in the EEPROM register is set to 1, and write data commands
with MAddr set to any address within the target block are ignored. Read data and
write data commands with MAddr set outside the target block are processed while
the copy is in progress. The Copy Data command execution time, t
EEC
, is 2ms
typical and starts after the FCmd byte is acknowledged. Subsequent copy or lock
commands must be delayed until the EEPROM programming cycle completes.
0 B2h
Recall Data
1 B4h
This command recalls the contents of the targeted EEPROM block to its shadow
RAM.
0 63h
Lock
1 66h
This command locks (write protects) the targeted EEPROM block. The LOCK bit in
the EEPROM register must be set to 1 before the Lock command is executed. If the
LOCK bit is 0, the Lock command has no effect. The Lock command is permanent;
a locked block can never be written again. The Lock command execution time,
t
EEC
, is 2ms typical and starts after the FCmd byte is acknowledged. Subsequent
copy or lock commands must be delayed until the EEPROM programming cycle
completes.
Read ROM
ID
— 39h
This command initiates a read of the unique 64-bit ROM ID. After the Read ROM ID
command is sent, the ROM ID can be read with the following sequence:
S SAddr R Data0 A Data1 A ... Data7 N P.
Table 15. Function Commands
Selector Guide
PART INTERFACE SHA-1
DS2775G+ 1-Wire No
DS2775G+T&R 1-Wire No
DS2776G+ 1-Wire Yes
DS2776G+T&R 1-Wire Yes
DS2777G+ 2-Wire No
DS2777G+T&R 2-Wire No
DS2778G+ 2-Wire Yes
DS2778G+T&R 2-Wire Yes
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
14 TDFN-EP T1435N+1
21-0253 90-0246
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maxim-ic.com/packages
. Note that a
“+”, “#”, or “-” in the package code indicates RoHS status only.
Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.