DS2751+ MAXIM [Maxim Integrated Products], DS2751+ Datasheet - Page 16

• Manufacturer Part Number: DS2751+
• Description: Multichemistry Fuel Garge
• Manufacturer: MAXIM [Maxim Integrated Products]

Write Data [6Ch, XX]. This command writes data to the DS2751 starting at memory address XX. The
LSb of the data to be stored at address XX can be written immediately after the MSb of the address has
been entered. Because the address is automatically incremented after the MSb of each byte is written, the
LSb to be stored at address XX + 1 can be written immediately after the MSb to be stored at address XX.
If the bus master continues to write beyond address FFh, the DS2751 ignores the data. Writes to read-
only addresses, reserved addresses and locked EEPROM blocks are ignored. Incomplete bytes are not
written. Writes to unlocked EEPROM blocks are to shadow RAM rather than EEPROM. See the Memory
section for more details.
Copy Data [48h, XX]. This command copies the contents of shadow RAM to EEPROM for the 16-byte
EEPROM block containing address XX. Copy Data commands that address locked blocks are ignored.
While the Copy Data command is executing, the EEC bit in the EEPROM Register is set to 1 and writes
to EEPROM addresses are ignored. Reads and writes to non-EEPROM addresses can still occur while the
copy is in progress. The Copy Data command execution time, t
address bit is transmitted.
Recall Data [B8h, XX]. This command recalls the contents of the 16-byte EEPROM block containing
address XX to shadow RAM.
Lock [6Ah, XX]. This command locks (write-protects) the 16-byte block of EEPROM memory
containing memory address XX. The LOCK bit in the EEPROM Register must be set to l 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.
Table 4. FUNCTION COMMANDS
Read Data
Write Data
Copy Data
Recall Data
Lock
COMMAND
Copies shadow RAM data
Reads data from memory
containing address XX to
Recalls EEPROM block
Writes data to memory
containing address XX
containing address XX
starting at address XX
starting at address XX
Permanently locks the
to EEPROM block
block of EEPROM
DESCRIPTION
shadow RAM
PROTOCOL
COMMAND
16 of 19
6Ah, XX
6Ch, XX
B8h, XX
69h, XX
48h, XX
EEC
BUS STATE AFTER
, is 2ms typical and starts after the last
PROTOCOL
COMMAND
Master Rx
Master Tx
Bus idle
Bus idle
Bus idle
BUS DATA
Up to 256
Up to 256
bytes of
bytes of
None
None
None
data
data