DS2762 High-Precision Li+ Battery Monitor With Alerts

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Write Data [6Ch, XX]. This command writes data to the DS2762 starting at memory address XX. The LSb of the

data to be stored at address XX can be written immediately after the MSb of 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 DS2762 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

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 3. Function Commands

COMMAND

FUNCTION

COMMAND

PROTOCOL

BUS STATE AFTER

COMMAND PROTOCOL

BUS DATA

Read Data

Reads data from memory

starting at address XX

69h, XX

Master Rx

Up to 256 bytes of

data

Write Data

Writes data to memory

starting at address XX

6Ch, XX

Master Tx

Up to 256 bytes of

data

Copy Data

Copies shadow RAM data to

EEPROM block containing

address XX

48h, XX

Bus idle

None

Recall Data

Recalls EEPROM block

containing address XX to

shadow RAM

B8h, XX

Bus idle

None

Lock

Permanently locks the block

of EEPROM

containing address XX

6Ah, XX

Bus idle

None