DS2751-025 データシートの表示（PDF） - Maxim Integrated

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DS2751-025

Multichemistry Battery Fuel Gauge

Maxim Integrated 

DS2751

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, tEEC, is 2ms typical and starts after the last

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

COMMAND

DESCRIPTION

COMMAND

PROTOCOL

Read Data

Reads data from memory

starting at address XX

69h, XX

Write Data

Copy Data

Recall Data

Lock

Writes data to memory

starting at address XX

Copies shadow RAM data

to EEPROM block

containing address XX

Recalls EEPROM block

containing address XX to

shadow RAM

Permanently locks the

block of EEPROM

containing address XX

6Ch, XX

48h, XX

B8h, XX

6Ah, XX

BUS STATE AFTER

COMMAND

PROTOCOL

Master Rx

Master Tx

Bus idle

Bus idle

Bus idle

BUS DATA

Up to 256

bytes of

data

Up to 256

bytes of

data

None

None

None

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