MAX6874 データシートの表示（PDF） - Maxim Integrated

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MAX6874

EEPROM-Programmable, Hex/Quad, Power-Supply Sequencers/Supervisors

Maxim Integrated 

EEPROM-Programmable, Hex/Quad,

Power-Supply Sequencers/Supervisors

SEND BYTE FORMAT

WRITE WORD FORMAT

S ADDRESS WR ACK DATA ACK P

S ADDRESS WR ACK COMMAND ACK DATA ACK DATA ACK P

7 bits

0

Slave Address–

equivalent to chip-

select line of a 3-

wire interface.

8 bits

Data Byte–presets the

internal address pointer.

RECEIVE BYTE FORMAT

7 bits

0

Slave Address–

equivalent to chip-

select line of a 3-

wire interface.

WRITE BYTE FORMAT

8 bits

Command Byte–

MSB of the

EEPROM

register being

written.

8 bits

8 bits

Data Byte–first byte is the LSB of

the EEPROM address. Second

byte is the actual data.

S ADDRESS WR ACK DATA ACK P

S ADDRESS WR ACK COMMAND ACK DATA ACK P

7 bits

1

8 bits

7 bits

0

8 bits

8 bits

Slave Address–

equivalent to chip-

select line of a 3-

wire interface.

Data Byte–reads data from

the register commanded by

the last read byte or write

byte transmission. Also

dependent on a send byte.

BLOCK WRITE FORMAT

Slave Address–

equivalent to chip-

select line of a 3-

wire interface.

Command Byte–

selects register

being written.

Data Byte–data goes into the

register set by the command

byte if the command is below

50h. If the command is 80h,

81h, or 82h, the data byte

presets the LSB of an EEPROM

address.

S

ADDRESS

WR

ACK COMMAND ACK

BYTE

COUNT= N

ACK

DATA BYTE

1

ACK

DATA BYTE

...

ACK

DATA BYTE

N

ACK

P

7 bits

0

83h

8 bits

8 bits

8 bits

8 bits

Slave Address–

equivalent to chip-

select line of a 3-

wire interface.

Command Byte–

prepares device

for block

operation.

Data Byte–data goes into the register set by the

command byte.

BLOCK READ FORMAT

S ADDRESS WR ACK COMMAND ACK SR ADDRESS WR

ACK

BYTE

COUNT= 16

ACK

DATA BYTE

1

ACK

DATA BYTE

...

ACK

DATA BYTE

N

ACK

P

7 bits 0

84h

7 bits

1

10h

8 bits

8 bits

8 bits

Slave Address–

equivalent to chip-

select line of a 3-

wire interface.

Command Byte–

prepares device

for block

operation.

Slave Address–

equivalent to chip-

select line of a 3-

wire interface.

Data Byte–data goes into the register set by the

command byte.

S = Start condition.

P = Stop condition.

Shaded = Slave transmission.

SR = Repeated start condition.

Figure 7. SMBus/I2C Protocols

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