Rainbow-electronics MAX6871 Manual de usuario descargar pdf (Pagina 37)

MAX6870/MAX6871

EEPROM-Programmable Hex/Quad

Power-Supply Sequencers/Supervisors with ADC

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WRITE BYTE FORMAT

ADDRESS

7 bits

SEND BYTE FORMAT

RECEIVE BYTE FORMAT

ACK

DATA

8 bits

ACK P

Data Byte–presets the

internal address pointer.

Data Byte–reads data from

the register commanded by

the last read byte or write

byte transmission. Also

dependent on a send byte.

WRITE WORD FORMAT

S ADDRESS WR

ACK ACK ACK ACKCOMMAND DATA DATA P

7 bits 8 bits 8 bits 8 bits

Slave Address–

equivalent to chip-

select line of a 3-

wire interface.

Command Byte–

MSB of the

EEPROM

written.

Data Byte–first byte is the LSB of

the EEPROM address. Second

byte is the actual data.

BLOCK WRITE FORMAT

S ADDRESS WR

ACK COMMAND ACK

BYTE

COUNT= N

ACK

DATA BYTE

ACK

DATA BYTE

...

ACK

DATA BYTE

ACK P

7 bits 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

8 bits

BYTE

COUNT= 16

ACK

DATA BYTE

ACK

DATA BYTE

...

ACK

DATA BYTE

ACK P

7 bits 8 bits 7 bits 10h 8 bits8 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.

Slave Address–

equivalent to chip-

select line of a 3-

wire interface.

Slave Address–

equivalent to chip-

select line of a 3-

wire interface.

S ADDRESS WR ACK COMMAND ACK DATA ACK P

7 bits 8 bits 8 bits

Slave Address–

equivalent to chip-

select line of a 3-

wire interface.

Command Byte–

selects register

being written.

Data Byte–data goes into the

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.

Figure 7. SMBus/I

C Protocols

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 50 51

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Rainbow-electronics MAX6871 Manual de usuario Pagina 37

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