MAX6651 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX6651

Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface

Maxim Integrated 

MAX6650/MAX6651

Fan-Speed Regulators and Monitors

with SMBus/I2C-Compatible Interface

S

ADDRESS

7 bits

Slave Address

WR

ACK

0

COMMAND

8 bits

ACK

DATA

8 bits

ACK

P

Command byte: Selects

which register you are

writing to.

Data byte: Data goes into

the register set by the

command byte (to set

thresholds, configuration

masks, and sampling rate).

Figure 2a. SMBus Protocol: Write Byte Format

S

ADDRESS

7 bits

Slave Address

WR

ACK

COMMAND

ACK

0

8 bits

Command byte: Selects

which register you are

reading from.

S

ADDRESS

7 bits

RD

ACK

1

DATA

8 bits

A

P

Slave Address.

Repeated due to

change in data-flow

direction

Data byte: Reads from

the register set by the

command byte.

Figure 2b. SMBus Protocol: Read Byte Format

S

ADDRESS

RD

ACK

DATA

A

P

7 bits

1

8 bits

Slave Address

Data byte: Reads data

from the register com-

manded by the last

read-byte or write-byte

transmission; also

used for SMBus alert

response return address.

Figure 2c. SMBus Protocol: Receive Byte Format

S = Start condition

P = Stop condition

Shaded = Slave transmission

ACK = Acknowledged = 0

A = Not acknowledged = 1

WR = Write = 0

RD = Read =1

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