MAX6653 데이터 시트보기 (PDF) - Maxim Integrated
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MAX6653 Datasheet PDF : 24 Pages
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Temperature Monitors and
PWM Fan Controllers
Write Byte Format
S
ADDRESS
WR
ACK
COMMAND
ACK
DATA
ACK
P
7 bits
8 bits
8 bits
Slave Address: equiva-
lent to chip-select line of
a 3-wire interface
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)
Read Byte Format
S ADDRESS WR ACK COMMAND ACK S ADDRESS RD ACK DATA / / /
P
7 bits
8 bits
7 bits
8 bits
Slave Address: equiva-
lent to chip-select line
Command Byte: selects
which register you are
reading from
Slave Address: repeated
due to change in data-
flow direction
Data Byte: reads from
the register set by the
command byte
Send Byte Format
Receive Byte Format
S ADDRESS WR ACK COMMAND ACK P
7 bits
8 bits
Data Byte: writes data to the
register commanded by the
last read byte or write byte
transmission
S = Start condition Shaded = Slave transmission
P = Stop condition / / / = Not acknowledged
S ADDRESS RD ACK DATA / / /
P
7 bits
8 bits
Data Byte: reads data from
the register commanded
by the last read byte or
write byte transmission;
also used for SMBus alert
response return address
Figure 1. SMBus Protocols
A
B
C
D
EF
G
tLOW tHIGH
SMBCLK
SMBDATA
tSU:STA tHD:STA
tSU:DAT
tHD:DAT
A = START CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVE
E = SLAVE PULLS SMBDATA LINE LOW
Figure 2. SMBus Write Timing Diagram
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO SLAVE
H = LSB OF DATA CLOCKED INTO SLAVE
I = MASTER PULLS DATA LINE LOW
H
I JK
LM
tSU:STO tBUF
J = ACKNOWLEDGE CLOCKED INTO SLAVE
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION, DATA EXECUTED BY SLAVE
M = NEW START CONDITION
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