MAX6642ATT9C-T Просмотр технического описания (PDF) - Maxim Integrated
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MAX6642ATT9C-T
Maxim Integrated
MAX6642ATT9C-T Datasheet PDF : 14 Pages
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MAX6642
±1°C, SMBus-Compatible Remote/
Local Temperature Sensor with
Overtemperature Alarm
WRITE BYTE FORMAT
S
ADDRESS
WR
ACK
7 BITS
SLAVE ADDRESS: EQUIVA-
LENT TO CHIP-SELECT LINE OF
A 3-WIRE INTERFACE
COMMAND
8 BITS
READ BYTE FORMAT
S ADDRESS WR
ACK
COMMAND
ACK
S
7 BITS
8 BITS
SLAVE ADDRESS: EQUIVA-
LENT TO CHIP SELECT LINE
COMMAND BYTE: SELECTS
WHICH REGISTER YOU ARE
REDING FROM
ACK
DATA
ACK
P
8 BITS
1
DATA BYTE: DATA GOES INTO THE REGISTER
SET BY THE COMMAND BYTE (TO SET
THRESHOLDS, CONFIGURATION MASKS, AND
SAMPLING RATE)
ADDRESS
RD
ACK
DATA
///
P
7 BITS
8 BITS
SLAVE ADDRESS: REPEATED
DUE TO CHANGE IN DATA-
FLOW DIRECTION
DATA BYTE: READS FROM
THE REGISTER SET BY THE
COMMAND BYTE
SEND BYTE FORMAT
S ADDRESS WR
7 BITS
ACK
COMMAND
ACK
P
8 BITS
COMMAND BYTE: SENDS COM-
MAND WITH NO DATA, USUALLY
USED FOR ONE-SHOT COMMAND
S = START CONDITION SHADED = SLAVE TRANSMISSION
P = STOP CONDITION /// = NOT ACKNOWLEDGED
RECEIVE BYTE FORMAT
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
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
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO SLAVE
H = LSB OF DATA CLOCKED INTO SLAVE
Figure 2. SMBus Write Timing Diagram
H
IJK
LM
tSU:STO tBUF
I = SLAVE PULLS DATA LINE LOW
J = ACKNOWLEDGE CLOCKED INTO MASTER
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION
M = NEW START CONDITION
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