MAX6642ATT90+T Maxim Integrated Products, MAX6642ATT90+T Datasheet - Page 6

• Manufacturer Part Number: MAX6642ATT90+T
• Description: IC TEMP SENSOR SMBUS 6-TDFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX6642ATT90+T

• Function: Temp Monitoring System (Sensor)
• Topology: ADC, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 125°C, 0°C ~ 150°C
• Output Type: I²C™/SMBus™
• Output Alarm: Yes
• Output Fan: No
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 6-TDFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MAX6642ATT90+T; MAX6642ATT90+TTR

±1°C, SMBus-Compatible Remote/Local
Temperature Sensor with Overtemperature Alarm
Figure 1. SMBus Protocols
Figure 2. SMBus Write Timing Diagram
6
SMBCLK
SMBDATA
WRITE BYTE FORMAT
READ BYTE FORMAT
SEND BYTE FORMAT
_______________________________________________________________________________________
S
S
S = START CONDITION
P = STOP CONDITION
S
A = START CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVE
SLAVE ADDRESS: EQUIVA-
LENT TO CHIP SELECT LINE
ADDRESS
ADDRESS
t
SU:STA
7 BITS
7 BITS
SLAVE ADDRESS: EQUIVA-
LENT TO CHIP-SELECT LINE OF
A 3-WIRE INTERFACE
A
ADDRESS
t
HD:STA
7 BITS
WR
WR
t
LOW
SHADED = SLAVE TRANSMISSION
/// = NOT ACKNOWLEDGED
B
t
HIGH
ACK
ACK
WR
COMMAND BYTE: SENDS COM-
MAND WITH NO DATA, USUALLY
USED FOR ONE-SHOT COMMAND
COMMAND BYTE: SELECTS
WHICH REGISTER YOU ARE
REDING FROM
COMMAND
t
SU:DAT
COMMAND
8 BITS
8 BITS
C
ACK
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
ACK
D
ACK
P
COMMAND
E
8 BITS
F
S
RECEIVE BYTE FORMAT
SLAVE ADDRESS: REPEATED
DUE TO CHANGE IN DATA-
FLOW DIRECTION
S
ADDRESS
G
7 BITS
ADDRESS
7 BITS
ACK
RD
DATA BYTE: DATA GOES INTO THE REGISTER
SET BY THE COMMAND BYTE (TO SET
THRESHOLDS, CONFIGURATION MASKS, AND
SAMPLING RATE)
RD
I = SLAVE PULLS DATA LINE LOW
J = ACKNOWLEDGE CLOCKED INTO MASTER
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION
M = NEW START CONDITION
H
DATA
8 BITS
ACK
ACK
I
DATA BYTE: READS FROM
THE REGISTER SET BY THE
COMMAND BYTE
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
J
8 BITS
DATA
DATA
8 BITS
K
ACK
///
t
SU:STO
///
L
P
1
t
BUF
P
P
M