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MAX6642ATT9C+T

P1-P3P4-P6P7-P9P10-P12P13-P14
MAX6642
±1°C, SMBus-Compatible Remote/
Local Temperature Sensor with
Overtemperature Alarm
EVALUATION KIT AVAILABLE
General Description
The MAX6642 precise, two-channel digital temperature
sensor accurately measures the temperature of its own
die and a remote PN junction and reports the tempera-
ture data over a 2-wire serial interface. The remote PN
junction is typically a substrate PNP transistor on the
die of a CPU, ASIC, GPU, or FPGA. The remote PN
junction can also be a discrete diode-connected small-
signal transistor.
The 2-wire serial interface accepts standard system
management bus (SMBus™), Write Byte, Read Byte,
Send Byte, and Receive Byte commands to read the
temperature data and to program the alarm thresholds.
To enhance system reliability, the MAX6642 includes an
SMBus timeout. The temperature data format is 10 bit
with the least significant bit (LSB) corresponding to
+0.25°C. The ALERT output asserts when the local or
remote overtemperature thresholds are violated. A fault
queue may be used to prevent the ALERT output from
setting until two consecutive faults have been detected.
Measurements can be done autonomously or in a sin-
gle-shot mode.
Remote accuracy is ±1°C maximum error between
+60°C and +100°C. The MAX6642 operates from -40°C
to +125°C, and measures remote temperatures
between 0°C and +150°C. The MAX6642 is available in
a 6-pin TDFN package with an exposed pad.
Applications
Desktop Computers
Notebook Computers
Servers
Thin Clients
Test and Measurement
Workstations
Graphic Cards
Benefits and Features
• Integrated Temperature Sensor Enables Simultaneous
Dual Temperature (Remote and Local) Measurements
• Remote Accuracy ±1°C
• Local Accuracy ±2°C from +60°C to +100°C
• Measures Remote Temperature up to +150°C
• 0.25°C Resolution
• Dual Zone Monitoring Automates Over-Temperature
Alarms
• Programmable Remote/Local Temperature
Thresholds
• ALERT Output
• Small Footprint
• 3mm x 3mm TDFN Package with Exposed Pad
• Low Thermal Mass Reduces Measurement Latency
• SMBus/I
2
C Address Hardwired
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX6642ATT90-T -40°C to +125°C 6 TDFN-EP*
MAX6642ATT92-T -40°C to +125°C 6 TDFN-EP*
MAX6642ATT94-T -40°C to +125°C 6 TDFN-EP*
MAX6642ATT96-T -40°C to +125°C 6 TDFN-EP*
MAX6642ATT98-T -40°C to +125°C 6 TDFN-EP*
MAX6642ATT9A-T -40°C to +125°C 6 TDFN-EP*
MAX6642ATT9C-T -40°C to +125°C 6 TDFN-EP*
MAX6642ATT9E-T -40°C to +125°C 6 TDFN-EP*
MAX6642
2200pF
0.1µF
µP
DXP
GND
SDA
SCLK
ALERT
DATA
CLOCK
INTERRUPT TO µP
47Ω
10kΩ EACH
3.3V
V
CC
Typical Operating Circuit
PART
MEASURED TEMP RANGE
TOP
MARK
MAX6642ATT90-T 0°C to +150°C
AFC
MAX6642ATT92-T 0°C to +150°C
AFD
MAX6642ATT94-T 0°C to +150°C
AFE
MAX6642ATT96-T 0°C to +150°C
AFF
MAX6642ATT98-T 0°C to +150°C
AEW
MAX6642ATT9A-T 0°C to +150°C
AFG
MAX6642ATT9C-T 0°C to +150°C
AFH
MAX6642ATT9E-T 0°C to +150°C AFI
Selector Guide
T = Tape and reel.
*
EP = Exposed pad.
Pin Configuration and Functional Diagram appear at end of
data sheet.
SMBus is a trademark of Intel Corp.
19-2920; Rev 5; 11/15
MAX6642
±1°C, SMBus-Compatible Remote/
Local Temperature Sensor with
Overtemperature Alarm
Maxim Integrated | 2www.maximintegrated.com
Absolute Maximum Ratings
Electrical Characteristics
(V
CC
= +3.0V to +5.5V, T
A
= -40°C to +125°C, unless otherwise specified. Typical values are at V
CC
= +3.3V and T
A
= +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
All Voltages Referenced to GND
V
CC
...........................................................................-0.3V to +6V
DXP.............................................................-0.3V to (V
CC
+ 0.3V)
SCLK, SDA, ALERT ..................................................-0.3V to +6V
SDA, ALERT Current ...........................................-1mA to +50mA
Continuous Power Dissipation (T
A
= +70°C)
6-Pin TDFN (derate 24.4mW/°C above +70°C) .........1951mW
ESD Protection (all pins, Human Body Model) ................±2000V
Junction Temperature......................................................+150°C
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage V
CC
3.0 5.5 V
0.25 °C
Temperature Resolution
10 Bits
T
RJ
= +60°C to +100°C,
T
A
= +25°C to +85°C
-1.0 +1.0
T
RJ
= 0°C to +125°C -3.0 +3.0
Remote Temperature Error V
CC
= 3.3V
T
RJ
= +125°C to +150°C -3.5 +3.5
°C
T
A
= +60°C to +100°C -2.0 +2.0
Local Temperature Error V
CC
= 3.3V
T
A
= 0°C to +125°C -3.0 +3.0
°C
Supply Sensitivity of Temperature
Error
±0.2 °C/V
Undervoltage Lockout Threshold UVLO Falling edge of V
CC
disables ADC 2.4 2.7 2.95 V
Undervoltage Lockout Hysteresis 90 mV
Power-On-Reset (POR) Threshold V
CC
falling edge 1.5 2.0 2.4 V
POR Threshold Hysteresis 90 mV
Standby Supply Current SMBus static 3 10 µA
Operating Current During conversion 0.5 1.0 mA
Average Operating Current 260 µA
Conversion Time t
CONV
From stop bit to conversion completion 106 125 143 ms
Conversion Rate f
CONV
8Hz
High level 80 100 120
Remote-Diode Source Current I
RJ
Low level 8 10 12
µA
ALERT
V
OL
= 0.4V 1
Output-Low Sink Current
V
OL
= 0.6V 4
mA
Output-High Leakage Current V
OH
= V
CC
1µA
MAX6642
±1°C, SMBus-Compatible Remote/
Local Temperature Sensor with
Overtemperature Alarm
Maxim Integrated | 3www.maximintegrated.com
Note 1: All parameters tested at T
A
= +25°C. Specifications over temperature are guaranteed by design.
Note 2: Timing specifications guaranteed by design.
Note 3: The serial interface resets when SCLK is low for more than t
TIMEOUT
.
Note 4: A transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SCLK’s falling edge.
Electrical Characteristics (continued)
(V
CC
= +3.0V to +5.5V, T
A
= -40°C to +125°C, unless otherwise specified. Typical values are at V
CC
= +3.3V and T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SMBus-COMPATIBLE INTERFACE (SCLK and SDA)
Logic Input Low Voltage V
IL
0.8 V
Logic Input High Voltage V
IH
V
CC
= 3.0V 2.2 V
Input Leakage Current I
LEAK
V
IN
= GND or 5.5V -1 +1 µA
Output Low Sink Current I
OL
V
OL
= 0.6V 6 mA
Input Capacitance C
IN
5pF
SMBus TIMING (Note 2)
Serial Clock Frequency f
SCLK
(Note 3) 100 kHz
Bus Free Time Between STOP
and START Condition
t
BUF
4.7 µs
START Condition Setup Time 4.7 µs
Repeat START Condition Setup
Time
t
SU:STA
90% to 90% 50 ns
START Condition Hold Time t
HD:STA
10% of SDA to 90% of SCLK 4 µs
STOP Condition Setup Time t
SU:STO
90% of SCLK to 90% of SDA 4 µs
Clock Low Period t
LOW
10% to 10% 4.7 µs
Clock High Period t
HIGH
90% to 90% 4 µs
Data Setup Time t
HD:DAT
(Note 4) 250 µs
Receive SCLK/SDA Rise Time t
R
1µs
Receive SCLK/SDA Fall Time t
F
300 ns
Pulse Width of Spike Suppressed t
SP
050ns
SMBus Timeout t
TIMEOUT
SDA low period for interface reset 20 28 40 ms
P1-P3P4-P6P7-P9P10-P12P13-P14

MAX6642ATT9C+T

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Buy MAX6642ATT9C+T
Manufacturer:
Maxim Integrated
Description:
Board Mount Temperature Sensors SMBus-Compatible Temperature Senso
Lifecycle:
New from this manufacturer.
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