MAX6642_09 Datasheet, PDF (1/14 Pages) Maxim Integrated Products – ±1°C, SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm

19-2920; Rev 2; 7/09
EVAALVUAAILTAIOBNLEKIT
±1°C, SMBus-Compatible Remote/Local
Temperature Sensor with Overtemperature Alarm
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.
Desktop Computers
Notebook Computers
Servers
Thin Clients
Test and Measurement
Workstations
Graphic Cards
Applications
Selector Guide
PART
MEASURED TEMP RANGE
MAX6642ATT90-T
0°C to +150°C
MAX6642ATT92-T
0°C to +150°C
MAX6642ATT94-T
0°C to +150°C
MAX6642ATT96-T
0°C to +150°C
MAX6642ATT98-T
0°C to +150°C
MAX6642ATT9A-T
0°C to +150°C
MAX6642ATT9C-T
0°C to +150°C
MAX6642ATT9E-T
0°C to +150°C
SMBus is a trademark of Intel Corp.
TOP
MARK
AFC
AFD
AFE
AFF
AEW
AFG
AFH
AFI
Features
o Dual Channel: Measures Remote and Local
Temperature
o +0.25°C Resolution
o High Accuracy ±1°C (max) (Remote) and
±2°C (Local) from +60°C to +100°C
o Measures Remote Temperature Up to +150°C
o Programmable Overtemperature Alarm
Temperature Thresholds
o SMBus/I²C-Compatible Interface
o Tiny TDFN Package with Exposed Pad
Ordering Information
PART
MAX6642ATT90-T
MAX6642ATT92-T
MAX6642ATT94-T
MAX6642ATT96-T
MAX6642ATT98-T
MAX6642ATT9A-T
MAX6642ATT9C-T
MAX6642ATT9E-T
T = Tape and reel.
*EP = Exposed pad.
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
6 TDFN-EP*
6 TDFN-EP*
6 TDFN-EP*
6 TDFN-EP*
6 TDFN-EP*
6 TDFN-EP*
6 TDFN-EP*
6 TDFN-EP*
Pin Configuration and Functional Diagram appear at end of
data sheet.
Typical Operating Circuit
0.1μF
3.3V
47Ω
V_CC
2200pF
MAX6642
DXP
SDA
SCLK
ALERT
μP
GND
10kΩ EACH
DATA
CLOCK
INTERRUPT TO μP
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.