MAX6642ATT98+T Maxim Integrated Products, MAX6642ATT98+T Datasheet

IC TEMP SENSOR SMBUS 6-TDFN

MAX6642ATT98+T

Manufacturer Part Number
MAX6642ATT98+T
Description
IC TEMP SENSOR SMBUS 6-TDFN
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX6642ATT90T.pdf (14 pages)

Specifications of MAX6642ATT98+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
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.
19-2920; Rev 3; 10/09
SMBus is a trademark of Intel Corp.
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.
MAX6642ATT90-T
MAX6642ATT92-T
MAX6642ATT94-T
MAX6642ATT96-T
MAX6642ATT98-T
MAX6642ATT9A-T
MAX6642ATT9C-T
MAX6642ATT9E-T
Temperature Sensor with Overtemperature Alarm
Desktop Computers
Notebook Computers
Servers
Thin Clients
Test and Measurement
Workstations
Graphic Cards
PART
________________________________________________________________ Maxim Integrated Products
MEASURED TEMP RANGE
General Description
±1°C, SMBus-Compatible Remote/Local
0°C to +150°C
0°C to +150°C
0°C to +150°C
0°C to +150°C
0°C to +150°C
0°C to +150°C
0°C to +150°C
0°C to +150°C
Selector Guide
Applications
MARK
AEW
TOP
AFG
AFC
AFD
AFE
AFH
AFF
AFI
o Dual Channel: Measures Remote and Local
o +0.25°C Resolution
o High Accuracy ±1°C (max) (Remote) and
o Measures Remote Temperature Up to +150°C
o Programmable Overtemperature Alarm
o SMBus/I
o Tiny TDFN Package with Exposed Pad
T = Tape and reel.
* EP = Exposed pad.
Pin Configuration and Functional Diagram appear at end of
data sheet.
MAX6642ATT90-T
MAX6642ATT92-T
MAX6642ATT94-T
MAX6642ATT96-T
MAX6642ATT98-T
MAX6642ATT9A-T
MAX6642ATT9C-T
MAX6642ATT9E-T
Temperature
±2°C (Local) from +60°C to +100°C
Temperature Thresholds
μP
PART
2
2200pF
C-Compatible Interface
0.1μF
Typical Operating Circuit
DXP
V
CC
MAX6642
GND
Ordering Information
-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
47Ω
TEMP RANGE
ALERT
SCLK
SDA
3.3V
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*
Features
10kΩ EACH
DATA
CLOCK
INTERRUPT TO μP
1

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MAX6642ATT98+T Summary of contents

Page 1

... MAX6642ATT9C-T 0°C to +150°C MAX6642ATT9E-T 0°C to +150°C SMBus is a trademark of Intel Corp. ________________________________________________________________ Maxim Integrated Products 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. o Dual Channel: Measures Remote and Local Temperature o +0.25°C Resolution o High Accuracy ± ...

Page 2

SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm ABSOLUTE MAXIMUM RATINGS All Voltages Referenced to GND V ...........................................................................-0.3V to +6V CC DXP.............................................................-0. SCLK, SDA, ALERT ..................................................-0.3V to +6V SDA, ALERT Current ...........................................-1mA to +50mA Continuous Power Dissipation (T ...

Page 3

SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm ELECTRICAL CHARACTERISTICS (continued +3.0V to +5.5V -40°C to +125°C, unless otherwise specified. Typical values are PARAMETER SYMBOL SMBus-COMPATIBLE INTERFACE (SCLK and SDA) Logic Input ...

Page 4

SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm (V = 3.3V +25°C, unless otherwise noted STANDBY SUPPLY CURRENT vs. CLOCK FREQUENCY 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.01 0.1 1 CLOCK FREQUENCY (kHz) ...

Page 5

SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm PIN NAME Supply Voltage Input, +3V to +5.5V. Bypass recommended but not required for additional noise filtering. 2 GND Ground Combined Remote-Diode Current Source and ADC Input for ...

Page 6

SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm WRITE BYTE FORMAT S ADDRESS WR 7 BITS SLAVE ADDRESS: EQUIVA- LENT TO CHIP-SELECT LINE OF A 3-WIRE INTERFACE READ BYTE FORMAT S ADDRESS WR ACK 7 BITS SLAVE ADDRESS: EQUIVA- COMMAND ...

Page 7

SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm register was previously selected by a Write Byte instruction. Use caution when using the shorter proto- cols in multimaster systems second master could overwrite the command byte without informing the ...

Page 8

SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm Table 3. Command-Byte Assignments ESS 00h 00h ( 0000 0000) Read l ocal tem p er atur e 01h 00h ( 0000 ...

Page 9

SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm tion rules apply, and the device with the lower address code wins. The losing device does not generate an acknowledge and continues to hold the ALERT line low until cleared. (The conditions ...

Page 10

SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm III. A thermal diode on the substrate normally a PNP with its collector grounded. Connect the anode (emitter) to DXP and the cathode to GND of the MAX6642. ...

Page 11

SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm range. We have observed variations in remote tempera- ture readings of less than ±2°C with a variety of dis- crete transistors. Still good design practice to verify good consistency of ...

Page 12

SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm Cable resistance also affects remote-sensor accuracy. For every 1Ω of series resistance, the error is approxi- mately 1/2°C. Thermal Mass and Self-Heating When sensing local temperature, this device is intend ...

Page 13

SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm V CC DXP ALERT Q MAX6642 Pin Configuration TOP VIEW MAX6642 GND 2 EP* 3 DXP TDFN-EP *EXPOSED PAD CONNECTED TO GND. ______________________________________________________________________________________ MUX REMOTE ADC LOCAL DIODE FAULT ...

Page 14

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2009 Maxim Integrated Products DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products, Inc ...

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