Rainbow-electronics MAX6642 Manual do Utilizador

Consulte online ou descarregue Manual do Utilizador para Sensores Rainbow-electronics MAX6642. Rainbow Electronics MAX6642 User Manual Manual do Utilizador

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General Description
The MAX6642 is a precise, two-channel digital temper-
ature sensor. It accurately measures the temperature of
its own die and a remote PN junction, and reports the
temperature data over a 2-wire serial interface. The
remote PN junction is typically a substrate PNP transis-
tor on the die of a CPU, ASIC, GPU, or FPGA. The
remote PN junction can also be a discrete diode-con-
nected 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.
Applications
Desktop Computers
Notebook Computers
Servers
Thin Clients
Test and Measurement
Workstations
Graphic Cards
Features
Dual Channel: Measures Remote and Local
Temperature
+0.25°C Resolution
High Accuracy ±1°C (max) (Remote) and
±2°C (Local) from +60°C to +100°C
Measures Remote Temperature Up to +150°C
Programmable Overtemperature Alarm
Temperature Thresholds
SMBus/I
2
C
TM
-Compatible Interface
Tiny TDFN Package
MAX6642
±1°C, SMBus-Compatible Remote/Local
Temperature Sensor with Overtemperature Alarm
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-2920; Rev 0; 8/03
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
PART TEMP RANGE PIN-PACKAGE
MAX6642ATT90-T -40°C to +125°C 6 TDFN
MAX6642ATT92-T -40°C to +125°C 6 TDFN
MAX6642ATT94-T -40°C to +125°C 6 TDFN
MAX6642ATT96-T -40°C to +125°C 6 TDFN
MAX6642ATT98-T -40°C to +125°C 6 TDFN
MAX6642ATT9A-T -40°C to +125°C 6 TDFN
MAX6642ATT9C-T -40°C to +125°C 6 TDFN
MAX6642ATT9E-T -40°C to +125°C 6 TDFN
MAX6642
2200pF
0.1µF
µP
DXP
GND
SDA
SCLK
ALERT
DATA
CLOCK
INTERRUPT TO µP
47
10kEACH
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
SMBus is a trademark of Intel Corp.
Purchase of I
2
C components of Maxim Integrated Products, Inc.
or one of its sublicensed Associated Companies, conveys a
license under the Philips I
2
C Patent Rights to use these compo-
nents in an I
2
C system, provided that the system conforms to the
I
2
C Standard Specification as defined by Philips.
Pin Configuration and Functional Diagram appear at end of
data sheet.
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Resumo do Conteúdo

Página 1 - 19-2920; Rev 0; 8/03

General DescriptionThe MAX6642 is a precise, two-channel digital temper-ature sensor. It accurately measures the temperature ofits own die and a remot

Página 2 - ABSOLUTE MAXIMUM RATINGS

MAX6642where temperature is measured in Kelvin andnNOMIMALfor the MAX6642 is 1.008.As an example, assume you want to use the MAX6642with a CPU that ha

Página 3

due to the rise time of the switched current source.Nearly all noise sources tested cause the temperatureconversion results to be higher than the actu

Página 4 - = 3.3V, T

MAX6642tracks the actual temperature within a conversion cycle.When measuring temperature with discrete remote sen-sors, smaller packages, such as SOT

Página 5 - Pin Description

MAX6642±1°C, SMBus-Compatible Remote/LocalTemperature Sensor with Overtemperature AlarmMaxim cannot assume responsibility for use of any circuitry oth

Página 6

MAX6642±1°C, SMBus-Compatible Remote/LocalTemperature Sensor with Overtemperature Alarm2 _____________________________________________________________

Página 7 - Table 2. Extended Resolution

MAX6642±1°C, SMBus-Compatible Remote/LocalTemperature Sensor with Overtemperature Alarm_______________________________________________________________

Página 8 - Command Byte Functions

MAX6642±1°C, SMBus-Compatible Remote/LocalTemperature Sensor with Overtemperature Alarm4 _____________________________________________________________

Página 9 - Applications Information

Detailed DescriptionThe MAX6642 is a temperature sensor for localand remote temperature-monitoring applications.Communication with the MAX6642 occurs

Página 10 - Manufacturers

MAX6642register was previously selected by a Write Byteinstruction. Use caution when using the shorter proto-cols in multimaster systems, as a second

Página 11 - Thermal Mass and Self-Heating

When a conversion is complete, the main temperatureregister and the extended temperature register areupdated. Alarm Threshold RegistersTwo registers s

Página 12 - Pin Configuration

MAX6642(0001 100). Following such a broadcast, any slavedevice that generated an interrupt attempts to identifyitself by putting its own address on th

Página 13 - Package Information

command byte) that occurs immediately after PORreturns the current local temperature data.Single-ShotThe single-shot command immediately forces a newc

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