Rainbow-electronics MAX6681 Bedienungsanleitung

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General Description
The MAX6680/MAX6681 are precise, two-channel digi-
tal thermometers. Each accurately measures the tem-
perature of its own die and one remote PN junction and
reports the temperature on a 2-wire serial interface. The
remote junction can be a diode-connected transistor
like the low-cost NPN type 2N3904 or PNP type
2N3906. The remote junction can also be a common-
collector PNP, such as a substrate PNP of a micro-
processor.
The MAX6680/MAX6681 include pin-programmable
default temperature thresholds for the OVERT output,
which provides fail-safe clock throttling or system shut-
down. In addition, the devices are pin programmable to
select whether the OVERT output responds to either the
local, remote, or both temperatures.
The 2-wire serial interface accepts standard System
Management Bus (SMBus)™ commands such as Write
Byte, Read Byte, Send Byte, and Receive Byte to read
the temperature data and program the alarm thresholds
and conversion rate. The MAX6680/MAX6681 can func-
tion autonomously with a programmable conversion
rate, which allows the control of supply current and
temperature update rate to match system needs. For
conversion rates of 4Hz or less, the remote sensor tem-
perature can be represented in extended mode as 10
bits + sign with a resolution of 0.125°C. When the con-
version rate is 8Hz, output data is 7 bits + sign with a
resolution of 1°C. The MAX6680/MAX6681 also include
an SMBus timeout feature to enhance system reliability.
The MAX6681 is an upgrade to the MAX6654. The
MAX6680/MAX6681 remote accuracy is ±1°C with no
calibration needed. They are available in a 16-pin
QSOP package and operate throughout the -55°C to
+125°C temperature range.
Applications
Features
Two Alarm Outputs: ALERT and OVERT
Pin-Programmable Threshold for OVERT Limit
Programmable Under/Overtemperature ALERT
Limit
Dual Channel: Measures Remote and Local
Temperature
11-Bit, 0.125°C Resolution for Remote Temperature
Measurements
High Accuracy ±1°C (max) from +60°C to +100°C
(Remote)
No Calibration Required
SMBus/I
2
C™-Compatible Interface
SMBus Timeout Prevents SMBus Lockup
MAX6680/MAX6681
±1°C Fail-Safe Remote/Local Temperature
Sensors with SMBus Interface
________________________________________________________________ Maxim Integrated Products 1
CLOCK
DATA
TO SYSTEM
SHUTDOWN
STBY
CRIT1CRIT0GND
OVERT
SMBCLK
RESET
SMBDATA
V
CC
INTERRUPT
TO µP
0.1µF
2200pF
DXN
MICROPROCESSOR
DXP
200
10k
EACH
ALERT
3.3V
INT_SEL
SENS_SEL
ADD1
ADD0
MAX6680
MAX6681
Typical Operating Circuit
Ordering Information
19-2305; Rev 0; 4/02
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
MAX6680MEE -55°C to +125°C 16 QSOP
MAX6681MEE -55°C to +125°C 16 QSOP
SMBus is a trademark of Intel Corp.
I
2
C is a trademark of Philips Corp.
Pin Configurations appear at end of data sheet.
Desktop Computers
Notebook
Computers
Servers
Thin Clients
Workstations
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Inhaltsverzeichnis

Seite 1 - Sensors with SMBus Interface

General DescriptionThe MAX6680/MAX6681 are precise, two-channel digi-tal thermometers. Each accurately measures the tem-perature of its own die and on

Seite 2

MAX6680/MAX6681To ensure valid extended data, read extended resolu-tion temperature data using one of the followingapproaches:1) Put the MAX6680/MAX66

Seite 3

ture returns within the limits. An open diode also setsthis output.Alert Response AddressThe SMBus Alert Response interrupt pointer providesquick faul

Seite 4

MAX6680/MAX6681depending on the type of slave device.) Successfulcompletion of the Alert Response protocol clears theinterrupt latch, provided the con

Seite 5

still exists, they are reasserted at the end of the nextconversion. If the MAX6680/MAX6681 are operating inthe comparator mode, bits 2–6 of the Status

Seite 6

MAX6680/MAX6681autonomous mode (RUN/STOP = 0). This variable ratecontrol can be used to reduce the supply current inportable-equipment applications. T

Seite 7

reside on the same bus without address conflicts(Table 9).The address pin states are checked at POR and RESETonly, and the address data stays latched

Seite 8

MAX6680/MAX6681±1°C Fail-Safe Remote/Local TemperatureSensors with SMBus Interface16 _________________________________________________________________

Seite 9

MAX6680/MAX6681±1°C Fail-Safe Remote/Local TemperatureSensors with SMBus InterfaceMaxim cannot assume responsibility for use of any circuitry other th

Seite 10

MAX6680/MAX6681±1°C Fail-Safe Remote/Local TemperatureSensors with SMBus Interface2 __________________________________________________________________

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MAX6680/MAX6681±1°C Fail-Safe Remote/Local TemperatureSensors with SMBus Interface____________________________________________________________________

Seite 12

MAX6680/MAX6681±1°C Fail-Safe Remote/Local TemperatureSensors with SMBus Interface4 __________________________________________________________________

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MAX6680/MAX6681±1°C Fail-Safe Remote/Local TemperatureSensors with SMBus Interface____________________________________________________________________

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MAX6680/MAX6681Detailed DescriptionThe MAX6680/MAX6681 are temperature sensors designedto work in conjunction with a microprocessor or other intellige

Seite 15

age and computes the temperature based on this volt-age. If the remote channel is not used, connect DXP toDXN. Do not leave DXP and DXN unconnected.Wh

Seite 16

MAX6680/MAX6681ply hum. In noisy environments, high-frequency noisereduction is needed for high-accuracy remote mea-surements. The noise can be reduce

Seite 17

ture registers are not updated. The previous data is notchanged and remains available.SMBus Digital Interface From a software perspective, the MAX6680

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