MAX6681MEE+【PDF 1/17 页】IC TEMP SENSOR SMBUS 16-QSOP

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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癈. When the con-

version rate is 8Hz, output data is 7 bits + sign with a

resolution of 1癈. 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 ?癈 with no

calibration needed. They are available in a 16-pin

QSOP package and operate throughout the -55癈 to

+125癈 temperature range.

Applications

Features

f Two Alarm Outputs: ALERT and OVERT

f Pin-Programmable Threshold for OVERT Limit

f Programmable Under/Overtemperature ALERT

Limit

f Dual Channel: Measures Remote and Local

Temperature

f 11-Bit, 0.125?/SPAN>C Resolution for Remote Temperature

Measurements

f High Accuracy ?/SPAN>1?/SPAN>C (max) from +60?/SPAN>C to +100?/SPAN>C

(Remote)

f No Calibration Required

f SMBus/I

C"-Compatible Interface

f SMBus Timeout Prevents SMBus Lockup

?癈 Fail-Safe Remote/Local Temperature

Sensors with SMBus Interface

________________________________________________________________ Maxim Integrated Products 1

CLOCK

DATA

TO SYSTEM

SHUTDOWN

STBY

CRIT1

CRIT0

GND

OVERT

SMBCLK

RESET

SMBDATA

INTERRUPT

TO 礟

0.1礔

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 1; 1/05

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxims website at www.maxim-ic.com.

PART

TEMP RANGE

PIN-PACKAGE

MAX6680MEE

-55癈 to +125癈

16 QSOP

MAX6681MEE

-55癈 to +125癈

16 QSOP

SMBus is a trademark of Intel Corp.

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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