MAX6649MUA/V+【PDF 1/16 页】IC SENSOR REMOTE SMBUS 8UMAX

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General Description

The MAX6646/MAX6647/MAX6649 are precise, two-

channel digital temperature sensors. The devices accu-

rately measure the temperature of their own die and a

remote PN junction, and report the temperature in digital

form using a 2-wire serial interface. The remote PN junc-

tion is typically the emitter-base junction of a common-

collector PNP on a CPU, FPGA, or ASIC.

The 2-wire serial interface accepts standard system man-

agement 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 MAX6646/MAX6647/MAX6649

include an SMBus timeout. A fault queue prevents the

ALERT and OVERT outputs from setting until a fault has

been detected one, two, or three consecutive times

(programmable).

The MAX6646/MAX6647/MAX6649 provide two system

alarms: ALERT and OVERT. ALERT asserts when any of

four temperature conditions are violated: local overtem-

perature, remote overtemperature, local undertempera-

ture, or remote undertemperature. OVERT asserts when

the temperature rises above the value in either of the two

OVERT limit registers. The OVERT output can be used to

activate a cooling fan, or to trigger a system shutdown.

Measurements can be done autonomously, at the pro-

grammed conversion rate, or in a single-shot mode. The

adjustable conversion rate allows optimizing supply cur-

rent and temperature update rate to match system needs.

Remote accuracy is ?癈 maximum error between +60癈

and +145癈 with no calibration needed. The MAX6646/

MAX6647/MAX6649 operate from -55癈 to +125癈, and

measure temperatures between 0癈 and +145癈. The

MAX6646/MAX6647/MAX6649 are available in an 8-pin

糓AX

?/DIV>

package.

Applications

Features

f Dual Channel: Measures Remote and Local

Temperature

f 0.125?/SPAN>C Resolution

f High Accuracy ?/SPAN>1?/SPAN>C (max) from +60?/SPAN>C to +145?/SPAN>C

(Remote), and ?癈 (max) from +60癈 to +100癈

(Local)

f Measures High-Ideality Thermal Diodes Up to

+170癈 (Apparent)

+145癈 (Real)

f Two Alarm Outputs: ALERT and OVERT

f Programmable Under/Overtemperature Alarm

Temperature Thresholds

f Programmable Conversion Rate

f SMBus-Compatible Interface

f SMBus Timeout

+145癈 Precision SMBus-Compatible Remote/

Local Sensors with Overtemperature Alarms

Ordering Information

DXP

DXN

10k?EACH

CLOCK

TO FAN DRIVER OR

SYSTEM SHUTDOWN

3.3V

DATA

INTERRUPT TO 糚

200?/DIV>

0.1糉

SDA

SCLK

ALERT

GND

2200pF

糚

MAX6646

MAX6647

MAX6649

OVERT

Typical Operating Circuit

19-2540; Rev 4; 7/12

For pricing, delivery, and ordering information, please contact Maxim Direct

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

PART

TEMP

RANGE

PIN-

PACKAGE

MEASURED

TEMP RANGE

MAX6646MUA+

-55癈 to

+125癈

8 糓AX

0癈 to +145癈

MAX6647MUA+

-55癈 to

+125癈

8 糓AX

0癈 to +145癈

MAX6649MUA+

-55癈 to

+125癈

8 糓AX

0癈 to +145癈

Selector Guide, Pin Configurations, and Functional Diagram

appear at end of data sheet.

+Denotes a lead(Pb)-free/RoHS-compliant package.

糓AX is a registered trademark of Maxim Integrated Products, Inc.

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