Rainbow-electronics MAX6692 User Manual download pdf

General Description

The MAX6648/MAX6692 are precise, two-channel digi-

tal temperature sensors. They accurately 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 junction 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

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 MAX6648/MAX6692

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 MAX6648/MAX6692 provide two system alarms:

ALERT and OVERT. ALERT asserts when any of four tem-

perature conditions are violated: local overtemperature,

remote overtemperature, local undertemperature, or

remote undertemperature. OVERT asserts when the tem-

perature 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, with the

conversion rate programmed by the user, or in a single-

shot mode. The adjustable conversion rate allows the

user to optimize supply current and temperature

update rate to match system needs.

Remote accuracy is ±0.8°C maximum error between

+25°C and +125°C with no calibration needed. The

MAX6648/MAX6692 operate from -55°C to +125°C, and

measure temperatures between 0°C and +125°C. The

MAX6648 is available in an 8-pin µMAX package, and the

MAX6692 is available in 8-pin µMAX and SO packages.

Applications

Desktop Computers

Notebook Computers

Servers

Thin Clients

Workstations

Test and Measurement

Multichip Modules

Features

♦ Dual Channel: Measures Remote and Local

Temperature

♦ 0.125°C Resolution

♦ High Accuracy: ±0.8°C (max) from +25°C to

+125°C (Remote), and ±2°C (max) from +60°C to

+100°C (Local)

♦ Two Alarm Outputs: ALERT and OVERT

♦ Two Default OVERT Thresholds Available

MAX6648: +110°C

MAX6692: +85°C

♦ Programmable Conversion Rate

♦ SMBus-Compatible Interface

♦ SMBus Timeout

♦ Programmable Under/Overtemperature Alarm

Thresholds

MAX6648/MAX6692

Precision SMBus-Compatible Remote/Local

Temperature Sensors with Overtemperature Alarms

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

DXP

DXN

10kΩ EACH

CLOCK

TO FAN DRIVER OR

SYSTEM SHUTDOWN

3.3V

DATA

INTERRUPTED TO µP

200Ω

0.1µF

SDA

SCLK

ALERT

GND

2200pF

µP

MAX6648

MAX6692

OVERT

Typical Operating Circuit

19-2545; Rev 0; 8/02

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

MEASURED

TEMP RANGE

MAX6648MUA*

-55°C to +125°C

8 µMAX

0°C to +125°C

MAX6692MUA

-55°C to +125°C

8 µMAX

0°C to +125°C

MAX6692MSA

-55°C to +125°C

8 SO

0°C to +125°C

SMBus is a trademark of Intel Corp.

Pin Configuration and Functional Diagram appear at end of

data sheet.

*Future product—contact factory for availability.

1 2 3 4 5 6 ... 16 17

Summary of Contents

Page 1 - MAX6648/MAX6692

General DescriptionThe MAX6648/MAX6692 are precise, two-channel digi-tal temperature sensors. They accurately measure thetemperature of their own die

Page 2

MAX6648/MAX6692Precision SMBus-Compatible Remote/LocalTemperature Sensors with Overtemperature Alarms10 ______________________________________________

Page 3

MAX6648/MAX6692Precision SMBus-Compatible Remote/LocalTemperature Sensors with Overtemperature Alarms_________________________________________________

Page 4

MAX6648/MAX6692Precision SMBus-Compatible Remote/LocalTemperature Sensors with Overtemperature Alarms12 ______________________________________________

Page 5

surements. The noise can be reduced with careful PCboard layout and proper external noise filtering.High-frequency EMI is best filtered at DXP and DXN

Page 6

MAX6648/MAX6692Precision SMBus-Compatible Remote/LocalTemperature Sensors with Overtemperature Alarms14 ______________________________________________

Page 7

MAX6648/MAX6692Precision SMBus-Compatible Remote/LocalTemperature Sensors with Overtemperature Alarms_________________________________________________

Page 8

MAX6648/MAX6692Precision SMBus-Compatible Remote/LocalTemperature Sensors with Overtemperature Alarms16 ______________________________________________

Page 9

MAX6648/MAX6692Precision SMBus-Compatible Remote/LocalTemperature Sensors with Overtemperature AlarmsMaxim cannot assume responsibility for use of any

Page 10

MAX6648/MAX6692Precision SMBus-Compatible Remote/LocalTemperature Sensors with Overtemperature Alarms2 _______________________________________________

Page 11

MAX6648/MAX6692Precision SMBus-Compatible Remote/LocalTemperature Sensors with Overtemperature Alarms_________________________________________________

Page 12

MAX6648/MAX6692Precision SMBus-Compatible Remote/LocalTemperature Sensors with Overtemperature Alarms4 _______________________________________________

Page 13

MAX6648/MAX6692Precision SMBus-Compatible Remote/LocalTemperature Sensors with Overtemperature Alarms_________________________________________________

Page 14

MAX6648/MAX6692nel. If the remote-diode channel is unused, connectDXP to DXN rather than leaving the pins open. The DXN input is biased to one VBEabov

Page 15

MAX6648/MAX6692Precision SMBus-Compatible Remote/LocalTemperature Sensors with Overtemperature Alarms_________________________________________________

Page 16 - Package Information

MAX6648/MAX6692Precision SMBus-Compatible Remote/LocalTemperature Sensors with Overtemperature Alarms8 _______________________________________________

Page 17 - 9LUCSP, 3x3.EPS

MAX6648/MAX6692Precision SMBus-Compatible Remote/LocalTemperature Sensors with Overtemperature Alarms_________________________________________________

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Rainbow-electronics MAX6692 User Manual

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Summary of Contents

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