Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsSensorsTemperature sensor SMD

General Description

MAX6685/MAX6686 are dual-output temperature switches

that use an external diode-connected transistor as a sens-

ing element. These devices have two logic outputs (T

HIGH

and T

LOW

). T

HIGH

asserts a logic signal when the remote

temperature crosses the factory-programmed, +120°C, or

+125°C upper trip threshold. T

LOW

is asserted when the

remote temperature exceeds the lower threshold, which is

controlled by pins S1 and S2. The lower thresholds are

available in two ranges in 5°C increments. The two ranges

are +40°C to +80°C and +75°C to +115°C. Hysteresis for

both outputs to be deasserted is typically 5°C.

HIGH

is an open-drain, active-low output for both the

MAX6685 and the MAX6686. T

LOW

is a CMOS push-pull,

active-high output for the MAX6685 and is an open-drain,

active-low output for the MAX6686. They are available in

a space-saving 8-pin µMAX package.

Applications

Features

♦ Pin-Programmed Lower Temperature Threshold

from +40°C to +80°C or +75°C to +115°C

(5°C Increments)

♦ Preset Upper Threshold: +120°C or +125°C

♦ Open-Drain, Active-Low Output for Upper

Temperature Alarm

♦ CMOS Push-Pull, Active-High or Open-Drain,

Active-Low Output for Lower Temperature Alarm

♦ 1.5°C Accuracy

♦ 3.0V to 5.5V, 200µA Supply

♦ 8-Pin µMAX Package

MAX6685/MAX6686

Dual-Output Remote-Junction

Temperature Switches

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

MAX6685

12V

GND

CPU

DXN

3.3V

TO SYSTEM

SHUTDOWN

LOW

DXP

HIGH

MAX6686

GND

CPU

DXN

3.3V

TO SYSTEM

SHUTDOWN

TO CLOCK

THROTTLE

CONTROL

LOW

DXP

HIGH

Typical Operating Circuits

19-2459; Rev 2; 4/03

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

LOW

OUTPUT

LOW

TRIP

RANGE (0°C)

HIGH

TRIP

THRESHOLD (0°C)

PIN-PACKAGE

MAX6685AU40L Push-pull, active high +40°C to +80°C +120°C 8 µMAX

MAX6685AU40H Push-pull, active high +40°C to +80°C +125°C 8 µMAX

MAX6685AU75L Push-pull, active high +75°C to +115°C +120°C 8 µMAX

MAX6685AU75H Push-pull, active high +75°C to +115°C +125°C 8 µMAX

MAX6686AU40L Open drain, active low +40°C to +80°C +120°C 8 µMAX

MAX6686AU40H Open drain, active low +40°C to +80°C +125°C 8 µMAX

MAX6686AU75L Open drain, active low +75°C to +115°C +120°C 8 µMAX

MAX6686AU75H Open drain, active low +75°C to +115°C +125°C 8 µMAX

Pin Configurations appear at end of data sheet.

CPU Temperature

Protection

Fan Control

Multichip Modules

FPGA Temperature

Protection

Summary of content (7 pages)

PAGE 1
9-2459; Rev 2; 4/03 Dual-Output Remote-Junction Temperature Switches Features ♦ Pin-Programmed Lower Temperature Threshold from +40°C to +80°C or +75°C to +115°C (5°C Increments) ♦ Preset Upper Threshold: +120°C or +125°C ♦ Open-Drain, Active-Low Output for Upper Temperature Alarm ♦ CMOS Push-Pull, Active-High or Open-Drain, Active-Low Output for Lower Temperature Alarm ♦ 1.5°C Accuracy ♦ 3.0V to 5.
PAGE 2
MAX6685/MAX6686 Dual-Output Remote-Junction Temperature Switches ABSOLUTE MAXIMUM RATINGS Voltages Referenced to GND VDD, TLOW, THIGH .....................................................-0.3V to +6V DXN .......................................................................-0.3V to +0.8V All Other Pins..............................................-0.3V to (VDD + 0.3V) Input Current .........................................................................5mA Output Current .................................
PAGE 3
Dual-Output Remote-Junction Temperature Switches AVERAGE SUPPLY CURRENT vs. SUPPLY VOLTAGE 140 120 200 10 TEMPERATURE TRIP THRESHOLD ERROR (°C) AVERAGE SUPPLY CURRENT (µA) 160 MAX6685 toc02 250 MAX6685 toc01 180 150 100 50 MAX6685U40H S1 = S2 = GND 8 6 4 2 0 100 25 50 75 100 0 3.0 125 3.5 4.0 4.5 5.5 0 10 SUPPLY VOLTAGE (V) AMBIENT TEMPERATURE (°C) UPPER TEMPERATURE TRIP THRESHOLD ERROR vs. AMBIENT TEMPERATURE 2.0 MAX6685U40H THIGH TRIP = +125°C 1.6 5.0 1.2 0.8 0.
PAGE 4
MAX6685/MAX6686 Dual-Output Remote-Junction Temperature Switches Pin Description PIN MAX6685 MAX6686 NAME FUNCTION 1 1 VDD Power-Supply Input. Bypass to GND with a 0.1µF capacitor. 2 2 GND Ground 3 3 DXP This pin connects to the positive (anode) terminal of the external P-N sense junction. It sources current into the external junction. A 2200pF capacitor should be connected across DXP and DXN. 4 4 DXN This pin connects to the negative (cathode) terminal of the external P-N sense junction.
PAGE 5
Dual-Output Remote-Junction Temperature Switches MAX6685/MAX6686 Table 1.
PAGE 6
MAX6685/MAX6686 Dual-Output Remote-Junction Temperature Switches Pin Configurations Chip Information TRANSISTOR COUNT: 7765 PROCESS: BiCMOS TOP VIEW VDD 1 GND 2 8 S2 VDD 1 7 S1 GND 2 MAX6685 S2 7 S1 MAX6686 3 6 TLOW DXP 3 6 TLOW DXN 4 5 THIGH DXN 4 5 THIGH DXP µMAX 6 8 µMAX _______________________________________________________________________________________
PAGE 7
Dual-Output Remote-Junction Temperature Switches 8 INCHES DIM A A1 A2 b E ÿ 0.50±0.1 H c D e E H 0.6±0.1 L 1 1 α 0.6±0.1 S BOTTOM VIEW D MIN 0.002 0.030 MAX 0.043 0.006 0.037 0.014 0.010 0.007 0.005 0.120 0.116 0.0256 BSC 0.120 0.116 0.198 0.188 0.026 0.016 6∞ 0∞ 0.0207 BSC 8LUMAXD.EPS 4X S 8 MILLIMETERS MAX MIN 0.05 0.75 1.10 0.15 0.95 0.25 0.36 0.13 0.18 2.95 3.05 0.65 BSC 2.95 3.05 4.78 5.03 0.41 0.66 0∞ 6∞ 0.