MAX6513UT___-T中文资料

General Description

The MAX6511/MAX6512/MAX6513 are fully integrated,remote temperature switches that use an external P-N junction (typically a diode-connected transistor) as the sensing element to measure the remote temperature.These devices assert a logic signal when the tempera-ture crosses a factory-programmed threshold. Available trip thresholds are from +45°C to +125°C in 10°C incre-ments. Accuracy is within ±3°C (T A = -5°C to +55°C) or ±5°C (T A = -40°C to +85°C). Hysteresis is pin selec-table to 5°C or 10°C.

The MAX6511 has an active-low CMOS output and the MAX6513 has an active-high CMOS output. The MAX6512 has an open-drain output. The output is asserted when the temperature exceeds the threshold value. The active-low open-drain output is intended to interface with a microprocessor (μP) reset or interrupt input. The active-high CMOS output can directly drive a power FET to control a cooling fan.

The MAX6511/MAX6512/MAX6513 operate from a +3.0V to +5.5V supply and typically consume 400μA of supply current. They are available in a small 6-pin SOT23 package.

________________________Applications

CPU Temperature Monitoring in High-Speed Computers

Multichip Modules Battery Packs

Temperature Control Temperature Alarms Fan Control

Features

o Continuously Measure External Junction Temperature

o Factory-Programmed Temperature Threshold from +45°C to +125°C in 10°C Increments o Insensitive to Series Parasitic Resistance o Active-Low CMOS Output (MAX6511) or Open-Drain Output for Overtemperature Alarm

(MAX6512) or Active-High Output (MAX6513) for Direct Fan Control

o <100ms Response Time

o Accuracy

±3°C (T REMOTE = +45°C to +125°C, T A = -5°C to +55°C)±5°C (T REMOTE = +45°C to +125°C, T A = -40°C to +85°C)o Pin-Selectable 5°C or 10°C Hysteresis o 400μA Average Current Consumption o +3.0V to +5.5V Supply Range o 6-Pin SOT23 Package

MAX6511/MAX6512/MAX6513

Low-Cost, Remote SOT Temperature Switches

________________________________________________________________Maxim Integrated Products

1

MAX6513UT___-T中文资料

MAX6513UT___-T中文资料

Pin Configuration

19-1819; Rev 1; 11/03

Ordering Information

*These parts are offered in nine standard temperature versions with a minimum order of 2500pieces. To complete the suffix infor-mation, select an available trip point in degrees centigrade from the device marking codes table. For example, the

MAX6511UT065-T describes a MAX6511 in a SOT23-6 package with a +65°C threshold.

Typical Operating Circuit appears at end of data sheet.

For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at http://m.wendangku.net/doc/b178ae47852458fb770b56b0.html.

M A X 6511/M A X 6512/M A X 6513

MAX6513UT___-T中文资料

Low-Cost, Remote SOT Temperature Switches 2_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V DD = +3.0V to +5.5V, C S = 2200pF, T A = -40°C to +85°C, T REMOTE = +45°C to +125°C (Note 1), unless otherwise noted. Typical values are at T A = +25°C.) (Note 2)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

REMOTE A MAX6513 package.

Note 2:All parameters are 100% production tested at T A = +25°C. Specifications over temperature limits are guaranteed by design.Note 3:This parameter is guaranteed by design to ±3.5 sigma.

Supply Voltage (V DD )...............................................-0.3V to +6V DXP, DXN, HYST, TOVER (MAX6513),

TOVER (MAX6511/MAX6512)................-0.3V to (V DD + 0.3V)TOVER (MAX6513), TOVER (MAX6511)

Output Current....................................................-1mA/+50mA DXN Input Current...................................................-1mA/+50mA Current (all other pins)......................................................±20mA Continuous Power Dissipation (T A = +70°C)

6-Pin SOT23-6 (derate 9.1mW/°C above +70°C)........727mW

Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Junction Temperature......................................................+150°C Lead Temperature

Vapor Phase (60s).......................................................+215°C Infrared (15s)...............................................................+220°C

MAX6511/MAX6512/MAX6513

Low-Cost, Remote SOT Temperature Switches

_______________________________________________________________________________________3

300

340320380360420400440-40

10

-15

35

60

85SUPPLY CURRENT

vs. AMBIENT TEMPERATURE

MAX6513UT___-T中文资料

AMBIENT TEMPERATURE T A (°C)S U P P L Y C U R R E N T (μA )

-0.40-0.20.2-1.4-1.6

-1.0-1.2-0.8-0.6-60-40-200

20408060100120140

TEMPERATURE TRIP THRESHOLD ERROR

vs. AMBIENT TEMPERATURE T A

MAX6513UT___-T中文资料

AMBIENT TEMPERATURE T A (°C)T E M P E R A T U R E T R I P T H R E S H O L D E R R O R (°C )

-22-40468101214

20

10

30

40

50

60

TEMPERATURE TRIP THRESHOLD ERROR

vs. C S CAPACITANCE

M A X 6511 t o c 03

C S CAPACITANCE (nF)

T E M P E R A T U R E T R I P T H R E S H O L D E R R O R (°C )

-2.0

-0.5-1.0-1.500.51.00

80602040100120140160180200

TEMPERATURE TRIP THRESHOLD ERROR

vs. SERIES RESISTANCE

M A X 6511 t o c 04

SERIES RESISTANCE (?)

T E M P E R A T U R E T R I P T H R E S H O L D E R R O R (°C )

3.0

4.0

3.5

4.5

5.0

5.5

TEMPERATURE TRIP THRESHOLD

vs. SUPPLY VOLTAGE

MAX6513UT___-T中文资料

SUPPLY VOLTAGE (V)

-1.8

-0.40-0.20.20.4

-1.4-1.6-1.0-1.2-0.8-0.6T E M P E R A T U R E T R I P T H R E S H O L D E R R O R (°C )

Typical Operating Characteristics

(V DD = +3.3V, C S = 2200pF, T A = +25°C, unless otherwise noted.)

Detailed Description

The MAX6511/MAX6512/MAX6513 fully integrated tem-perature switches incorporate a precision bandgap ref-erence, a conversion block, a current source, and a comparator (Figure 1). These devices use an external P-N junction as the temperature-sensing element. They steer bias currents through the external diode, measure the forward voltages, and compute the temperature using a precision chopper stabilized amplifier.

Resistance values of less than 100?in series with the external sense junction will result in trip-point errors <1°C. The MAX6511/MAX6512/MAX6513 provide noise immunity by integration and oversampling of the diode voltage, but good design practice includes routing the DXP and DXN lines away from noise sources, such as high-speed digital lines, switching regulators, induc-tors, and transformers. The DXP and DXN traces should be paired together and surrounded by ground plane whenever possible.

In applications where the temperature changes rapidly,the measured temperature will be approximately equal to the average value of the temperature during the measurement period.

The MAX6512 has an active-low, open-drain output struc-ture that can only sink current. The MAX6511 has an active-low CMOS output structure, and the MAX6513 has an active-high CMOS output.

The MAX6511/MAX6512/MAX6513 are available with preset temperature thresholds from +45°C to +125°C in 10°C increments.

M A X 6511/M A X 6512/M A X 6513

Low-Cost, Remote SOT Temperature Switches 4

MAX6513UT___-T中文资料

MAX6513UT___-T中文资料

_______________________________________________________________________________________

Pin Description

Figure 1. Functional Block Diagram

Hysteresis Input

The HYST pin is a CMOS-compatible input that selects hysteresis at either a high level (10°C for HYST = V DD )or a low level (5°C for HYST = GND). Hysteresis pre-vents the output from chattering when the temperature is near the trip point. The HYST pin must not float.

The output asserts when the temperature exceeds the trip point and deasserts when the temperature falls back below the trip point minus the hysteresis. For example, if the trip point is 105°C, the output will assert at 105°C and will not deassert until temperature falls below 105°C minus the hysteresis (e.g., 95°C if 10°C hysteresis is chosen) (Figure 2).

Applications Information

Remote-Diode Selection

To ensure best accuracy, use a good-quality diode-connected transistor. Suggested devices are listed in Table 1. Large power transistors are not recommend-ed. Tight specifications for forward current gain indi-

cate the manufacturer has good process controls and that the devices have consistent V be characteristics.The MAX6511/MAX6512/MAX6513 can also measure the die temperature of CPUs and other integrated cir-cuits having on-board temperature-sensing http://m.wendangku.net/doc/b178ae47852458fb770b56b0.htmle the monitor ’s output to reset the μP, assert an inter-rupt, activate a cooling fan, or trigger an external alarm.

Noise Filtering Capacitors

A quality ceramic capacitor must be connected across the DXP/DXN inputs to maintain temperature threshold accuracy by filtering out noise. The capacitor should be located physically close to the DXP/DXN pins and should typically have a value of 2200pF. Larger capaci-tor values can cause temperature measurement errors.A 50% variation from the recommended capacitor value can cause up to ±1°C error.

MAX6511/MAX6512/MAX6513

Low-Cost, Remote SOT Temperature Switches

_______________________________________________________________________________________5

Figure 2. Temperature Trip Threshold Hysteresis

MAX6513UT___-T中文资料

MAX6513UT___-T中文资料

M A X 6511/M A X 6512/M A X 6513

MAX6513UT___-T中文资料

MAX6513UT___-T中文资料

MAX6513UT___-T中文资料

Low-Cost, Remote SOT Temperature Switches 6_______________________________________________________________________________________

Typical Operating Circuit

Chip Topography

TRANSISTOR COUNT: 3300

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________7?2003 Maxim Integrated Products

Printed USA

is a registered trademark of Maxim Integrated Products.

MAX6511/MAX6512/MAX6513

Low-Cost, Remote SOT Temperature Switches

MAX6513UT___-T中文资料

Package Information

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to http://m.wendangku.net/doc/b178ae47852458fb770b56b0.html/packages .)

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