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
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 https://www.wendangku.net/doc/b81784815.html,.
M A X 6511/M A X 6512/M A X 6513
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
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300
340320380360420400440-40
10
-15
35
60
85SUPPLY CURRENT
vs. AMBIENT TEMPERATURE
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
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
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
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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 https://www.wendangku.net/doc/b81784815.html,e 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
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Figure 2. Temperature Trip Threshold Hysteresis
M A X 6511/M A X 6512/M A X 6513
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
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 https://www.wendangku.net/doc/b81784815.html,/packages .)