19-1617; Rev 2; 11/03 Resistor-Programmable SOT Temperature Switches ____________________________Features ♦ ±0.5°C Threshold Accuracy ♦ ±4.7°C (max) Threshold Accuracy (-40°C to +125°C) ♦ Temperature Threshold Set by a 1% External Resistor ♦ Set-Hot or Set-Cold Option ♦ Low 32µA Supply Current ♦ Open-Drain, Push-Pull Outputs; Open-Drain with Internal Pull-Up Resistor ♦ Pin-Selectable 2°C or 10°C Hysteresis ♦ SOT23 Packages Ordering Information ________________________Applications µP Temperature Monitoring in High-Speed Computers Temperature Control Temperature Alarms Fan Control Automotive TEMP. RANGE PINPACKAGE TOP MARK MAX6509CAUK-T -40°C to +125°C 5 SOT23-5 ADNT MAX6509HAUK-T -40°C to +125°C 5 SOT23-5 ADNU MAX6510CAUT-T** -40°C to +125°C 6 SOT23-6 AAHA MAX6510HAUT-T** -40°C to +125°C 6 SOT23-6 AAHB PART* *A minimum order of 2500 pc. is required for SOT packages. **See Table 1 for selectable output options. Typical Operating Circuit +2.7V TO +5.5V Pin Configurations TOP VIEW 0.1µF VCC VCC SET MAX6509 OUT MAX6510 (OUT) RSET (OUTSET) GND HYST 5 VCC SET 1 INT µP GND 2 MAX6509 SET 1 GND 2 6 VCC MAX6510 5 OUTSET GND GND 4 HYST OUT 3 SOT23-5 OUT, OUT 3 4 HYST SOT23-6 ( ) ARE FOR MAX6510. ________________________________________________________________ Maxim Integrated Products 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. 1 MAX6509/MAX6510 ________________General Description The MAX6509/MAX6510 are fully integrated, resistorprogrammable temperature switches with thresholds set by an external resistor. They require only one external resistor to set the temperature threshold within a wide -40°C to +125°C temperature range. The MAX6509 provides an open-drain output. The MAX6510 features three selectable output options: active-low, active-high, and open drain with an internal pull-up resistor. These switches operate with a +2.7V to +5.5V single supply while providing a temperature threshold accuracy of ±0.5°C (typ) or ±4.7°C (max). They typically consume 32µA supply current. Hysteresis is pin selectable to 2°C or 10°C. The MAX6509/MAX6510 are available in 5-pin and 6-pin SOT23 packages, respectively. MAX6509/MAX6510 Resistor-Programmable SOT Temperature Switches ABSOLUTE MAXIMUM RATINGS Reference to GND Supply Voltage (VCC).................-0.3V to +6V OUT (MAX6509) ....................................................-0.3V to +6V OUT, OUT (MAX6510).............................-0.3V to (VCC + 0.3V) SET, HYST, OUTSET ..................................-0.3V to (VCC + 0.3V) Output Current (all pins) .....................................................20mA Input Current (all pins) ........................................................20mA Continuous Power Dissipation (TA = +70°C) 5-Pin SOT23 (derate 7.1mW/°C above +70°C).............571mW 6-Pin SOT23 (derate 8.7mW/°C above +70°C).............696mW Operating Temperature Range .........................-40°C to +125°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C 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. ELECTRICAL CHARACTERISTICS (VCC = +2.7V to +5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Supply Voltage Range Supply Current SYMBOL CONDITIONS TYP 2.7 VCC ICC MIN ∆TTH Temperature Threshold Hysteresis THYST 5.5 V 32 50 OUTSET = GND or VCC (MAX6510) 47 80 µA µA 97 165 TA = 0°C to +125°C ±0.5 ±4.7 TA = -40°C to 0°C ±0.5 ±3.7 HYST = GND 2 HYST = VCC 10 µA VCC - 0.4 VIH 0.4 VIL OUT Impedance to VCC OUTSET = unconnected (MAX6510) 60 °C °C 1 HYST Input Leakage HYST Input Threshold UNITS MAX6509 OUTSET = unconnected, OUT = low Temperature Threshold Accuracy MAX 100 160 VCC - 0.4 V kΩ Output Voltage High VOH IOUT = 5mA, OUTSET = GND or VCC Output Voltage Low VOL IOUT = 5mA 0.3 V Open-Drain Output Leakage Current IOUT VOUT = VCC (MAX6509) 10 µA 0.2 · VCC OUT, active low OUTSET Voltage OUTSET Current VOUTSET IOUTSET MAX6510 MAX6510 OUT, active high 0.85 · VCC OUT, open drain 0.72 · VCC V 0.55 · VCC VOUTSET = GND -5.5 VOUTSET = VCC 5.5 OUTSET = unconnected Note 1: 100% production tested at TA = +25°C. Specifications over temperature limits are guaranteed by design. 2 V _______________________________________________________________________________________ µA ±0.1 Resistor-Programmable SOT Temperature Switches RSET vs. TEMPERATURE (TA = -40°C TO 0°C) SUPPLY CURRENT vs. TEMPERATURE VCC = +5V 150 140 VCC = +3.3V RSET (kΩ) 35 30 VCC = +2.7V 25 130 120 110 20 100 RSET = 0 OUTSET = GND (MAX6510) 10 -50 -25 0 25 90 50 75 100 125 -40 -35 -30 TEMPERATURE (°C) -20 -15 -10 -5 0 TRIP THRESHOLD OFFSET vs. TEMPERATURE RSET vs. TEMPERATURE (TA = 0°C TO +125°C) 0.20 90 80 70 60 50 40 30 0.15 SET POINT OFFSET (°C) MAX6509/10 toc03 100 RSET (kΩ) -25 TEMPERATURE (°C) VCC = +2.7V 0.10 MAX6509/10 toc04 15 VCC = +3.3V VCC = +5V 0.05 0 -0.05 VCC = +3.3V -0.10 20 -0.15 VCC = +2.7V 10 -0.20 0 0 20 40 60 80 100 120 -50 140 -25 TRIP POINT ERROR vs. SET TEMPERATURE MAX6509/10 toc05 0.8 50 75 100 125 HYSTERESIS vs. TEMPERATURE VCC = +5V 1% RSET SET RESISTOR TEMPCO 0.9 25 TEMPERATURE (°C) TEMPERATURE (°C) 1.0 0 12 MAX6509/10 toc06 SUPPLY CURRENT (µA) 40 MAX6509/10 toc02 45 160 MAX6509/10 toc01 50 HYST = VCC 10 HYSTERESIS (°C) ERROR (°C) 0.7 0.6 0.5 RSET 0.4 200ppm 100ppm 0.3 8 6 4 HYST = GND 0.2 2 0.1 50ppm 0 -40 -25 0 25 50 75 TEMPERATURE (°C) 100 125 0 -40 -25 0 25 50 75 100 125 TEMPERATURE (°C) _______________________________________________________________________________________ 3 MAX6509/MAX6510 __________________________________________Typical Operating Characteristics (VCC = +5V, RPULL-UP = 10kΩ (MAX6509 only), TA = +25°C, unless otherwise noted.) Resistor-Programmable SOT Temperature Switches MAX6509/MAX6510 Pin Description PIN NAME FUNCTION 1 SET Temperature Set Point. Connect an external 1% resistor from SET to GND to set trip point. 2 2 GND Ground 3 — OUT Open-Drain Output. Reset to high impedance during power-on. — 3 OUT, OUT Open-Drain with Internal Pull-Up Resistor, Active-High, or Active-Low Output. See Table 1. Reset to deassert during power-on. 4 4 HYST Hysteresis Selection. Hysteresis is 10°C for HYST = VCC, 2°C for HYST = GND. 5 6 VCC MAX6509 MAX6510 1 — 5 OUTSET Power-Supply Input Trilevel Control Input: OUTSET = VCC sets OUT to active high. OUTSET = GND sets OUT to active low. OUTSET = Unconnected sets OUT to open drain with internal pull-up resistor. Detailed Description The MAX6509/MAX6510 fully integrated temperature switches incorporate two temperature-dependent references and one comparator. One reference exhibits a positive temperature coefficient, and the other has a negative temperature coefficient. The temperature at which the two reference voltages are equal determines the temperature trip point. Pin-selectable 2°C or 10°C hysteresis keeps the output from oscillating when the temperature is close to the threshold. The MAX6509 has an active-low, open-drain output structure that can only sink current. The MAX6510 has three different output options from which to choose (Table 1). The MAX6509/MAX6510 are programmable for a wide range of temperature thresholds from -40°C to +125°C. The temperature threshold is set by an external resistor between SET and GND. The MAX6509 output easily interfaces with a microprocessor (µP) reset input (Figure 2). The MAX6510 output is intended for applications such as driving a fan control switch (Figure 3). Table 1. OUTSET-Selectable Outputs 4 Hysteresis Input The HYST pin is a CMOS-compatible input that selects hysteresis at either a high level (10°C for HYST = VCC) or a low level (2°C for HYST = GND). Hysteresis prevents the output from oscillating when the temperature is near the trip point. Do not leave HYST unconnected. Connect HYST to GND or VCC. Other input voltages cause increased supply current. Choose the set-hot temperature (H) or set-cold temperature (C) option to ensure that the trip point is accurate and the hysteresis is in the right direction. A MAX6509 or MAX6510 with the H suffix will first trip at the correct point when temperature is increasing. For example, a MAX6509HAUK-T or MAX6510HAUT-T with its trip point set to 100°C will assert when its temperature rises above +100°C, and will not deassert until its temperature drops below +100°C minus the selected hysteresis value (e.g., +98°C if 2°C hysteresis is chosen). Conversely, if the trip temperature of a MAX6509CAUK-T or MAX6510CAUT-T is -40°C, the output asserts at -40°C as temperature falls, and deasserts when temperature rises above -40°C plus the hysteresis value (e.g., -38°C if 2°C hysteresis is chosen) as shown in Figure 4. OUTSET OUT Connected to VCC Active high Output Selection Connected to GND Active low Unconnected Open drain with internal pull-up resistor The MAX6509 provides an open-drain output. The MAX6510 features three output options selectable by OUTSET (Table 1). _______________________________________________________________________________________ Resistor-Programmable SOT Temperature Switches MAX6509/MAX6510 OUT MAX6509 WITH A PULL-UP RESISTOR V OUT NEGATIVE TEMPCO REFERENCE POSITIVE TEMPCO REFERENCE HYST NETWORK HYST TTH TEMP HYSTERESIS* MAX6509HAUK-T MAX6510 V OUT OUT NEGATIVE TEMPCO REFERENCE POSITIVE TEMPCO REFERENCE OUTSET = VCC HYST NETWORK HYST TTH TEMP HYSTERESIS* MAX6510HAUT-T OUT MAX6509 WITH A PULL-UP RESISTOR V OUT NEGATIVE TEMPCO REFERENCE POSITIVE TEMPCO REFERENCE HYST NETWORK HYST TEMP TTH HYSTERESIS* MAX6509CAUK-T MAX6510 OUT OUT NEGATIVE TEMPCO REFERENCE POSITIVE TEMPCO REFERENCE HYST NETWORK HYST OUTSET = VCC MAX6510CAUT-T TTH TEMP HYSTERESIS* *HYSTERESIS IS 10°C FOR HYST = VCC AND 2°C FOR HYST = GND. Figure 1. Block and Functional Diagrams _______________________________________________________________________________________ 5 MAX6509/MAX6510 Resistor-Programmable SOT Temperature Switches +3.3V +5V VCC RPULL-UP 100k VCC µP µP MAX6509 INT SHUTDOWN OR RESET OUT HEAT VCC OUTSET VCC HYST HEAT SET GND HYST SET MAX6510 GND FAN RSET OUT RSET Figure 2. Microprocessor Alarm/Reset Figure 3. Overtemperature Fan Control Applications Information 100°C T THRESHOLD = 65°C 98°C TEMPERATURE -38°C THYST = 2°C Thermal Considerations The MAX6509/MAX6510 supply current is typically 32µA. When used to drive high-impedance loads, the devices dissipate negligible power; therefore, the die temperature is essentially the same as the package temperature. The key to accurate temperature monitoring is good thermal contact between the MAX6509/ MAX6510 package and the device being monitored. In some applications, the SOT23-5 and SOT23-6 packages may be small enough to fit underneath a socketed µP, allowing the device to monitor the µP’s temperature directly. Use the monitor’s output to reset the µP, assert an interrupt, or trigger an external alarm. Accurate temperature monitoring depends on the thermal resistance between the device being monitored and the MAX6509/MAX6510 die. The rise in die temperature due to self-heating is given by the following formula: ∆TJ = PDISS · θJA where P DISS is the power dissipated by the MAX6509/MAX6510, and θJA is the package’s thermal resistance. The typical thermal resistance is 115°C/W for the SOT23-6 package. To limit the effects of selfheating, minimize the output currents. For example, if the MAX6510 sinks 5mA, the output voltage is guaranteed to be less than 0.3V; therefore, an additional 1.5mW of power is dissipated within the IC. This corresponds to a 0.173°C shift in the die temperature in the SOT23-6. Temperature-Window Detector The MAX6509/MAX6510 temperature switch outputs assert when the die temperature is outside the programmed range. Combining the outputs of a set-cold 6 -40°C T THRESHOLD = -10°C OUT SET HOT MAX6509H 100°C 98°C OUT SET COLD MAX6510C OUTSET = GND -40°C -38°C Figure 4. Temperature Response and a set-hot device creates an over/undertemperature detector. The MAX6509/MAX6510 are designed to form two complementary pairs, each containing one cold trip point output and one hot trip point output. The assertion of either output alerts the system to an out-of-range temperature. The MAX6510 push-pull output stages can be ORed to produce a thermal out-of-range alarm. More favorably, a MAX6509HAUK-T and MAX6509CAUK-T can be directly wire-ORed with a single external resistor to accomplish the same task (Figure 5). The temperature window (alarms or detectors as in Figure 5) can be used to accurately determine when a device’s temperature falls out of a programmed range, for example -3°C to +75°C as shown in Figure 5. The thermal overrange signal can be used to assert a ther- _______________________________________________________________________________________ Resistor-Programmable SOT Temperature Switches MAX6509/MAX6510 +5V +5V VCC MAX6510HAUT GND VCC RSET 30k HYST OUTSET MAX6510HAUT HEAT OVERTEMP OUT OF RANGE HYST VCC SET RSET 30k µP OUT VCC TEMPERATURE FAULT OUT GND OUT VCC OUTSET UNDERTEMP MAX6509CAUT OUTSET HYST SET GND VCC HEAT VCC RSET 100k OUTSET VCC MAX6510HAUT SET RSET 55k RPULL-UP 100k VCC GND OUT OF RANGE Figure 6. Low-Power, High-Reliability, Fail-Safe Temperature Monitor VCC OUT OUT HYST +5V RSET 30k FAN CONTROL OUT Set-Point Resistor MAX6509HAUK MAX6509CAUK GND GND HYST SET HYST RSET 100k Figure 5. Temperature-Window Detector mal shutdown, power-up, recalibration, or other temperature-dependent function. Low-Cost, Fail-Safe Temperature Monitor In high-performance/high-reliability applications, multiple temperature monitoring is important. The high-level integration and low cost of the MAX6509/MAX6510 facilitate the use of multiple temperature monitors to increase system reliability. Figure 6 shows two MAX6510s with different temperature thresholds. This ensures that fault conditions that can overheat the monitored device cause no permanent damage. The first temperature monitor activates the fan when the die temperature exceeds +45°C. The second MAX6510 triggers a system shutdown if the die temperature reaches +75°C. The second temperature monitor’s output asserts when a wide variety of destructive fault conditions occur, including latchups, short circuits, and cooling-system failures. To set the trip-point temperature, connect a resistor between SET and GND. The resistor’s value is determined either from the RSET vs. Temperature graphs (see Typical Operating Characteristics) or from the equations below. To set the temperature trip point from -40°C to 0°C, use the following equation: RSET(kΩ) = [(1.3258 · 105) / (T+1.3)] - 310.1693 [(5.7797 · 106) / (T+1.3)2] To set the temperature trip point from 0°C to +125°C, use the following equation: RSET(kΩ) = [(8.3793 · 104) / T] - 211.3569 + [(1.2989 · 105) / T2] where T is the trip temperature in Kelvin. Chip Information TRANSISTOR COUNT: 234 _______________________________________________________________________________________ 7 SOT-23 5L .EPS ________________________________________________________Package Information PACKAGE OUTLINE, SOT-23, 5L 21-0057 E 1 1 6LSOT.EPS MAX6509/MAX6510 Resistor-Programmable SOT Temperature Switches PACKAGE OUTLINE, SOT-23, 6L 21-0058 F 1 1 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. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.