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MAX6518UKN005 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX6518UKN005 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 10 page Low-Cost, Fail-Safe Temperature In high-performance/high-reliability applications, multi- ple temperature monitoring is important. The high-level integration and low cost of the MAX6516 and MAX6518 facilitate the use of multiple temperature monitors to increase system reliability. The application in Figure 3 uses two MAX6516s with different hot temperature thresholds to ensure 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 MAX6516 triggers a system shutdown if the die temperature reaches +75°C, preventing damage from a wide variety of destructive fault conditions, including latchups, short circuits, and cooling-system failures. PC Board Testing The MAX6516–MAX6519 temp sensor devices can be tested after PC board assembly using OUT. Testing can be used to verify proper assembly and functionality of the temperature protection circuitry. Since OUT has a weak drive capability, the voltage at OUT can be forced to cause the digital outputs to change states, thereby verifying that the internal comparators and out- put circuitry function properly after assembly. Below is a test procedure that can be used to test the MAX6516–MAX6519: • Power up the device, measure OUT, and observe the state of the logic output. Low-Cost, 2.7V to 5.5V, Analog Temperature Sensor Switches in a SOT23 6 _______________________________________________________________________________________ MAX6516UKP075 VCC HYST GND TOVER TUNDER MAX6516UKN005 VCC HYST GND 5V OVERTEMP UNDERTEMP OUT OF RANGE OUT OUT Figure 1. Temperature-Window Alarms Using the MAX6516 MAX6517UKP075 MAX6517UKN005 VCC GND TUNDER VCC 5V GND HYST HYST OUT TOVER OUT 100k Ω OUT OF RANGE Figure 2. Temperature Window Alarm Using the MAX6517 MAX6516UKP075 GND 5V HYST OUT TOVER SYSTEM SHUTDOWN VCC MAX6516UKP045 GND OUT TOVER FAN CONTROL VCC HYST GND μP HEAT HEAT Figure 3. Low-Power, High-Reliability, Fail-Safe Temperature Monitor |
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