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MAX6519UKN035 Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX6519UKN035 Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 10 page Detailed Description The MAX6516–MAX6519 fully integrated temperature switches incorporate a fixed reference, an analog tem- perature sensor, and a comparator. The temperature at which the two reference voltages are equal determines the temperature trip point. OUT is an analog voltage that varies with the die’s temperature. Pin-selectable 2°C or 10°C hysteresis keeps the digital output from oscillating when the die temperature approaches the threshold temperature. The MAX6516 and MAX6518 have an active-high, push-pull output structure that can sink or source current. The MAX6517 and MAX6519 have an active-low, open-drain output structure that can only sink current. The internal power-on reset cir- cuit guarantees the logic output is at its +25°C state for at least 50µs. Analog Output OUT is an analog output that is proportional to the die temperature. OUT voltage range is between 0.77V to 2.59V, within the temperature range of -45°C to +125°C. For applications with a switching threshold of -45°C, the supply voltage must be greater than 4.5V. The temperature-to-voltage transfer function is approxi- mately linear and can be described by the quadratic equation: VOUT = 1.8015 - 10.62mV (T - 30) + 1.1µV (T - 30) 2 where T = temperature in °C. In most cases, a linear approximation can be applied: VOUT = 1.8015 - 10.62mV (T - 30) Therefore, Hysteresis Input The HYST input selects the devices’ temperature hys- teresis and prevents the output from oscillating when the temperature approaches the trip point. Connect HYST to VCC for 2°C hysteresis or to GND for 10°C hysteresis. Logic Temperature Indicators Overtemperature Indicator (Hot Thresholds) TOVER and TOVER designations apply to thresholds above TA = +25°C (+35°C, +45°C, +55°C, +65°C, +75°C, +85°C, +95°C, +105°C, +115°C). All “hot” thresholds are positive temperatures. The overtemperature indicator output is open-drain active low (TOVER) or push-pull active high (TOVER). TOVER goes low when the die temperature exceeds the factory-programmed temperature threshold. TOVER should be pulled up to a voltage no greater than 5.5V with a 100k Ω pullup resistor. TOVER is a push-pull active-high CMOS output that goes high when the die temperature exceeds the factory-programmed temper- ature threshold. Undertemperature Indicator (Cold Thresholds) TUNDER and TUNDER designations apply to thresholds below TA = +25°C (+15°C, +5°C, -5°C, -15°C, -25°C, -35°C, -45°C). The undertemperature indicator output is open drain, active low (TUNDER), or push-pull active high (TUNDER). TUNDER goes low when the die tem- perature goes below the factory-programmed tempera- ture threshold. TUNDER should be pulled up to a voltage no greater than 5.5V with a 100k Ω pullup resis- tor. TUNDER is a push-pull active-high CMOS output that goes high when the die temperature falls below the factory-programmed temperature threshold. Applications Information Temperature-Window Alarm The MAX6516/MAX6518 logic outputs assert when the die temperature is outside the factory-programmed range. Combining the outputs of two devices creates an over/undertemperature alarm. Two MAX6516s or two MAX6518s are used to form two complementary pairs, 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 MAX6516 push-pull output stages can be ORed to produce a thermal out-of-range alarm (Figure 1). More favorably, two MAX6517s or two MAX6519s can be directly wire-ORed with a single external resistor to accomplish the same task. The temperature window alarms shown in Figure 2 can be used to accurately determine when a device’s temperature falls out of the -5°C to +75°C range. The thermal overrange signal can be used to assert a thermal shutdown, power-up, recalibration, or other temperature-dependent function. T V C OUT =+ ° − 1 8015 0 01062 30 . . Low-Cost, 2.7V to 5.5V, Analog Temperature Sensor Switches in a SOT23 _______________________________________________________________________________________ 5 |
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