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MAX6511UT075 Datasheet(PDF) 4 Page - Maxim Integrated Products |
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MAX6511UT075 Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 8 page 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 Ω 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. Low-Cost, Remote SOT Temperature Switches 4 _______________________________________________________________________________________ Pin Description PIN MAX6511 MAX6512 MAX6513 NAME FUNCTION 11 VDD Power-Supply Input, +3.0V to +5.5V. Bypass VDD to GND with a 0.1µF capacitor. 22 GND Ground 33 HYST Hysteresis Selection. Hysteresis is 10°C for HYST = VDD, 5 °C for HYST = GND. 4— TOVER CMOS Active-Low Output (MAX6511) or Open-Drain Active-Low Output (MAX6512). TOVER goes low when the temperature exceeds the factory- programmed temperature threshold. This pin can only sink current in the MAX6512. —4 TOVER CMOS Active-High Output (MAX6513). TOVER goes high when the temperature exceeds the factory-programmed temperature threshold. 55 DXN This pin connects to the negative (cathode) terminal of the external P-N sense junction. DXN must be connected to GND. 66 DXP This pin connects to the positive (anode) terminal of the external P-N sense junction. DXP DXN TEMPERATURE CONVERSION BANDGAP VOLTAGE REFERENCE COMPAR- ATOR LATCH TOVER Figure 1. Functional Block Diagram |
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