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TMP300AIDBVT Fiches technique(PDF) 7 Page - Texas Instruments |
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TMP300AIDBVT Fiches technique(HTML) 7 Page - Texas Instruments |
7 / 20 page R INT 210kW R SET T SET OUT V+ HYST SET V TEMP TMP300 3 A m Proportional toT A Open-DrainControl Voltagesource totesttrippoint. R ink = W SET 10(50+T ) SET 3 R = SET (T 0.01+0.5) ´ SET 3e- 6 TMP300 www.ti.com SBOS335D – JUNE 2005 – REVISED JANUARY 2016 6 Detailed Description 6.1 Overview The TMP300 is a thermal sensor designed for over-temperature protection circuits in electronic systems. The TMP300 uses a set resistor to program the trip temperature of the digital output. An additional high-impedance (210k Ω) analog voltage output provides the temperature reading. 6.2 Feature Description 6.2.1 Calculating RSET The set resistor (RSET) provides a threshold voltage for the comparator input. The TMP300 trips when the VTEMP pin exceeds the TSET voltage. The value of the set resistor is determined by the analog output function and the 3 μA internal bias current. To set the TMP300 to trip at a preset value, calculate the RSET resistor value according to Equation 1 or Equation 2: where • TSET is in °C; or (1) where • TSET is in °C. (2) 6.2.2 Using VTEMP to Trip the Digital Output The analog voltage output can also serve as a voltage input that forces a trip of the digital output to simulate a thermal event. This simulation facilitates easy system design and test of thermal safety circuits, as shown in Figure 8. Figure 8. Applying Voltage to Trip Digital Output Copyright © 2005–2016, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: TMP300 |
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