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TMP300BIDBVR Scheda tecnica(PDF) 8 Page - Texas Instruments |
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TMP300BIDBVR Scheda tecnica(HTML) 8 Page - Texas Instruments |
8 / 20 page -50 -25 0 1.00 0.75 0.50 0.25 0 -0.25 -0.50 -0.75 -1.00 25 50 75 100 125 Temperature( C) ° 210kW T SET OUT V+ HYST SET V TEMP TMP300 3 A m Proportional toT A AnalogOut OPA335 TMP300 SBOS335D – JUNE 2005 – REVISED JANUARY 2016 www.ti.com Feature Description (continued) 6.2.3 Analog Temperature Output The analog out or VTEMP pin is high-impedance (210kΩ). Avoid loading this pin to prevent degrading the analog out value or trip point. Buffer the output of this pin when used for direct thermal measurement. Figure 9 shows buffering of the analog output signal. Figure 9. Buffering the Analog Output Signal 6.2.4 Using a DAC to Set the Trip Point The trip point is easily converted by changing the digital-to-analog converter (DAC) code. This technique can be useful for control loops where a large thermal mass is being brought up to the set temperature and the OUT pin is used to control the heating element. The analog output can be monitored in a control algorithm that adjusts the set temperature to prevent overshoot. Trip set voltage error versus temperature is shown in Figure 10, which shows error in °C of the comparator input over temperature. An alternative method of setting the trip point by using a DAC is illustrated in Figure 11. Figure 10. Trip Set Voltage Error vs Temperature 8 Submit Documentation Feedback Copyright © 2005–2016, Texas Instruments Incorporated Product Folder Links: TMP300 |
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