SNIS218A September 2019 – April 2020 TMP390-Q1
SETA sets the +90°C threshold using 78.7 kΩ. SETB sets the –25°C trip point and 10°C hysteresis using 215 kΩ. These values were determined using Table 1 and Table 2. These resistors should have maximum of 1% tolerance and 100 ppm/°C or less over the desired temperature range. A summary of the resistor settings used in this example is shown in Table 3. See Table 1 and Table 2 for additional trip points and hysteresis configurations.
The switching output of the TMP390-Q1 can be visualized with the output diagram shown in Figure 12. It is key to notice that hysteresis is subtracted from the Channel A threshold and added to the Channel B threshold values. OUTA remains high until the sensor reaches +90°C where the output goes low, and returns high after the temperature drops back down to +80°C. OUTB trips when the temperature stays below –25°C and goes low until the temperature rises above –15°C.
|CHANNEL||RESISTOR SETTING (kΩ)||HYSTERESIS (°C)||TRIP TEMPERATURE (°C)|