SNIS218A September 2019 – April 2020 TMP390-Q1
The TMP390-Q1 requires two resistors to set the two trip points and hysteresis, according to Table 1 and Table 2, for the hot and cold channel device. The output of the TMP390-Q1 is open-drain and requires two pullup resistors. TI recommends to use a pullup voltage supply that does not exceed VDD + 0.3 V. The pullup resistors used in between the OUTA and OUTB pins and the pullup supply should be greater than 1 kΩ. The device powers on when the supply voltage goes beyond 1.5 V, and starts sampling the input resistors to set the two trip points and hysteresis value after power-on. These values will remain the same until the device goes through a power cycle. After the device sets the trip points and hysteresis level, the device will update the output every half a second. The conversion time is typically 0.65 ms when the temperature is checked against the trip points and the outputs are updated. The device remains in standby mode between conversions. If either channel is not used, the output can be grounded or left floating.