Other Parts Discussed in Thread: TMP300, TMP107
Customer requested an automatic temperature trip point in each of their digital modules, to force a heating of the processor when the temperature is below a set point like −35°C for instance. This heating must occur before anything else. So the setting is from a non-volatile digital potentiometer: TLP0102‑100. Original idea was to use a TMP300 switch thermometer, but it is not accurate enough. The LM57 has a much more accurate trip point. But for that low temperature range its RSENSE calls for much higher resistances than what the non-volatile digital potentiometer can provide.
After reading the LM57 datasheet it is unclear on how he could set the trip point of the device with a voltage instead of a sense resistor. Please let me know if this is feasible or if you can recommend another temp sensor that would work here? Also, is there a TINA model that can be used to simulate the design?
Thanks & regards, John Garrett, TI-AFA