I am looking for a on-chip temperature-sensing of the BF609.
And there is the built in thermal diode. (Pins: SYS_TDA, SYS_TDK).
Now I come to two questions:
- Lets say the temperature sensor IC (in my case the max6698) senses a "high temperature" on the BF-die and consequently I shut down the BF-powersupply.
Is it possible that there is some kind of a latchup?
This because the temperature-sensing-IC will force its current (some hundreds of mikroamps) into the two pins of
the BF - and the temperature sensor IC is NOT affected from the Vcc-Shutdown.
- In my sensing-IC datasheet they are using a Base-Emitter-Diode of a Collector-Base-shorted NPN.
The BF-datasheet talks about a grounded-collector Emitter-Base-Diode of a PNP.
Will they be the same? That's the reason for the ideality-factor (which is in case of the BF609: n=1.006 ?!)
Thank you very much! Greetings from Hamburg,