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ST3115 Application

Nick102
Associate

‎2024-07-02 11:18 AM - last edited on ‎2024-07-02 11:29 AM by

Nick102_0-1719944250883.png

I do not understand where BATD is connected to? Is it connected to the negative end of the battery? I am using a single cell battery with only 2 terminals but this seems to imply there are 3 battery terminals.

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Peter BENSCH
ST Employee

‎2024-07-02 12:24 PM

Well, the function of BATD is actually described in detail in the data sheet: the presence of the battery is checked via the pin for batteries with integrated Rid, which can also be a thermistor. If you only have a two-pole single cell battery, you can of course neither measure its temperature nor check its presence and should connect BATD to GND via a resistor - not directly to GND, because the pin can be connected internally to VDD, which would lead to a short circuit.

Does it answer your question?

Regards
/Peter

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