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LIV4F actual VBAT range

Vane
Associate II

What is the actual backup input supply voltage range for Teseo LIV4F receivers? Datasheet says that it is 3-3.63V which is really high and doesn't make sense to add any Lithium battery as a backup supply because it will very quickly drop below 3V at the beginning of operation (CR2032/CR1220). But X-NUCLEO-LIV4A1 (https://www.st.com/resource/en/data_brief/x-nucleo-liv4a1.pdf) has a place for CR2032 battery socket and even diode D2 in series on which will be some extra voltage drop. So the question is it a mistake in board design or the actual minimum VBAT voltage is less than it's written in the datasheet? In the second case, it's a drawback of these receivers, at least for my use-case.

1 ACCEPTED SOLUTION

Accepted Solutions
GalaxyQuest
ST Employee

LIV4F VBAT can operate down to 2.1V.


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4 REPLIES 4
GalaxyQuest
ST Employee

I believe there is a margin that will allow for VBAT to dip below 3V.

Please give me a day or two to confirm this.


In order to give better visibility on the answered topics, please click on 'Accept as Solution' on the reply which solved your issue or answered your question.

Thanks! It would be nice to check. If it can operate at 2.5V, it will be sufficient for use with lithium batteries.

GalaxyQuest
ST Employee

LIV4F VBAT can operate down to 2.1V.


In order to give better visibility on the answered topics, please click on 'Accept as Solution' on the reply which solved your issue or answered your question.

Thank you! That's very nice.