VBAT input voltage in VBAT Requirements of sbRIO-9651(SOM) should support less Voltage.
SPECIFICATIONS NI sbRIO-9651
http://www.ni.com/pdf/manuals/376962b.pdf
VBAT is for keeping the time on RTC.
Minimum of VBAT input voltage in specification is 2.875V.
In general, the button cell is used to keep time like a Mother board of PC.
For example, CR type Lithium button cell has Nomal voltage 3V and End-point voltage 2.0V.
In this case, if we follow the specification, we can not use this CR type lithium button cell . Many users would like to use this CR type button cell for RTC. So, if we can chang the specification of Minimum VBAT voltage from 2.875V to less 2.0V, it is easy to use in many cases.
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