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TLC339: Question regarding the reason for adding a DC source at the output of this comparator in this reference design.

A BC
Prodigy 90 points
Part Number: TLC339

Hello, I am looking at the circuit on page 50 of this presentation (Microsoft PowerPoint - Sec2_RemoteSysMonitor_Print.ppt (ti.com)). I am unable to understand the reason for use of this battery and the 2k resistor here. Would really appreciate if you could help me out.