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STM32F101/103 VBAT Monitoring

Question asked by koepf.steffen on Sep 22, 2014
Latest reply on Sep 22, 2014 by baird.hal.001
I have a lithium battery connected to the VBAT pin and i would like
to monitor that voltage by software to give a warning when the time
to replace it is reached.
I have found no Lo-Bat bit, as known from external clock chips and
the vbat pin seems not internally connected to any adc input multiplexer.
The STM32F2.. series can monitor this through an adc channel.
Does anyone know what to do here?