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VREF Output for external IC

Question asked by Tudi Le Bleis on May 7, 2018
Latest reply on May 15, 2018 by Tudi Le Bleis

I have a STM32L051 microcontroller and use the STM32L0Cube HAL.

I read fom the manual, that the STM32L0 have a possibility to provide a stable reference voltage for external ADC/DAC/... This is the VREF(BUF). If I understand correctly, using the CFGR3 register, I can enable the VREF, as well as check if it is ready. Additionally, I can choose to connect it to the PB0/1 output (SEL_VREF_OUT).

However in the examples provided, the VREF is only used internally for Comparator and ADCs, and not for external ICs.

Should I configure, say PB1, to be a standard DAC pin, and then using CFGR3 to connect it to the VREF?

Could someone give me some pointers on how to output the VREF on a PB1?