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Use TCXO for RTC clock source on STM32?

Question asked by krueger.jeff on Nov 6, 2015
Latest reply on Nov 26, 2015 by Amel N
Has anyone used a TCXO (temperature compensated crystal oscillator powered device with driven clock output) as a clock source for the RTC on STM32F030R8T6 or STM32L152R8T6 (or any STM32) including operation in Standby mode?  Datasheet for the STM32F030R8T6 (DocID024849, rev2) p21/55 and Reference Manual (RM0360 Rev3) p118/119/136 indicate it can be done. Similarly datasheet for the STM32L152R8T6 (DocID022799 rev11) p73 and Reference Manual (RM0038 rev13) p133/135/166 indicate it can be done.  This is an attractive alternative to using 'RTC digital calibration' for application requiring a very small RTC drift over a wide temp range.

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