Hardware layout UM1775
24/39 UM1775 Rev 4
6.13 OSC 32 KHz clock supply
If PC14 and PC15 are only used as GPIOs instead of as a clock, then SB18 and SB19 are
ON and R70 and R71 are removed.
HSE oscillator onboard from X2 crystal (not provided)
For typical frequencies and its capacitors and resistors, please refer to the
STM32L053C8T6
Datasheet. The configuration needed is:
– SB18, SB19 OFF
– X2, R70, R71, C47, C50 soldered
Oscillator from external PC14 (from external oscillator through pin 5 of the P3 connector)
the configuration needed is:
–SB18 ON
–SB19 OFF
– R70 removed
Note: Refer to application note AN2867 for STM32 microcontrollers oscillator design guide.
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