User manual

POWER SUPPLY CIRCUIT:
STM32-H103 can take power from two sources:
- USB connector where 5V power supply is applied by USB host
- Vin input in extension pin EXT2.26 where +5-9V may be applied
The board power consumption is: about 40 mA with all peripherials and MCU running at
full speed, there are different power saving modes which may put STM32F103RBT6 in
power sleep mode and in these modes the consumption of the MCU is only few micro
ampers.
RESET CIRCUIT:
STM32-H103 reset circuit is made with RC group R8 - 10K and C19 - 100nF.
Although on the schematic is made provision for external reset IC such is not necessary as
STM32 have build-in brown out detector. Manual reset is possible by the RESET button.
CLOCK CIRCUIT:
Quartz crystal 8Mhz is connected to STM32F103RBT6. Internal PLL circuit can multiply
this frequency up to 72Mhz.
32.768 KHz quartz crystal is connected to STM32F103RBT6 for it’s internal Real Time
Clock.
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