Board Layout; Power Supply Circuit; Reset Circuit; Clock Circuit - OLIMEX STM32-P107 User Manual

BOARD LAYOUT

POWER SUPPLY CIRCUIT

STM32-P107 can take power from three sources:
– PWR connector where (6.5-9)V DC or 6V AC is applied by external power source.
– +5V_ OTG-PWR from USB OTG
– +5V_JTAG from JTAG
The programmed board power consumption is about 70 mA.

RESET CIRCUIT

STM32-P107 reset circuit includes JTAG connector pin 15, U2 (STE101P) pin 28 (RESET), R73(10k),
R74(330Ohm), R75(100Ohm/1%), C55(100nF), STM32F107 pin 14 (NRST) and RESET button.

CLOCK CIRCUIT

Quartz crystal 25 MHz is connected to STM32F107 pin 12 (OSC_IN) and pin 13 (OSC_OUT).
Quartz crystal 32.768kHz is connected to STM32F107 pin 8 (PC14/OSC32_IN) and pin 9
(PC15/OSC32_OUT).