STM32F103XC datasheet(37/143 Pages) STMICROELECTRONICS

37 / 143 page

DS5792 Rev 13

37/143

STM32F103xC, STM32F103xD, STM32F103xE

Pinouts and pin descriptions

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5. PC13, PC14 and PC15 are supplied through the power switch. Since the switch only sinks a limited amount of current (3

mA), the use of GPIOs PC13 to PC15 in output mode is limited: the speed should not exceed 2 MHz with a maximum load of

30 pF and these IOs must not be used as a current source (e.g. to drive an LED).

6. Main function after the first backup domain power-up. Later on, it depends on the contents of the Backup registers even after

reset (because these registers are not reset by the main reset). For details on how to manage these IOs, refer to the Battery

backup domain and BKP register description sections in the STM32F10xxx reference manual, available from the

STMicroelectronics website: www.st.com.

7. In the WCLSP64 package, the PC3 I/O pin is not bonded and it must be configured by software to output mode (Push-pull)

and writing 0 to the data register in order to avoid an extra consumption during low-power modes.

8. Unlike in the LQFP64 package, there is no PC3 in the WLCSP package. The VREF+ functionality is provided instead.

9. This alternate function can be remapped by software to some other port pins (if available on the used package). For more

details, refer to the Alternate function I/O and debug configuration section in the STM32F10xxx reference manual, available

from the STMicroelectronics website: www.st.com.

10. For the WCLSP64/LQFP64 package, the pins number 5 and 6 are configured as OSC_IN/OSC_OUT after reset, however

the functionality of PD0 and PD1 can be remapped by software on these pins. For the LQFP100/BGA100 and

LQFP144/BGA144 packages, PD0 and PD1 are available by default, so there is no need for remapping. For more details,

refer to Alternate function I/O and debug configuration section in the STM32F10xxx reference manual.

11. For devices delivered in LQFP64 packages, the FSMC function is not available.

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