Electrical characteristics
Figure 15. Unused I/O pin connection
VDD
1 0 kΩ
STM32F103xx
UNU SED I/O PORT
STM32F103xx
1 0 kΩ
STM32F103xx
UNU SED I/O PORT
ai14147b
Output driving current
The GPIOs (general purpose input/outputs) can sink or source up to +/-8 mA, and sink
+20 mA (with a relaxed VOL).
In the user application, the number of I/O pins which can drive current must be limited to
respect the absolute maximum rating specified in Section 5.2:
● The sum of the currents sourced by all the I/Os on VDD, plus the maximum Run
consumption of the MCU sourced on VDD, cannot exceed the absolute maximum rating
IVDD (see Table 5).
● The sum of the currents sunk by all the I/Os on VSS plus the maximum Run
consumption of the MCU sunk on VSS cannot exceed the absolute maximum rating
IVSS (see Table 5).
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