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STM32 Nucleo
Application note
ST STM32 Application Note page 5
Microcontroller gpio hardware settings and low-power consumption
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AN4899
List of figures
Figure 1.
Three-volt compliant GPIO structure (TC)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 2.
Three-volt or five-volt tolerant GPIO structure (TT or FT)
. . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 3.
Output buffer and current flow
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 4.
Logical level compatibility
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 5.
STM32 current flow according to output voltage level
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 6.
Example of white LED drive connections
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 7.
Example of triac drive connections
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 8.
Example of I
Figure 9.
Example of 5 V to 3.3 V power supply
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 10.
Example of UART connections
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 11.
Example of USB VBUS connections
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 12.
Example of VBUS to VDD power supply
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 13.
Example of five-volt ADC conversion
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 14.
Workaround example for five-volt ADC conversion
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 15.
Multi voltage leakage example
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 16.
Voltage protection when VDD is not supplied
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 17.
Open-drain output with no load
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 18.
GPIO configuration flowchart (1 of 2)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 19.
GPIO configuration flowchart (2 of 2)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2
C connections
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
AN4899 Rev 3
List of figures
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