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UM0579 Board assembly setup manual
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Appendix A Board assembly setup manual
Table 14. Board assembly setup manual
Resistor Value (
Ω
) Assembled Not assembled
General-purpose buttons
R13 0
PA8 MCU signal is connected to the
general-purpose button S4.
PA8 MCU pin is disconnected from
the button S4 and can be freely used
for other purposes.
R14 0
PB2 MCU signal is connected to the
general-purpose button S3.
PB2 MCU pin is disconnected from
the button S3 and can be freely used
for other purposes.
R15 0
PB5 MCU signal is connected to the
general-purpose button S2.
PB5 MCU pin is disconnected from
the button S2 and can be freely used
for other purposes.
Power supply
R28 0
Connects PA3 MCU pin to the low
battery out-put signal of the step-up
converter U5. The pin can be
configured as an external interrupt
line.
PA3 MCU pin is disconnected from
the LBO pin of U5 and can be freely
used for other purposes.
R30 0
Connects PA2 MCU pin to the
batteries. The battery voltage can be
measured if PA2 is configured as ADC
input line.
PA2 MCU pin is disconnected from
the batteries and can be freely used
for other purposes.
General-purpose LEDs
R12 470
PB13 MCU signal is connected to the
general-purpose LED LD2.
PB13 MCU pin is disconnected from
the LED LD2 and can be freely used
for other purposes.
R17 470
PB15 MCU signal is connected to the
general-purpose LED LD1.
PB15 MCU pin is disconnected from
the LED LD1 and can be freely used
for other purposes.
R20 470
PB10 MCU signal is connected to the
general-purpose LED LD4.
PB10 MCU pin is disconnected from
the LED LD4 and can be freely used
for other purposes.
R21 470
PB11 MCU signal is connected to the
general-purpose LED LD3.
PB11 MCU pin is disconnected from
the LED LD3 and can be freely used
for other purposes.
MEMS accelerometer
R7 0
Connects MEMS interrupt 1 pin of the
accelerometer to the PB12 MCU pin
which can be configured as an
external interrupt line. PB12 MCU pin is disconnected from
the MEMS interrupt 1 pin of the
accelerometer and can be freely
used for other purposes.