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UM1460
Hardware layout and configuration
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2.12 ST MEMS
The ST MEMS device LIS302DL is connected to the I2C1 bus of the STM32F417IGH6 on
the board.
2.13 Potentiometer
A 10 k
Ω
potentiometer RV1 is connected to PF9 of the STM32F417IGH6 on the board.
2.14 ADC
Two test points (TP3 AIN-) and (TP4 AIN+) are placed close to MCU port PC1 allowing
precise measurements on ADC1, ADC2 and ADC3 channel 11. As PC1 is also used as
current A input on the motor control connector it is recommended to remove R219 to
optimize noise immunity on this input.
A potentiometer RV1 is connected to PF9 of the STM32F417IGH6. If needed, a low-pass
filter (R74 and C59) can be placed on this input to reduce the bandwidth of the analog input
PF9.
It is also possible to place the Ethernet PHY (U5) in low-power mode in order to reduce the
noise induced by this high-frequency peripheral. Power down pin (MII_INT in the schematic)
is connected to PB14 of the MCU, so this I/O can be configured as output low during analog
precision measurement.
2.15 USB-OTG
FS
The STM3241G-EVAL evaluation board enables USB-OTG full speed communication via a
USB Micro-AB connector (CN8) and USB power switch (U1) connected to VBUS. The board
can be powered by this USB connection at 5 V DC with a 500 mA current limitation.
LED LD6 indicates that either:
•
Power switch (U1) is ON and STM3241G-EVAL is working as a USB host or
•
VBUS is powered by another USB host while STM3241G-EVAL is working as a USB
device.
LED LD5 indicates an over-current.
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