UM1817 Datasheet, PDF (20/58 Pages) STMicroelectronics – Evaluation board with STM32F091VC MCU

Hardware layout and configuration
UM1817
Note:
Table 12. Touch sensing buttons related solder bridges
Solder Bridge
Description
PD13 is connected to touch slider when SB7 is open.
(Default setting)
SB7
PD13 is connected to extension connector CN7 when SB7 is closed. In such case
R24 must be removed to avoid disturbance due to the touch button.
PD12 is connected to touch slider when SB8 is open.
(Default setting)
SB8
PD12 is connected to extension connector CN7 when SB8 is closed. In such case
R25 must be removed to avoid disturbance due to the touch button.
PD14 is connected to sampling capacitor when SB6 is open.
(Default setting)
SB6
PD14 is connected to extension connector CN7 when SB6 is closed. In such case
C4 must be removed to avoid disturbance due to the capacitor.
SB9
SB10
PB12 is connected to shield when SB9 is open.
(Default setting)
PB12 is connected to extension connector CN6 when SB9 is closed. In such case
R30 must be removed to avoid disturbance due to the shield.
PB11 is connected to shield charge capacitor when SB10 is open.
(Default setting)
PB11 is connected to extension connector CN6 when SB10 is closed. In such case
R37 must be removed to avoid disturbance due to the capacitor.
Touch sensing buttons are fully functional only when the STM32091C-EVAL board is
powered on in power mode 1 (both VDD and VDDA are connected to fixed 3.3 V). It is
potentially necessary to adjust the capacitor value of C8 and the firmware to adapt them to
the voltage range from 1.65 V to 3.6 V of VDD on power-mode 2 and 3.
2.10
microSD card
The 2-Gbyte (or more) microSD card connected to SPI1 port (Shared with color LCD) of the
STM32F091VCT6 is available on the board. microSD card detection is managed by
standard IO port PE11 and it should be set with internal pull-up.
2.11
Analog input
The two-pin header CN18 and the 10K ohm potentiometer RV3 are connected to PC0 of
STM32F091VCT6 as analog input. A low-pass filter is implemented by replacing R191 and
C101 with the right value of resistor and capacitor as requested by end user’s application.
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