UM1817 datasheet(20/58 Pages) STMICROELECTRONICS

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Hardware layout and configuration

UM1817

20/58

DocID026902 Rev 3

Note:

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.

Table 12. Touch sensing buttons related solder bridges

Solder Bridge

Description

SB7

PD13 is connected to touch slider when SB7 is open.

(Default setting)

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.

SB8

PD12 is connected to touch slider when SB8 is open.

(Default setting)

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.

SB6

PD14 is connected to sampling capacitor when SB6 is open.

(Default setting)

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

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.

SB10

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.

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