UM1521
Hardware layout and configuration
Doc ID 022868 Rev 1
19/56
2.10
Touch sensing slider
The STM32L152D-EVAL evaluation board supports a touch sensing slider based on either
RC charging or charge transfer technology. The charge transfer technology is enabled by
default assembly.
PB6 and PB7 manage an active shield reducing sensitivity to other signals. The active
shield is placed on an internal layer immediately under the slider (layer 2) to cover
components related to the slider and the slider itself.
Note:
The slider is optimized when the board is powered at 3.3 V. It may be necessary to adjust
the capacitor value of C54 (47nF COG) and the firmware to adapt them to a low voltage.
2.11 MicroSD
Card
The 2 GB (or more) MicroSD Card connected to the SDIO port of the STM32L152ZDT6 is
available on the board. MicroSD Card detection is managed by standard I/O port PC7.
The MicroSD Card will work properly when VDD > 2.7 V.
The LCD glass module has to be mounted on IO position for MicroSD Card usage. Refer to
for detail.
Table 15.
Touch sensing slider related solder bridges
Solder bridge
Description
SB3
PF9 is connected to sampling capacitor when SB3 is open. (
Default setting
)
PF9 is connected to extension connector CN10 when SB3 is closed. In this case
C54 must be removed to avoid disturbance due to the capacitor
SB4
PF8 is connected to touch slider when SB4 is open. (
Default setting
)
PF8 is connected to extension connector CN10 when SB4 is closed. In this case
R69 must be removed to avoid disturbance due to the touch slider
SB5
PF7 is connected to touch slider when SB5 is open. (
Default setting
)
PF7 is connected to extension connector CN10 when SB5 is closed. In this case
R73 must be removed to avoid disturbance due to the touch slider
SB6
PF6 is connected to touch slider when SB6 is open. (
Default setting
)
PF6 is connected to extension connector CN10 when SB6 is closed. In this case
R77 must be removed to avoid disturbance due to the touch slider
SB10
PB6 is connected to touch slider when SB10 is open. (
Default setting
)
PB6 is connected to extension connector CN10 when SB10 is closed. In this case
R92 must be removed to avoid disturbance due to the shield
SB11
PB7 is connected to touch slider when SB11 is open. (
Default setting
)
PB7 is connected to extension connector CN10 when SB11 is closed. In this case
R101 must be removed to avoid disturbance due to the capacitor
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