Hardware and layout UM1018
12/44 Doc ID 18141 Rev 1
2.10 Touch sensing buttons
The STM32L152-EVAL evaluation board supports two touch sensing buttons based on
either charge transfer technology (default) or RC charging.
RC charging technology can be enabled by modifying the board:
1. Remove R29.
2. Mount resistors R22 (1 MOhm), R23 (1 MOhm), R24 (10 KOhm) and C18(1 nF).
2.11 MicroSD Card
The 2 GB (or more) MicroSD Card connected to SPI2 port of the STM32L152VBT6 is
available on the board. MicroSD Card detection is managed by standard I/O port PE6.
Note: JP2 must be kept on open for trace purposes (connected to CN8).
2.12 Analog input
A BNC connector, CN13, is connected to PA5 of the STM32L152VBT6 as external analog
input or DAC output. The 50 ohm terminal resistor can be enabled by closing the solder
bridge SB5. A low pass filter can be implemented for the BNC connector by replacing R47
and C31 for ADC input or replacing R45 and C31 for DAC output with the values requested
by end user's application.
There are also 3 analog signals available on the board:
1. 10 KOhm potentiometer RV3 connected to PB12.
2. IDD measurement output signal connected to PA5 for MCU power consumption test.
3. External ADC input which can be connected to TP3 (AIN+) and TP2 (AIN-), R48 should
be removed to reduce the noise on this analog input.
JP9
USART2_CTS is connected to RS-232 transceiver when JP9 is set as shown
(default setting).
Bootloader_RESET is connected to RS-232 transceiver when JP9 is set as
shown.
JP7,JP8 Refer to Ta bl e 6 for
USART3 settings.
JP6 See Tabl e 5 for Bootloader_BOOT0 settings.
Table 8. RS-232 and IrDA related jumpers (continued)
Jumper Description Setting
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