UM1018 datasheet(12/42 Pages) STMICROELECTRONICS

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Hardware and layout

UM01018

12/42

Doc ID 18141 Rev 2

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:

Remove R29.

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:

10 KOhm potentiometer RV3 connected to PB12.

IDD measurement output signal connected to PA5 for MCU power consumption test.

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 Table 6 for

USART3 settings.

JP6

See Table 5 for Bootloader_BOOT0 settings.

Table 8.

RS-232 and IrDA related jumpers (continued)

Jumper

Description

Setting

Table 9.

MicroSD Card related jumpers

Jumper

Description

JP2

PE6 is connected to MicroSD Card detection when JP2 is closed (default setting).

PE6 is disconnected from MicroSD Card detection but remains connected to trace

connector CN8 when JP2 is open.

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