Leds; Pushbuttons; Linear Touch Sensor / Touchkeys - STMicroelectronics UM1079 User Manual

UM1079
By default, no battery holder is mounted on the board and SB21 and SB22 are configured in
their default state (see
Follow the procedure below to power the 32L152CDISCOVERYfrom the battery:
•
Solder a B7410AP2L battery holder from LOTES on CR1
•
Configure SB100 OFF
•
Remove both jumpers from CN3 (see
•
Select the battery as power supply. Two solutions are possible:
–
–
Note: In this configuration, it is possible to power the STM32L152RCT6 from the 3 V supply
voltage of the board by setting a jumper between VDD and 3V.
•
Plug the CR2032 battery into CR1 holder.
The demonstration is now ready to run.
Warning:
4.4

LEDs

•
LD1 COM: LD1 default status is red. LD1 turns to green to indicate that
communications are in progress between the computer and the ST-LINK/V2.
•
LD2 PWR: red LED indicates that the board is powered.
•
User LD3: user green LED connected to the I/O PB7 of the STM32L152RCT6.
•
User LD4: user blue LED connected to the I/O PB6 of the STM32L152RCT6.
4.5

Pushbuttons

•
B1 USER: User pushbutton connected to the I/O PA0 of the STM32L152RCT6.
•
B2 RESET: Pushbutton is used to RESET the STM32L152RCT6.
4.6

Linear touch sensor / touchkeys

To demonstrate touch sensing capabilities, the 32L152CDISCOVERY includes a linear
touch sensor which can be used either as a 3-position linear touch sensor or as 4
touchkeys. Both functionalities are illustrated in the demonstration software (see
Functions executed when clicking B1 button on page
Table 6: Solder bridges on page
Solder bridge: configure SB21 OFF, and SB22 ON. No header is required on JP2.
Jumper: configure SB21 and SB22 OFF. Solder a header on JP2, identical to JP1
on the top side. Set a jumper between VDD and VBAT to power the
STM32L152RCT6 of the board
Wrong solder bridge configuration can damage board
components.
DocID018789 Rev 4
21).
Figure 9: ST-Link connections on page
7).
Hardware and layout
16)
Table 3:
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