Limitations; Operating Voltage; Octo-Spi Dram Device; Touch-Sensing Button - ST STM32L4R9I-EVAL User Manual

Hardware layout and configuration
Table 14. Configuration elements related with Octo-SPI Flash device (continued)
Element
R67
SB54
R75
SB55
9.24.1

Limitations

Octo-SPI Flash memory device operation is exclusive with OpAmp1 and with motor control.
9.24.2

Operating voltage

Voltage of Octo-SPI Flash memory device MX25LM51245GXDI00 is in the range of
2.7 V to 3.6 V.
9.25

Octo-SPI DRAM device

IS66WVH8M8BLL-100BLI, a 64-Mbit self-refresh dynamic RAM (DRAM) device with a
HyperBus interface, is fitted on the STM32L4R9I-EVAL main board, in U5 position. It allows
evaluating STM32L4R9AII6 Octo-SPI interface.
9.25.1 Operating voltage
Voltage of Octo-SPI DRAM device IS66WVH8M8BLL-100BLI is in the range of 2.7 V to
3.6 V.
9.26

Touch-sensing button

The STM32L4R9I-EVAL board supports a touch sensing button based on either RC
charging or on charge-transfer technique. The latter is enabled, by default.
The touch sensing button is connected to PC6 port of STM32L4R9AII6 and the related
charge capacitor is connected to PC7.
An active shield is designed in the layer 2 of the main PCB, under the button footprint. It
allows reducing disturbances from other circuits to prevent from false touch detections.
The active shield is connected to PB6 port of STM32L4R9AII6 through the resistor R22. The
related charge capacitor is connected to PB7.
Table 15
them serve to enable or disable its operation. However, most of them serve to optimize the
40/87
Setting
Default setting.
R67 in
OctoSPI1_IO6 data line is available at Octo-SPI Flash memory
SB54 open
device.
R67 out
OctoSPI1_IO6 is not available at Octo-SPI Flash memory device.
PC3 port of SSTM32L4R9AII6 is routed to motor control signal.
SB54 closed
Default setting.
R75 in
OctoSPI1_IO7 data line is available at Octo-SPI Flash memory
SB55 open
device.
R75 out
OctoSPI1_IO7 is not available at Octo-SPI Flash memory device.
PC4 port of STM32L4R9AII6 is routed to motor control signal.
SB55 closed
shows the configuration elements related with the touch sensing function. Some of
DocID030791 Rev 2
Configuration
UM2248