Operating Voltage; Eeprom; Ext_I2C Connector; Octo-Spi Flash Memory Device - ST STM32L4R9I-EVAL User Manual

UM2248
a case, the disconnected addressing inputs of the NOR Flash memory device are pulled down
by resistors.
6.21.2

Operating voltage

NOR Flash memory operating voltage must be in the range from 1.65 V to 3.6 V.
6.22

EEPROM

M24128-DFDW6TP, a 128-Kbit I²C-bus EEPROM device, is fitted on the main board of
STM32L4R9I-EVAL, in U3 position. It is accessed with I²C-bus lines I2C2_SCL and
I2C2_SDA of STM32L4R9AII6. It supports all I²C-bus modes with speeds up to 1 MHz. The
base I²C-bus address is 0xA0. Write-protecting the EEPROM is possible through opening
the SB13 solder bridge. By default, SB13 is closed and writing into the EEPROM enabled.
6.22.1 Operating voltage
The M24128-DFDW6TP EEPROM device's operating voltage must be in the range from
1.7 V to 3.6 V.
6.23

EXT_I2C connector

The connection of CN2 EXT_I2C to the I²C bus daughterboard is possible. MFX_GPIO8 of
MFX MCU provides the EXT_RSET signal, and the SB12 solder bridge is used to connect
the +5 V power supply of the daughterboard.
6.24

Octo-SPI Flash memory device

MX25LM51245GXDI00, a 512-Mbit Octo-SPI Flash memory device, is fitted on the
STM32L4R9I-EVAL main board, in U6 position. It allows evaluating STM32L4R9AII6
Octo-SPI interface.
MX25LM51245GXDI00 operates in a single transfer rate (STR) mode or a double transfer
rate (DTR) mode.
Table 16
Octo-SPI Flash memory device.
.
Element
R221
R215
Section 6.4 provides information on the associated configuration elements.
shows the configuration elements and their settings allowing them to access the

Table 16. Configuration elements related to Octo-SPI Flash device

Setting
R221 in Default setting.
R215 out OctoSPI1_CLK is available to the Octo-SPI Flash memory device.
OctoSPI1_CLK is not available to the Octo-SPI Flash memory
R221 out
device. PA3 port of STM32L4R9AII6 is routed to the OpAmp1_Vout
R215 in
signal.
Configuration
UM2248 Rev 4
Hardware layout and configuration
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