Buttons And Leds; I 2 C Addresses Of Modules Used On Mb1508; Table 4. Button And Led Control Port; Table 5. I 2 C Addresses For Each Module - STMicroelectronics B-L462E-CELL1 User Manual

7.12

Buttons and LEDs

The B1 black button located on the top left side is the reset of the STM32L462REY6TR microcontroller. Refer to
Figure 3.
The B2 blue button located on the top left side is used as a digital input or as an alternate wake-up function.
When the button is depressed the logic state is LOW, otherwise, the logic state is HIGH.
Three LEDs (LD1, LD2, and LD3), located on the top left side are available for the user. To light a LED a logic
state HIGH must be written in the corresponding GPIO. As the GPIOs can be connected to timers in the chip, the
user may use the PWM function to control the brightness of LEDs.
Reference
B1
B2
LD1
LD2
LD3
LD4
LD5
reference
LD7
7.13 2
I C addresses of modules used on MB1508
Table 5 displays the I
Modules
HTS221
LPS22HH
LSM303AGR
M24128-
DFMN6TP
UM2743 - Rev 1
Table 4. Button and LED control port
Color
Black
Blue
Green
Red
Blue
Green
Green
Bicolor (red and green)
Red
2
C read and write addresses for the modules that are connected to the I2C1 bus.
2
Table 5. I
Description
Capacitive digital sensor for relative
humidity and temperature
MEMS nano pressure sensor
3D accelerometer and 3D
magnetometer
2
128-Kbit serial I C bus EEPROM
Name
Reset
Wake-up
User LED1
User LED2
User LED3
PSM_IND, controlled by the modem, lights
ON when the modem is not in low‑power
LED4
LED5
ST-LINK COM
Fault Power
C addresses for each module
SAD[6:0] + R/W
1011111X
1011101x
(SDA[0]=1])
0011001x
(Linear
acceleration)
0011110x
(Magnetic field)
1010000x
(Memory array)
1011000x
(Identification
page)
UM2743
Buttons and LEDs
Comment
-
Alternate function Wake-up
PC6
PB15
PB14
mode, and OFF when the modem is in
low‑power mode.
TX_IND, controlled by the modem
Green during communication
Current upper than 750 mA
I2C write address I2C read address
0xBE 0xBF
0xBA 0xBB
0x32 0x33
(Linear (Linear
acceleration) acceleration)
0x3C 0x3D
(Magnetic field) (Magnetic field)
0xA0 0xA1
(Memory array) (Memory array)
0xB0 0xB1
(Identification (Identification
page) page)
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