ST STM32WBA65I-DK1 User Manual page 23

7.4 Clock sources
7.4.1 HSE clock reference
A 32 MHz crystal oscillator is used as the high‑speed clock (HSE) of the MCU. The HSE oscillator is trimmed
during board manufacturing.
7.4.2 LSE clock reference
A 32.768 kHz crystal oscillator is used as the low‑speed clock (LSE) of the MCU.
7.5 Reset sources
The reset signal of the STM32WBA65I-DK1 Discovery kit is active at a low level and the reset sources can come
from:
• The reset push button (B3),
• The CN9 pin3 of the ARDUINO
• The embedded STLINK-V3EC debugger,
• Or the MIPI10 and TAG interfaces.
7.6 Virtual COM port
The serial interface USART1 is directly available as a Virtual COM port of the PC, connected to the STLINK-V3EC
USB connector (CN6).
7.7 Audio codec
There is a low‑power stereo audio codec (U22) with a headphone amplifier, provided with STM32WBA65I-DK1.
Input and output stereo jacks are also provided.
The MCU is connected to the audio codec using an I
for the data path.
7.8 Onboard MEMS audio sensor omnidirectional digital microphone
A miniature high‑performance low‑power silicon digital microphone with a single‑bit PDM output is available on
this Discovery board and connected to the SAI and codec interfaces by default.
7.9 Display
On the STM32WBA65I-DK1 Discovery board, an OLED display with a panel matrix of 128×64 and 2000/1
contrast is provided on SPI3.
7.10 Buttons and LEDs
Joystick
A joystick is provided on the Discovery board with the position detected by the STM32 ADC PA3 pin.
Table 6 lists the positions with the associated ADC level to be detected:
UM3462 - Rev 1
®
connector,
Table 6.
Position
Select
Left
Down
Up
Right
2
C interface for the control path (I2C1) and the SAI1 interface
Document revision history
Ratio
0.00
0.20
0.40
0.61
0.80
UM3462
Hardware layout and configuration
ADC4 channel 8
0.00 V
0.67 V
1.32 V
2.01 V
2.65 V
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