Data Sheet

3.3 Clocks
As the crystals are already integrated into the package, it is not possible to use any clock in bypass mode. The
module integrates 32.774 kHz crystal for LSE and 32 MHz crystal for the HSE clock.
• LSE must be used in medium high driving capability. (RCC_BDCR_LSEDRV[1:0] = 10, refer to
Multiprotocol wireless 32-bit MCU Arm
®
-based Cortex
®
-M4 with FPU, Bluetooth
®
Low Energy and
802.15.4 radio solution (RM0434) for more details).
• HSE is already tuned.
RCC_HSECR_HSETUNE[5:0] value is loaded automatically by HW. The RCC_HSECR register
configuration must not be changed by the user to keep the default parameters.
• LSCO and MCO outputs are available.
• HSEGMC[2:0] must be set to 0b011.
3.4 Antenna
The rectangular module has one shorter side clearly different from the remaining finish surface. This side is
unshielded and the mold cover contains the integrated antenna.
There is no option to use an external antenna.
3.5 One time programming (OTP)
The STM32WB5MMG features 1 Kbyte one time programmable (OTP) memory for use by the end product. This
is described in Multiprotocol wireless 32-bit MCU Arm
®
-based Cortex
®
-M4 with FPU, Bluetooth
®
Low Energy
and 802.15.4 radio solution (DS11929) and Multiprotocol wireless 32-bit MCU Arm
®
-based Cortex
®
-M4 with FPU,
Bluetooth
®
Low Energy and 802.15.4 radio solution (RM0434).
Note: STM32WB5MMG uses the first and last words of this area for trimming and identification purposes.
As a consequence addresses 0x1FFF7000 - 0x1FFF7007 and 0x1FFF73F8 - 0x1FFF73FF cannot be changed.
STM32WB5MMG
Clocks
DS13252 - Rev 3
page 5/41