Figure 15. Rf Block Diagram; Figure 16. Fcc Identifier On The Stm32Wl5Moc Module - ST STM32WL Series User Manual

The RF block diagram around the STM32WL5MOC module is displayed in
PB0-VDD_TCXO
TCXO
OSC_IN
32MHz HSE
OSC_OUT
The screwed and glue-fixed antenna to connect to the SMA connector and provided in the carton box is the ANT-
SS900 from the LPRS company.
This antenna is used for the different FCC/ISED/CE certifications. It is then mandatory to use this referenced
antenna (and only this one) for radiation tests on the CEB MB1779 boards.
The antenna is stuck to the SMA connector because of FCC constraints. Indeed, it is mentioned in the FCC
regulations that as soon as a product is considered general public, the FCC implies that the antenna must be
stuck to the board connector with epoxy glue. Refer to the FCC documentation BASIC EQUIPMENT
AUTHORIZATION GUIDANCE FOR ANTENNAS USED WITH PART 15 INTENTIONAL RADIATORS in the
chapter ANTENNA REQUIREMENTS—Section 15.203. The purpose of section 15.203 is to prevent attaching
any other antennas [other than approved with the device] to a part 15 transmitter.
Note that the STM32WL5MOC module and the FCC identifier preceded by the term FCC ID are engraved on the
top of the module (YCP-32WL5MOCH01 (first revision of the STM32WL5MOC module including the
STM32WL5MOCH6 module)).
UM3127 - Rev 1
Figure 15.
VDD_RF
VDDRF VDDSMPS
VLXSMPS
Power
management
VFBSMPS
VDDRF1V55
STM32WL transceiver
(STM32WL55JC MCU in
BGA92 package)
VDDPA
Reg PA
VR_PA
DC
switch
PA HP
RFO_HP
RFO_LP
PA LP
RFI_P
Rx
RFI_N
Figure 16. FCC identifier on the STM32WL5MOC module
Hardware layout and configuration
Figure
RF block diagram
SMPS part
DC
switch
SW_RF
Front-end part
IPD
(Integrate
Passive
Device)
SP3T
UM3127
15.
PC3
RF
antenna
matching
PC5
SW_RF
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