Transmitter; Figure 10. High Output Power Pa - STMicroelectronics STM32WL5 Series Reference Manual

RM0453
Signal name
SUBGHZSPI
5.3.3

Transmitter

The transmit chain comprises the modulated output from the modem, that directly
modulates the RF-PLL. An optional pre-filtering of the bit stream can be enabled to reduce
the power in the adjacent channel also dependent on the selected modulation scheme. The
modulated signal from the RF-PLL directly drives the high-power PA (HP PA) or low-power
PA (LP PA).
Transmitter high output power
Transmit high output power up to + 22 dBm, is supported through the RFO_HP RF pin. The
HP PA can be supplied from the PA regulator (REG PA) up to 3.1 V.
For this, the REG PA must be supplied directly from V
Figure 10.
LDO/SMPS
Note: Use of the SMPS is optional. When SMPS is not used, the BOM can be reduced by removing the coil
between VLXSMPS and VFBSMPS pins.
Table 26. Sub-GHz internal input/output signals (continued)
HSERDY
BUSY
Interrupts

Figure 10. High output power PA

LDO mode
V
DD
VDDSMPS (1.8 to 3.6V)
VLXSMPS
VFBSMPS (1.55V)
VDDPA
VR_PA (up to 3.1V)
REG
PA
RFO_HP
HP PA
Signal type
Digital output HSE32 clock ready indication
Digital in/output Sub-GHz radio SPI interface
Digital output BUSY signal
Digital output IRQ interrupts
DD
V
DD
LDO/SMPS
V
DD
RM0453 Rev 5
Sub-GHz radio (SUBGHZ)
Description
(on VDDSMPS pin), as shown in
SMPS mode
VDDSMPS (1.8 to 3.6V)
VLXSMPS
VFBSMPS (1.55V)
VDDPA
VR_PA (up to 3.1V)
REG
PA
RFO_HP
HP PA
V
DD
MSv62616V2
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