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STM32WL55JC bảng dữ liệu(PDF) 20 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  Multiprotocol LPWAN dual core 32-bit Arm® Cortex®-M4/M0 LoRa®, (G)FSK, (G)MSK, BPSK, up to 256KB Flash, 64KB SRAM
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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STM32WL55JC bảng dữ liệu(HTML) 20 Page - STMicroelectronics

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Functional overview
STM32WL55/54xx
20/145
DS13293 Rev 1
3.9.3
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 output power PA (HP PA) or low
output power PA (LP PA).
Transmitter high output power
Transmit high output power up to + 22 dBm, is supported through the RFO_HP RF pin.
For this, the REG PA must be supplied directly from VDD on VDDSMPS pin, as shown in the
figure below.
The output power range is programmable in 32 steps of ~ 1 dB. The power amplifier
ramping timing is also programmable.This allows adaptation to meet radio regulation
requirements.
Figure 3. High output power PA
The table below gives the maximum transmit output power versus the VDDPA supply level.
Table 4. Sub-GHz radio transmit high output power
VDDPA supply (V)
Transmit output power (dBm)
3.3
+ 22
2.7
+ 20
2.4
+ 19
1.8
+ 16
MSv62616V2
VLXSMPS
VFBSMPS (1.55V)
VDDPA
VR_PA (up to 3.1V)
RFO_HP
LDO/SMPS
REG
PA
HP PA
VLXSMPS
VFBSMPS (1.55V)
VDDPA
VR_PA (up to 3.1V)
RFO_HP
LDO/SMPS
REG
PA
HP PA
VDD
VDD
VDD
VDD
VDDSMPS (1.8 to 3.6V)
VDDSMPS (1.8 to 3.6V)
LDO mode
SMPS mode
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.



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