STM32WL55JC datasheet(20/145 Pages) STMICROELECTRONICS

20 / 145 page

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

HP PA

VLXSMPS

VFBSMPS (1.55V)

VDDPA

VR_PA (up to 3.1V)

RFO_HP

LDO/SMPS

REG

HP PA

VDD

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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