STM32WLE4JC datasheet(20/146 Pages) STMICROELECTRONICS

20 / 146 page

Functional overview

STM32WLE5/E4xx

20/146

DS13105 Rev 9

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.

Transmitter low output power

The transmit low output power up to + 15 dBm on full VDD range (1.8 to 3.6 V), is supported

through the RFO_LP RF pin. For this, the REG PA must be supplied from the regulated

VFBSMPS supply at 1.55 V, 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.

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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