STM32WLE4JC datasheet(23/146 Pages) STMICROELECTRONICS

23 / 146 page

DS13105 Rev 9

23/146

STM32WLE5/E4xx

Functional overview

3.9

Power supply management

The devices embed two different regulators: one LDO and one DC/DC (SMPS). The SMPS

can be optionally switched-on by software to improve the power efficiency. As LDO and

SMPS operate in parallel, the SMPS switch-on is transparent to the user and only the power

efficiency is affected.

3.9.1

Power supply schemes

The devices require a VDD operating voltage supply between 1.8 V and 3.6 V. Several

independent supplies (VDDSMPS, VFBSMPS, VDDA, VDDRF) can be provided for specific

peripherals:

•

VDD = 1.8 V to 3.6 V

VDD is the external power supply for the I/Os, the system analog blocks such as reset,

power management, internal clocks and low-power regulator. It is provided externally

through VDD pins.

•

VDDSMPS = 1.8 V to 3.6 V

VDDSMPS is the external power supply for the SMPS step-down converter. It is provided

externally through VDDSMPS supply pin and must be connected to the same supply as

VDD.

•

VFBSMPS = 1.45 V to 1.62 V (1.55 V typical)

VFBSMPS is the external power supply for the main system regulator. It is provided

externally through VFBSMPS pin and is supplied through the SMPS step-down

converter.

•

VDDA = 0 V to 3.6 V (DAC minimum voltage is 1.71 V without buffer and 1.8 V with

buffer. COMP and ADC minimum voltage is 1.62 V. VREFBUF minimum voltage is

2.4 V)

VDDA is the external analog power supply for A/D converters, D/A converters, voltage

reference buffer, and comparators. The VDDA voltage level is independent from the VDD

voltage (see power-up and power-down limitations below) and must preferably be

connected to VDD when these peripherals are not used.

•

VDDRF = 1.8 V to 3.6 V

VDDRF is an external power supply for the radio. It is provided externally through the

VDDRF pin and must be connected to the same supply as VDD.

•

VDDRF1V5 = 1.45 V to 1.62 V

VDDRF1V5 is an external power supply for the radio. It is provided externally through the

VDDRF1V5 pin and must be connected externally to VFBSMPS.

•

VBAT = 1.55 V to 3.6 V

VBAT is the power supply for RTC, TAMP, external clock 32 kHz oscillator and backup

registers (through power switch) when VDD is not present.

LORA_BW_15

15.63

250

LORA_BW_10

10.42

167

LORA_BW_7

7.81

250

Table 6. LoRa mode intermediate frequencies (continued)

Setting name

Bandwidth (kHz)

fif (kHz)

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