STM32WLE4JC datasheet(70/145 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32WLE5/E4xx

70/145

DS13105 Rev 8

Table 29. Sub-GHz radio general specifications

Symbol

Description

Conditions

Min

Typ

Max

Unit

Frequency synthesizer range

Low-power PA

150

960

MHz

FSTEP Frequency synthesizer step

High-resolution mode HSE / 2(2)(5)

-095

PHN(1)

(2)

Synthesizer phase noise

(868 to 915 MHz)

100 kHz offset

–100

dBc/Hz

1 MHz offset

–120

10 MHz offset

–135

TS_FS Synthesizer wakeup time

From Standby, HSE32 mode

µs

TS_HO

Synthesizer hop time

10 MHz step

TS_OS

Crystal oscillator wakeup time

From Standby, RC(3) normal mode

from HSE32 off

-170

OSC_

TRM

Crystal oscillator trimming range

for crystal frequency error

compensation(4)

Min/max XTAL specifications

±15

±30

ppm

BR_F

Bitrate, FSK

Programmable

(min modulation index is 0.5)

0.6

300(5)

Kbit/s

FDA

Frequency deviation, FSK

Programmable

(FDA + BR_F/2 ≤ 250 kHz)

0.6

200

kHz

BR_L

Bitrate, LoRa

Min for SF12, BW_L = 7.8 kHz

Max for SF7, BW_L = 500 kHz

0.018

62.5(6)

Kbit/s

BW_L

Signal BW, LoRa

Programmable

7.8

500(6)

kHz

Spreading factor for LoRa

Programmable, chips/symbol = 2SF

1. Phase Noise specifications are given for the recommended PLL bandwidth to be used for the specific modulation/BR,

optimized settings may be used for specific applications.

2. Phase Noise is not constant over frequency, due to the topology of the PLL. For two frequencies close to each other, the

phase noise may change significantly

3. Wakeup time till crystal oscillator frequency is within ±10 ppm.

4. OSC_TRIM is the available trimming range to compensate for crystal initial frequency error and to allow crystal temperature

compensation implementation. The total available trimming range is higher and allows the compensation for all device

process variations

5. Maximum bit rate is assumed to scale with the RF frequency: for example 300 Kbit /s in the 869-to-915 MHz frequency

band and only 50 Kbit/s at 150 MHz.

6. For RF frequencies below 400 MHz, there is a scaling between the frequency and supported bandwidth. Some bandwidths

may not be available below 400 MHz.

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