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STM32WL33C8V Datasheet(PDF) 63 Page - STMicroelectronics

Part # STM32WL33C8V
Description  Multiprotocol LPWAN 32-bit MCU Arm® Cortex®-M0 2(G)FSK, 4(G)FSK, ASK, D-BPSK, up to 256KB flash, 32KB SRAM
PDF  91 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32WL33C8V Datasheet(HTML) 63 Page - STMicroelectronics

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Figure 13. Typical application with a 32.768 kHz crystal
OSC32_IN
OSC32_OUT
Drive
programmable
amplifier
fLSE
32.768 kHz
resonator
Resonator with integrated
capacitors
CL1
CL2
Note:
No external resistors are required between OSC32_IN and OSC32_OUT, and it is forbidden to add one.
In bypass mode, the LSE oscillator is switched off and the input pin is a standard GPIO. The external clocksignal
has to respect the I/O characteristics detailed in Section 6.3.15: I/O port characteristics. The recommend clock
input waveform is shown in the figure below.
Figure 14. Low-speed external clocksource AC timing diagram
VLSEH
tf(LSE)
90%
10%
TLSE
t
tr(LSE)
VLSEL
tw(LSEH)
tw(LSEL)
Table 51. Low-speed external user clockcharacteristics(1) – Bypass mode
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fLSE_ext
User external clock source
frequency
-
21.2
32.768
44.4
kHz
VLSEH
OSC32_IN input pin high- level
voltage
-
0.7 x VDDx
-
VDDx
V
VLSEL
OSC32_IN input pin low- level
voltage
-
VSS
-
0.3 x VDDx
tw(LSEH) tw(LSEL) OSC32_IN high or low time
-
250
-
-
ns
ftolLSE
Frequency tolerance
Includes initialaccuracy,
stability over temperature,
aging and frequency pulling
–500
-
+500
ppm
1. Guaranteed by design - not tested in production.
STM32WL33xx
Electrical characteristics
DS14221 - Rev 5
page 63/91



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