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Electrical characteristics STM32WLE5J8/JB/JC
92/135 DS13105 Rev 4
Figure 15. Low-speed external clock source AC timing diagram
5.3.10 Internal clock source characteristics
Parameters given in the table below are derived from tests performed under ambient
temperature and supply voltage conditions summarized in Table 25: General operating
conditions. The provided curves are characterization results, not tested in production.
High-speed internal (HSI16) RC oscillator
MS19215V2
V
LSEH
t
f(LSE)
90%
10%
T
LSE
t
t
r(LSE)
V
LSEL
t
w(LSEH)
t
w(LSEL)
Table 55. Low-speed external user clock characteristics
(1)
– Bypass mode
Symbol Parameter Conditions Min Typ Max Unit
f
LSE_ext
User external clock source
frequency
- 21.2 32.768 44.4 kHz
V
LSEH
OSC32_IN input pin high-
level voltage
-
0.7 x
V
DDx
-V
DDx
V
V
LSEL
OSC32_IN input pin low-
level voltage
-V
SS
- 0.3 x V
DDx
t
w(LSEH)
t
w(LSEL)
OSC32_IN high or low time - 250 - - ns
f
tolLSE
Frequency tolerance
Includes initial accuracy,
stability over temperature,
aging and frequency pulling
–500 - +500 ppm
1. Guaranteed by design.
Table 56. HSI16 oscillator characteristics
(1)
Symbol Parameter Conditions Min Typ Max Unit
f
HSI16
HSI16 frequency V
DD
= 3.0 V, T
A
= 30 °C 15.88 - 16.08 MHz