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STMicroelectronics Discovery kit for STM32L151/152 line - with STM32L152RC MCU STM32L152C-DISCO STM32L152C-DISCO Hoja De Datos

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STM32L152C-DISCO
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DocID022799 Rev 6
STM32L15xCC STM32L15xRC STM32L15xUC STM32L15xVC
Electrical characteristics
111
Low-speed external user clock generated from an external source
The characteristics given in the following table result from tests performed using a low-
speed external clock source, and under ambient temperature and supply voltage conditions 
summarized in 
.
          
Figure 16. Low-speed external clock source AC timing diagram
High-speed external clock generated from a crystal/ceramic resonator
The high-speed external (HSE) clock can be supplied with a 1 to 24 MHz crystal/ceramic 
resonator oscillator. All the information given in this paragraph are based on 
characterization results obtained with typical external components specified in 
. In 
the application, the resonator and the load capacitors have to be placed as close as 
possible to the oscillator pins in order to minimize output distortion and startup stabilization 
Table 28. Low-speed external user clock characteristics
(1)
1. Guaranteed by design, not tested in production
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
f
LSE_ext
User external clock source 
frequency
-
1
32.768
1000
kHz
V
LSEH
OSC32_IN input pin high level 
voltage
0.7V
DD
-
V
DD
V
V
LSEL
OSC32_IN input pin low level 
voltage
V
SS
-
0.3V
DD
t
w(LSE)
t
w(LSE)
OSC32_IN high or low time
465
-
-
ns
t
r(LSE)
t
f(LSE)
OSC32_IN rise or fall time
-
-
10
C
IN(LSE)
OSC32_IN input capacitance
-
-
0.6
-
pF
DuCy
(LSE)
Duty cycle
-
45
-
55
%
I
L
OSC32_IN Input leakage current  V
SS 
V
IN 
V
DD
-
-
±1
µA
ai18233b
OSC32_IN
EXTER NAL
STM32L1xx
CLOCK SOURC E
V
LSEH
t
f(LSE)
t
W(LSE)
I
L
90%
10%
T
LSE
t
t
r(LSE)
t
W(LSE)
f
LSE_ext
V
LSEL