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Electrical characteristics STM32F071CB STM32F071RB STM32F071VB STM32F071V8
68/121 DocID025451 Rev 3
Note: For information on selecting the crystal, refer to the application note AN2867 “Oscillator
design guide for ST microcontrollers” available from the ST website www.st.com.
Figure 17. Typical application with a 32.768 kHz crystal
Note: An external resistor is not required between OSC32_IN and OSC32_OUT and it is forbidden
to ad
d one.
6.3.8 Internal clock source characteristics
The parameters given in Table 40 are derived from tests performed under ambient
temperature and supply voltage conditions summarized in Table 23: General operating
conditions. The provided curves are characterization results, not tested in production.
g
m
Oscillator
transconductance
LSEDRV[1:0]=00
lower driving capability
5- -
µA/V
LSEDRV[1:0]= 01
medium low driving capability
8- -
LSEDRV[1:0] = 10
medium high driving capability
15 - -
LSEDRV[1:0]=11
higher driving capability
25 - -
t
SU(LSE)
(3)
Startup time V
DDIOx
is stabilized - 2 - s
1. Refer to the note and caution paragraphs below the table, and to the application note AN2867 “Oscillator design guide for
ST microcontrollers”.
2. Guaranteed by design, not tested in production.
3. t
SU(LSE)
is the startup time measured from the moment it is enabled (by software) to a stabilized 32.768 kHz oscillation is
reached. This value is measured for a standard crystal and it can vary significantly with the crystal manufacturer
Table 39. LSE oscillator characteristics (f
LSE
= 32.768 kHz)
Symbol Parameter Conditions
(1)
Min
(2)
Typ Max
(2)
Unit
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STM32F071VBT6 数据手册

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