Electrical characteristics STM32F038x6
56/102 DocID026079 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 16. 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 add one.
6.3.7 Internal clock source characteristics
The parameters given in Table 33 are derived from tests performed under ambient
temperature and supply voltage conditions summarized in Table 18: 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 32. LSE oscillator characteristics (f
LSE
= 32.768 kHz)
Symbol Parameter Conditions
(1)
Min
(2)
Typ Max
(2)
Unit
069
26&B,1
26&B287
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SURJUDPPDEOH
DPSOLILHU
I
/6(
N+]
UHVRQDWRU
5HVRQDWRUZLWKLQWHJUDWHG
FDSDFLWRUV
&
/
&
/
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