Datasheet

Electrical characteristics STM32L011x3/4
66/119 DocID027973 Rev 5
time. Refer to the crystal resonator manufacturer for more details on the resonator
characteristics (frequency, package, accuracy).
Note: For information on selecting the crystal, refer to the application note AN2867 “Oscillator
design guide for ST microcontrollers” available from the ST website http://www.st.com.
Figure 21. 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.
Table 37. LSE oscillator characteristics
(1)
Symbol Parameter Conditions
(2)
Min
(2)
Typ Max Unit
f
LSE
LSE oscillator frequency - 32.768 - kHz
G
m
Maximum critical crystal
transconductance
LSEDRV[1:0]=00
lower driving capability
--0.5
µA/V
LSEDRV[1:0]= 01
medium low driving capability
- - 0.75
LSEDRV[1:0] = 10
medium high driving capability
--1.7
LSEDRV[1:0]=11
higher driving capability
--2.7
t
SU(LSE)
(3)
Startup time V
DD
is stabilized - 2 - s
1. Guaranteed by design, not tested in production.
2. Refer to the note and caution paragraphs below the table, and to the application note AN2867 “Oscillator design guide for ST
microcontrollers”.
3. Guaranteed by characterization results, not tested in production. 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
resonator and it can vary significantly with the crystal manufacturer. To increase speed, address a lower-drive quartz with a
high- driver mode.
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