Datasheet

Electrical characteristics STM32L010F4/K4
58/91 DS12323 Rev 2
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 Oscillator design guide
for STM8AF/AL/S and STM32 microcontrollers (AN2867) 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 add one.
Table 35. LSE oscillator characteristics
(1)
1. Guaranteed by design, not tested in production.
Symbol Parameter Conditions
(2)
2. Refer to the note and caution paragraphs below the table.
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)
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.
Startup time V
DD
is stabilized - 2 - s
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