Datasheet

Electrical characteristics STM32F410x8/B
82/142 DocID028094 Rev 5
The LSE high-power mode allows to cover a wider range of possible crystals but with a cost
of higher power consumption.
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.
For information about the LSE high-power mode, refer to the reference manual RM0401.
Figure 22. Typical application with a 32.768 kHz crystal
Table 41. LSE oscillator characteristics (f
LSE
= 32.768 kHz)
(1)
1. Guaranteed by design.
Symbol Parameter Conditions Min Typ Max Unit
R
F
Feedback resistor - - 18.4 - MΩ
I
DD
LSE current consumption
Low-power mode
(default)
--1
µA
High-drive mode - - 3
G
m
_crit_max Maximum critical crystal g
m
Startup, low-power
mode
- - 0.56
µA/V
Startup, high-drive
mode
- - 1.50
t
SU(LSE)
(2)
2. 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 guaranteed by characterization. It is measured for a
standard crystal resonator and it can vary significantly with the crystal manufacturer.
startup time V
DD
is stabilized - 2 - s
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