Datasheet

Electrical characteristics STM32F446xC/E
106/202 DocID027107 Rev 6
possible to the oscillator pins in order to minimize output distortion and startup stabilization
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 www.st.com.
Figure 26. Typical application with a 32.768 kHz crystal
Table 40. 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 - - - 1 µA
ACC
LSE
(2)
2. This parameter depends on the crystal used in the application. Refer to application note AN2867.
LSE accuracy - -500 - 500 ppm
G
m
_crit_max
Maximum critical crystal
g
m
Startup low-power mode - - 0.56
µA/V
Startup high-drive mode - - 1.5
t
SU(LSE)
(3)
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 guaranteed based on test during 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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