STM32F373C8 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
STM32F373C8
STMicroelectronics
'STM32F373C8' PDF : 131 Pages View PDF
Electrical characteristics
STM32F373xx
Low-speed external clock generated from a crystal resonator
The low-speed external (LSE) clock can be supplied with a 32.768 kHz crystal resonator
oscillator. All the information given in this paragraph are based on design simulation results
obtained with typical external components specified in Table 41. In the application, the
resonator and the load capacitors have to be placed as close as 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).
Symbol
Table 41. LSE oscillator characteristics (fLSE = 32.768 kHz)
Parameter
Conditions(1)
Min(2) Typ Max(2) Unit
LSEDRV[1:0]=00
lower driving capability
-
0.5 0.9
IDD LSE current consumption
LSEDRV[1:0]= 10
medium low driving capability
LSEDRV[1:0] = 01
medium high driving capability
-
-
1
µA
-
-
1.3
LSEDRV[1:0]=11
higher driving capability
-
-
1.6
LSEDRV[1:0]=00
lower driving capability
5
-
-
gm
Oscillator
transconductance
LSEDRV[1:0]= 10
medium low driving capability
LSEDRV[1:0] = 01
medium high driving capability
8
-
15
-
-
µA/V
-
LSEDRV[1:0]=11
higher driving capability
25
-
-
tSU(LSE)(3) Startup time
VDD 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.
3.
rteSaUc(LhSeEd).
is the startup
This value is
time measured
measured for a
from the moment it is enabled (by software)
standard crystal and it can vary significantly
to a stabilized 32.768 kHz oscillation
with the crystal manufacturer
is
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.
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DocID022691 Rev 7
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