DocID026079 Rev 3 55/102
STM32F038x6 Electrical characteristics
79
Figure 15. Typical application with an 8 MHz crystal
1. R
EXT
value depends on the crystal characteristics.
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 32. 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).
069
26&B,1
26&B287
5
)
%LDV
FRQWUROOHG
JDLQ
I
+6(
5
(;7
0+]
UHVRQDWRU
5HVRQDWRUZLWKLQWHJUDWHG
FDSDFLWRUV
&
/
&
/
Table 32. LSE oscillator characteristics (f
LSE
= 32.768 kHz)
Symbol Parameter Conditions
(1)
Min
(2)
Typ Max
(2)
Unit
I
DD
LSE current consumption
LSEDRV[1:0]=00
lower driving capability
-0.50.9
µA
LSEDRV[1:0]= 01
medium low driving capability
--1
LSEDRV[1:0] = 10
medium high driving capability
--1.3
LSEDRV[1:0]=11
higher driving capability
--1.6
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