Datasheet

Electrical characteristics STM32L476xx
156/270 DS10198 Rev 8
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 25. 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 58. 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).
MS19876V1
(1)
OSC_IN
OSC_OUT
R
F
Bias
controlled
gain
f
HSE
R
EXT
8 MHz
resonator
Resonator with integrated
capacitors
C
L1
C
L2
Table 58. LSE oscillator characteristics (f
LSE
= 32.768 kHz)
(1)
Symbol Parameter Conditions
(2)
Min Typ Max Unit
I
DD(LSE)
LSE current consumption
LSEDRV[1:0] = 00
Low drive capability
-250-
nA
LSEDRV[1:0] = 01
Medium low drive capability
-315-
LSEDRV[1:0] = 10
Medium high drive capability
-500-
LSEDRV[1:0] = 11
High drive capability
-630-
Gm
critmax
Maximum critical crystal
gm
LSEDRV[1:0] = 00
Low drive capability
--0.5
µA/V
LSEDRV[1:0] = 01
Medium low drive capability
- - 0.75
LSEDRV[1:0] = 10
Medium high drive capability
--1.7
LSEDRV[1:0] = 11
High drive capability
--2.7
t
SU(LSE)
(3)
Startup time V
DD
is stabilized - 2 - s
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