Datasheet

Electrical characteristics STM32F765xx STM32F767xx STM32F768Ax STM32F769xx
140/255 DocID029041 Rev 6
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 32. Typical application with a 32.768 kHz crystal
G
m
_crit_max Maximum critical crystal g
m
LSEDRV[1:0]=00
Low drive capability
- - 0.48
µA/V
LSEDRV[1:0]=10
Medium low drive capability
- - 0.75
LSEDRV[1:0]=01
Medium high drive capability
--1.7
LSEDRV[1:0]=11
High drive capability
--2.7
t
SU
(2)
start-up time V
DD
is stabilized - 2 - s
1. Guaranteed by design.
2. Guaranteed by characterization results. t
SU
is the start-up time measured from the moment it is enabled
(by software) to a stabilized 32.768 kHz oscillation is reached. This value is measured for a standard
crystal resonator and it can vary significantly with the crystal manufacturer.
Table 45. LSE oscillator characteristics (f
LSE
= 32.768 kHz)
(1)
(continued)
Symbol Parameter Conditions Min Typ Max Unit
DLD
26&B 28 7
26&B ,1
I
/6(
&
/
5
)
670)
N+]
UHVRQDWRU
5HVRQDWRUZLWK
LQWHJUDWHGFDSDFLWRUV
%LDV
FRQWUROOHG
JDLQ
&
/
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