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STM32F479IIT6 数据手册 - ST Microelectronics（意法半导体）
制造商:
ST Microelectronics（意法半导体）
分类:
微控制器
封装:
LQFP-176
描述:
ARM微控制器 - MCU 16/32-BITS MICROS
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STM32F479IIT6数据手册
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STM32F479xx Electrical characteristics
190
Low-speed external clock generated from a crystal/ceramic resonator
The low-speed external (LSE) clock can be supplied with a 32.768 kHz crystal/ceramic
resonator oscillator. All the informations given in this paragraph are based on
characterization results obtained with typical external components specified in Table 38.
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).
Note: For information on selecting the crystal, refer to the application note AN2867 “Oscillator
design guide for ST microcontrollers” available from www.st.com.
Figure 32. Typical application with a 32.768 kHz crystal
Table 38. 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
Low power mode
(2)
2. LSE mode cannot be changed “on the fly” otherwise, a glitch can be generated on OSCIN pin.
--1
µA
High drive mode
(2)
--3
ACC
LSE
(3)
3. 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
Low power mode
(2)
- - 0.56
µA/V
High drive mode
(2)
--1.5
t
SU(LSE)
(4)
4. 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 based on characterization and not tested in production. 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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