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参数资料
型号： STM8L151R6T3DSTM8L151R6T3D
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, FLASH, 16 MHz, RISC MICROCONTROLLER, PQFP64
封装： 10 X 10 MM, ROHS COMPLIANT, LQFP-64
文件页数： 107/122页
文件大小： 1190K
代理商： STM8L151R6T3DSTM8L151R6T3D
STM8L15xx8, STM8L15xR6
Electrical parameters
Doc ID 17943 Rev 1
85/122
HSE crystal/ceramic resonator oscillator
The HSE clock can be supplied with a 1 to 16 MHz crystal/ceramic resonator oscillator. All
the information given in this paragraph is based on characterization results with specified
typical external components. 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
(frequency, package, accuracy...).
Figure 13.
HSE oscillator circuit diagram
HSE oscillator critical gm formula
Rm: Motional resistance (see crystal specification), Lm: Motional inductance (see crystal specification),
Cm: Motional capacitance (see crystal specification), Co: Shunt capacitance (see crystal specification),
CL1=CL2=C: Grounded external capacitance
gm >> gmcrit
Table 30.
HSE oscillator characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fHSE
High speed external oscillator
frequency
116
MHz
RF
Feedback resistor
200
k
Ω
C(1)
Recommended load capacitance (2)
20
pF
IDD(HSE)
HSE oscillator power consumption
C = 20 pF,
fOSC = 16 MHz
2.5 (startup)
0.7 (stabilized)(3)
mA
C = 10 pF,
fOSC =16 MHz
2.5 (startup)
0.46 (stabilized)(3)
gm
Oscillator transconductance
3.5
mA/V
tSU(HSE)
(4) Startup time
VDD is stabilized
1
ms
1.
C=CL1=CL2 is approximately equivalent to 2 x crystal CLOAD.
2.
The oscillator selection can be optimized in terms of supply current using a high quality resonator with small Rm value.
Refer to crystal manufacturer for more details
3.
Guaranteed by design. Not tested in production.
4.
tSU(HSE) is the startup time measured from the moment it is enabled (by software) to a stabilized 16 MHz oscillation. This
value is measured for a standard crystal resonator and it can vary significantly with the crystal manufacturer.
OSC_OUT
OSC_IN
fHSE to core
CL1
CL2
RF
STM8
Resonator
Consumption
control
gm
Rm
Cm
Lm
CO
Resonator
g
mcrit
2
Π
×
f
HSE
×
()2 R
m
×
2Co
C
+
()
2
=
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