STM32L152CBU6 查看數據表（PDF） - STMicroelectronics
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STM32L152CBU6
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STM32L152CBU6 Datasheet PDF : 133 Pages
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Electrical characteristics
STM32L151x6/8/B STM32L152x6/8/B
Table 28. HSE oscillator characteristics(1)(2)
Symbol
Parameter
Conditions
Min Typ
Max
Unit
fOSC_IN Oscillator frequency
-
1
RF Feedback resistor
-
200
Recommended load
C
capacitance versus
equivalent serial resistance
of the crystal (RS)(3)
RS = 30 Ω
- 20
IHSE HSE driving current
VDD= 3.3 V, VIN = VSS
with 30 pF load
-
-
IDD(HSE)
HSE oscillator power
consumption
C = 20 pF
fOSC = 16 MHz
C = 10 pF
fOSC = 16 MHz
--
--
gm Oscillator transconductance
Startup
3.5 -
tSU((4H)SE) Startup time
VDD is stabilized
-1
24
-
-
3
2.5 (startup)
0.7 (stabilized)
2.5 (startup)
0.46 (stabilized)
-
-
MHz
kΩ
pF
mA
mA
mA
/V
ms
1. Resonator characteristics given by the crystal/ceramic resonator manufacturer.
2. Guaranteed by characterization results.
3. The relatively low value of the RF resistor offers a good protection against issues resulting from use in a
humid environment, due to the induced leakage and the bias condition change. However, it is
recommended to take this point into account if the MCU is used in tough humidity conditions.
4.
otSsUc(iHllaSEtio) nis
the startup
is reached.
time
This
measured from the moment it is enabled (by software) to
value is measured for a standard crystal resonator and it
a stabilized 8 MHz
can vary significantly
with the crystal manufacturer.
For CL1 and CL2, it is recommended to use high-quality external ceramic capacitors in the
5 pF to 25 pF range (typ.), designed for high-frequency applications, and selected to match
the requirements of the crystal or resonator (see Figure 17). CL1 and CL2 are usually the
same size. The crystal manufacturer typically specifies a load capacitance which is the
series combination of CL1 and CL2. PCB and MCU pin capacitance must be included (10 pF
can be used as a rough estimate of the combined pin and board capacitance) when sizing
CL1 and CL2. Refer to the application note AN2867 “Oscillator design guide for ST
microcontrollers” available from the ST website www.st.com.
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DocID17659 Rev 12
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