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STM32F405OE Datasheet(PDF) 98 Page - STMicroelectronics

Part No. STM32F405OE
Description  ARM Cortex-M4 32b MCUFPU, 210DMIPS, up to 1MB Flash/1924KB RAM, USB OTG HS/FS
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32F405OE Datasheet(HTML) 98 Page - STMicroelectronics

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Electrical characteristics
STM32F405xx, STM32F407xx
98/185
DocID022152 Rev 4
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 32). 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.
Note:
For information on electing 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 an 8 MHz crystal
1. REXT value depends on the crystal characteristics.
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 information given in this paragraph are based on
characterization results obtained with typical external components specified in Table 32. 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).
Table 31. HSE 4-26 MHz oscillator characteristics(1) (2)
1. Resonator characteristics given by the crystal/ceramic resonator manufacturer.
2. Based on characterization, not tested in production.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fOSC_IN Oscillator frequency
4
-
26
MHz
RF
Feedback resistor
-
200
-
k
Ω
IDD
HSE current consumption
VDD=3.3 V,
ESR= 30 Ω,
CL=5 pF@25 MHz
-449
-
µA
VDD=3.3 V,
ESR= 30 Ω,
CL=10 pF@25 MHz
-532
-
gm
Oscillator transconductance
Startup
5
-
-
mA/V
tSU(HSE(3)
3. tSU(HSE) is the startup time measured from the moment it is enabled (by software) to a stabilized 8 MHz
oscillation is reached. This value is measured for a standard crystal resonator and it can vary significantly
with the crystal manufacturer
Startup time
VDD is stabilized
-
2
-
ms
ai17530
OSC_OU T
OSC_IN
fHSE
CL1
RF
STM32F
8 MH z
resonator
Resonator with
integrated capacitors
Bias
controlled
gain
REXT(1)
CL2


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