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STM32F405XX Datasheet(PDF) 98 Page - STMicroelectronics |
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STM32F405XX Datasheet(HTML) 98 Page - STMicroelectronics |
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98 / 185 page  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 |
Similar Part No. - STM32F405XX_13 |
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Similar Description - STM32F405XX_13 |
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