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STM8AL3136 Datasheet(PDF) 75 Page - STMicroelectronics |
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STM8AL3136 Datasheet(HTML) 75 Page - STMicroelectronics |
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75 / 124 page  DocID18474 Rev 7 75/124 STM8AL313x/4x/6x STM8AL3L4x/6x Electrical parameters 108 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 15. HSE oscillator circuit diagram HSE oscillator critical gm formula gmcrit 2 Π × fHSE × ()2 Rm × 2Co C + () 2 = Table 32. HSE oscillator characteristics Symbol Parameter Conditions Min Typ Max Unit fHSE High speed external oscillator frequency -1 - 16 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(3) -- 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. Data 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. |
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