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STA8135G Datasheet(PDF) 27 Page - STMicroelectronics |
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STA8135G Datasheet(HTML) 27 Page - STMicroelectronics |
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27 / 41 page  Figure 5. Power-up strategy 4.5 RTC32.768 kHz oscillator specifications The 32.768 kHz OSCI32 oscillator is connected between RTC_XTI (oscillator amplifier input) and RTC_XTO (oscillator amplifier output). It also requires two external capacitors of 18 pF (using crystal with recommended characteristics as per Table 23) as shown in the Figure 6. The recommended oscillator specifications are shown in the table below: Table 23. Crystal recommended specifications Symbol Parameter Min. Typ. Max. Unit FSXTAL Crystal frequency 32.768 kHz LMSXTAL Motion inductance(1) 3500 5 6500 kHz CMSXTAL Motional capacitance(1) 4.0 5.0 6.0 fF COSXTAL Shunt capacitance(1) 1.0 1.3 1.6 pF ESR Resonance resistance(1) 80 kΩ CL External load capacitance 18 ±2% pF 1. Specified by design, not tested in production. STA8135G Electrical specifications DS14788 - Rev 1 page 27/41 |
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