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SPEAR320S-2 数据表(PDF) 73 Page - STMicroelectronics |
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SPEAR320S-2 数据表(HTML) 73 Page - STMicroelectronics |
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73 / 113 page  SPEAr320S Electrical characteristics Doc ID 022508 Rev 2 73/113 Example: For this example, a Fox Electronics, NC26LF-327 32.768 kHz oscillator has been used. For the Fox Electronics, NC26LF-327 crystal, CL = 12.5 pF With CS = ~0.1 pF, we have: Cext = CL1 = CL2 = 24.8 pF=22 pF RTC clock generated from an external clock source Table 43. RTC external user clock source characteristics Symbol Parameter Condition Min Typ Max Unit fRTC_XI External clock source frequency 32.768 kHz VRTC_XIH RTC_XI input pin high level voltage RTC_VDD1V5 - 0.2 RTC_VDD1V5 V VRTC_XIL RTC_XI input pin low level voltage RTC_GND 0.2 V DuCy(RTC_XI) Duty cycle 40 60 % tr(RTC_XI) tf(RTC_XI) RTC_XI input rise and fall time 50 ns CIN(RTC_XI) RTC_XI input capacitance 5pF IL(RTC_XI) RTC_XI input leakage RTC_GND ≤V IN≤ RTC_VDD1V5 ±1µA |
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