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数据搜索系统，热门电子元器件搜索 |
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SPEAR320S-2 数据表(PDF) 72 Page - STMicroelectronics |
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SPEAR320S-2 数据表(HTML) 72 Page - STMicroelectronics |
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72 / 113 page  Electrical characteristics SPEAr320S 72/113 Doc ID 022508 Rev 2 4.6.2 Real-time clock (RTC) RTC clock generated from a crystal oscillator Figure 5. RTC crystal connection 1. CL1 and CL2 are the load capacitors. The value of the capacitors depends on the type of the selected crystal. To calculate the value of the load capacitance, use the formula given below. Formula C L C L1 C L2 × C L1 C L2 + -------------------------- C s + = Where CL1 and CL2 are the load capacitors and CS is the circuit stray capacitance. In our application: CL1 = CL2 = Cext This implies: Cext = (CL-CS)*2 Table 42. RTC oscillator characteristics Symbol Parameter Condition Min Typ Max Unit fOSC_IN Oscillator frequency 32.768 kHz ESR Equivalent series resistance 6000 Ω gm Oscillator transconductance Startup 5 µA/V tSU Startup time Stabilized power on RTC_VDD1V5 pin 17000 fOSC_IN cycles GND 32.768 kHz CL1 CL2 (1) (1) RTC_XI RTC_XO |
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