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SPEAR1340 Datasheet(PDF) 136 Page - STMicroelectronics |
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SPEAR1340 Datasheet(HTML) 136 Page - STMicroelectronics |
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136 / 200 page  Electrical characteristics SPEAr1340 136/200 Doc ID 023063 Rev 4 4.3.2 Real-time clock (RTC) External clock generated from a crystal oscillator Figure 8. 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 44. 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 12 25 µA/V tSU Startup time Stabilized power on RTC_VDD1V5 pin 1.5 fOSC_IN cycles GND 32.768 kHz CL1 CL2 (1) (1) RTC_XI RTC_XO |
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