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CC3130 bảng dữ liệu(PDF) 31 Page - Texas Instruments |
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CC3130 bảng dữ liệu(HTML) 31 Page - Texas Instruments |
31 / 75 page 8.15.5.2 Slow Clock Using an External Clock When an RTC oscillator is present in the system, the CC3130 device can accept this clock directly as an input. The clock is fed on the RTC_XTAL_P line, and the RTC_XTAL_N line is held to VIO. The clock must be a CMOS- level clock compatible with VIO fed to the device. Figure 8-10 shows the external RTC input connection. RTC_XTAL_P RTC_XTAL_N Host system 32.768 kHz VIO 100 KΩ Copyright © 2017, Texas Instruments Incorporated Figure 8-10. External RTC Input Section 8.15.5.2.1 lists the external RTC digital clock requirements. 8.15.5.2.1 External RTC Digital Clock Requirements CHARACTERISTICS TEST CONDITIONS MIN TYP MAX UNIT Frequency 32768 Hz Frequency accuracy (Initial plus temperature plus aging) ±150 ppm tr, tf Input transition time tr, tf (10% to 90%) 100 ns Frequency input duty cycle 20% 50% 80% Vih Slow clock input voltage limits Square wave, DC coupled 0.65 × VIO VIO V Vil 0 0.35 × VIO Vpeak Input impedance Resistance 1 MΩ Capacitance 5 pF www.ti.com CC3130 SWRS227 – MARCH 2020 Copyright © 2020 Texas Instruments Incorporated Submit Document Feedback 31 |
Số phần tương tự - CC3130 |
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Mô tả tương tự - CC3130 |
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