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AM3359 Datasheet(PDF) 110 Page - Texas Instruments |
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AM3359 Datasheet(HTML) 110 Page - Texas Instruments |
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110 / 236 page  AM335x (ZCZ Package) RTC_XTALIN VSS_RTC RTC_XTALOUT C 1 C 2 Optional R bias Optional R d Crystal AM335x (ZCE Package) RTC_XTALIN RTC_XTALOUT C 1 C 2 Optional R bias Optional R d Crystal AM3359, AM3358, AM3357 AM3356, AM3354, AM3352 SPRS717F – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com A. Oscillator components (Crystal, C1, C2, optional Rbias and Rd) must be located close to the AM335x package. Parasitic capacitance to the printed circuit board (PCB) ground and other signals should be minimized to reduce noise coupled into the oscillator. B. C1 and C2 represent the total capacitance of the respective PCB trace, load capacitor, and other components (excluding the crystal) connected to each crystal terminal. The value of capacitors C1 and C2 should be selected to provide the total load capacitance, CL, specified by the crystal manufacturer. The total load capacitance is CL = [(C1*C2)/(C1+C2)] + Cshunt, where Cshunt is the crystal shunt capacitance (C0) specified by the crystal manufacturer plus any mutual capacitance (Cpkg + CPCB) seen across the AM335x RTC_XTALIN and RTC_XTALOUT signals. For recommended values of crystal circuit components, see Table 4-5. Figure 4-11. OSC1 (ZCE Package) Crystal Circuit Schematic A. Oscillator components (Crystal, C1, C2, optional Rbias and Rd) must be located close to the AM335x package. Parasitic capacitance to the printed circuit board (PCB) ground and other signals should be minimized to reduce noise coupled into the oscillator. B. C1 and C2 represent the total capacitance of the respective PCB trace, load capacitor, and other components (excluding the crystal) connected to each crystal terminal. The value of capacitors C1 and C2 should be selected to provide the total load capacitance, CL, specified by the crystal manufacturer. The total load capacitance is CL = [(C1*C2)/(C1+C2)] + Cshunt, where Cshunt is the crystal shunt capacitance (C0) specified by the crystal manufacturer plus any mutual capacitance (Cpkg + CPCB) seen across the AM335x RTC_XTALIN and RTC_XTALOUT signals. For recommended values of crystal circuit components, see Table 4-5. Figure 4-12. OSC1 (ZCZ Package) Crystal Circuit Schematic 110 Power and Clocking Copyright © 2011–2013, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: AM3359 AM3358 AM3357 AM3356 AM3354 AM3352 |
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