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AM3359 Datasheet(PDF) 111 Page - Texas Instruments |
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AM3359 Datasheet(HTML) 111 Page - Texas Instruments |
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111 / 236 page  VDDS_RTC RTC_XTALOUT t sX CAP_VDD_RTC (min.) Time VSS_RTC VDDS_RTC (min.) VSS_RTC CAP_VDD_RTC AM3359, AM3358, AM3357 AM3356, AM3354, AM3352 www.ti.com SPRS717F – OCTOBER 2011 – REVISED APRIL 2013 Table 4-5. OSC1 Crystal Circuit Requirements NAME DESCRIPTION MIN TYP MAX UNIT fxtal Crystal parallel resonance Fundamental mode oscillation only 32.768 kHz frequency Crystal frequency stability Maximum RTC error = 10.512 minutes -20.0 20.0 ppm and tolerance per year Maximum RTC error = 26.28 minutes per -50.0 50.0 ppm year CC1 C1 capacitance 12.0 24.0 pF CC2 C2 capacitance 12.0 24.0 pF Cshunt Shunt capacitance 1.5 pF ESR Crystal effective series fxtal = 32.768 kHz, oscillator has nominal 80 k Ω resistance negative resistance of 725 k Ω and worst- case negative resistance of 250 k Ω Table 4-6. OSC1 Crystal Circuit Characteristics NAME DESCRIPTION MIN TYP MAX UNIT Cpkg Shunt capacitance of ZCE package 0.17 pF package ZCZ package 0.01 pF Pxtal The actual values of the ESR, fxtal, and CL should be used to yield a Pxtal = 0.5 ESR (2 π fxtal typical crystal power dissipation value. Using the maximum values CL VDDS_RTC) 2 specified for ESR, fxtal, and CL parameters yields a maximum power dissipation value. tsX Start-up time 2 s Figure 4-13. OSC1 Start-up Time Copyright © 2011–2013, Texas Instruments Incorporated Power and Clocking 111 Submit Documentation Feedback Product Folder Links: AM3359 AM3358 AM3357 AM3356 AM3354 AM3352 |
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