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PCA9450 Arkusz danych(PDF) 60 Page - NXP Semiconductors |
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PCA9450 Arkusz danych(HTML) 60 Page - NXP Semiconductors |
60 / 96 page NXP Semiconductors PCA9450 Power management IC for i.MX 8M application processor family PCA9450 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2019. All rights reserved. Product data sheet Rev. 1.0 — 19 November 2019 60 / 96 • Crystal's ESR (typically 30 kΩ to 100 kΩ) • Tolerance (typically 5 ppm to 30 ppm) All of these crystal parameters can usually be found in the crystal datasheet. 9.2.2.2 Effective load capacitance The crystal oscillator (see Figure 24) uses two load capacitors, CL1 and CL2, as load for the crystal. These capacitors generate, together with the crystal's inductance, the required 180° phase shift of the feedback loop. aaa-035750 XTAL_IN 180° 180° XTAL_OUT 32.768 kHz Xtal CL2 CL2_P CL1 CL1_P Figure 24. Crystal oscillator From the view of the crystal, these capacitors are a serial connection through GND. Hence, if using two equal capacitors, the values of these capacitors must be twice the required load capacitance. It is also important to consider PCB parasitic capacitances for the calculation of the necessary capacitors according to Equation 5. (5) Where: • C’L1 = CL1 + CL1_P, CL1_P is PCB parasitic capacitance. • C’L2 = CL2 + CL2_P , CL2_P is PCB parasitic capacitance. When using equal capacitors for CL1 and CL2 and a symmetric layout with equal parasitic capacitance on both crystal pins, the effective load capacitance is shown in Equation 6. (6) Example: Crystal requires 12 pF load. |
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