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USB3370 数据表(PDF) 15 Page - Microchip Technology |
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USB3370 数据表(HTML) 15 Page - Microchip Technology |
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15 / 75 page  2012 - 2015 Microchip Technology Inc. DS00001915B-page 15 USB3370 4.10 Regulator Output Voltages and Capacitor Requirement 4.11 Piezoelectric Resonator for Internal Oscillator The internal oscillator may be used with an external quartz crystal or ceramic resonator as described in Section 5.4. See Table 4-11 for the recommended crystal specifications. Note 4-11 The required bit rate accuracy for Hi-Speed USB applications is ±500 ppm as provided in the USB 2.0 Specification. This takes into account the effect of voltage, temperature, aging, etc. Note 4-12 This number includes the pad, the bond wire and the lead frame. Printed Circuit Board (PCB) capacitance is not included in this value. The PCB capacitance value and the capacitance value of the XO and REFCLK pins are required to accurately calculate the value of the two external load capacitors. Note 4-13 Refer to Section 5.4 and Figure 8-1 for more information. TABLE 4-10: REGULATOR OUTPUT VOLTAGES AND CAPACITOR REQUIREMENT Parameter Symbol Conditions MIN TYP MAX Units Regulator Output Voltage VDD33 5.5V > VBAT > 3.0V 2.8 3.3 3.6 V USB UART Mode & UART RegOutput[1:0] = 01 6V > VBAT > 3.0V 2.7 3.0 3.3 V USB UART Mode & UART RegOutput[1:0] = 10 6V > VBAT > 3.0V 2.47 2.75 3.03 V USB UART Mode & UART RegOutput[1:0] = 11 6V > VBAT > 3.0V 2.25 2.5 2.75 V Regulator Bypass Capacitor COUT33 1.0 uF Bypass Capacitor ESR CESR33 1 Ω Regulator Output Voltage VDD18 3.6V > VDD33 > 2.25V 1.6 1.8 2.0 V Regulator Bypass Capacitor COUT18 1.0 uF Bypass Capacitor ESR CESR18 1 Ω TABLE 4-11: USB3370 QUARTZ CRYSTAL SPECIFICATIONS Parameter Symbol MIN NOM MAX Units Notes Crystal Cut AT, typ Crystal Oscillation Mode Fundamental Mode Crystal Calibration Mode Parallel Resonant Mode Frequency Ffund -See Product Identification System on page 73 -MHz Total Allowable PPM Budget - - ±500 PPM Note 4-11 Shunt Capacitance CO -7 typ- pF Load Capacitance CL - 20 typ - pF Drive Level PW 0.1 - - mW Equivalent Series Resistance R1 -- 30 Ohm USB3370 REFCLK Pin Capacitance -3 typ- pF Note 4-12 USB3370 XO Pin Capacitance - 3 typ - pF Note 4-12 Recommended Resistance between XI and XO 1M - - Ohm Note 4-13 |
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