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MCP795W21 数据表(PDF) 37 Page - Micro Analog systems |
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MCP795W21 数据表(HTML) 37 Page - Micro Analog systems |
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37 / 54 page  2011 Microchip Technology Inc. Preliminary DS22280A-page 37 MCP795WXX/MCP795BXX 9.2 Crystal Specification and Selection The MCP795XXX has been designed to operate with a standard 32.768 kHz tuning fork crystal. The on-board oscillator has been characterized to operate with a crystal of maximum ESR of 70K Ohms. Crystals with a comparable specification are also suit- able for use with the MCP795XXX. The table below is given as design guidance and a starting point for crystal and capacitor selection. EQUATION 9-1: The following must also be taken into consideration: • Pin capacitance (to be included in Cx2 and Cx1) • Stray Board Capacitance The recommended board layout for the oscillator area is shown in Figure 9-9. This actual board shows the crystal and the load capacitors. In this example, C2 is CX1, C1 is CX2 and the crystal is designated as Y1. When calculating the effective load capacitance, Equation 9-1 can be used. FIGURE 9-9: BOARD LAYOUT Gerber files are available on request. Please contact your Microchip Sales representative. It is required that the final application should be tested with the chosen crystal and capacitor combinations across all operating and environmental conditions. Please also consult with the crystal specification to observe correct handling and reflow conditions and for information on ideal capacitor values. For more information please see the RTCC Best Practices AN1365 (DS01365). Manufacturer Part Number Crystal Capacitance CX1 Value CX2 Value Micro Crystal CM7V-T1A 7pF 10pF 12pF Citizen CM200S-32.768KDZB-UT 6pF 10pF 8 pF Please work with your crystal vendor. Cload CX2 CX1 CX2 CX1 + ----------------------------- Cstray + = |
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