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PIC16LC55A-04I Datasheet(PDF) 17 Page - Microchip Technology |
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PIC16LC55A-04I Datasheet(HTML) 17 Page - Microchip Technology |
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17 / 192 page  1997-2013 Microchip Technology Inc. Preliminary DS30453E-page 17 PIC16C5X 4.4 RC Oscillator For timing insensitive applications, the RC device option offers additional cost savings. The RC oscillator frequency is a function of the supply voltage, the resis- tor (REXT) and capacitor (CEXT) values, and the operat- ing temperature. In addition to this, the oscillator frequency will vary from unit to unit due to normal pro- cess parameter variation. Furthermore, the difference in lead frame capacitance between package types will also affect the oscillation frequency, especially for low CEXT values. The user also needs to take into account variation due to tolerance of external R and C compo- nents used. Figure 4-5 shows how the R/C combination is con- nected to the PIC16C5X. For REXT values below 2.2 k , the oscillator operation may become unstable, or stop completely. For very high REXT values (e.g., 1 M ) the oscillator becomes sensitive to noise, humidity and leakage. Thus, we recommend keeping REXT between 3 k and 100 k. Although the oscillator will operate with no external capacitor (CEXT = 0 pF), we recommend using values above 20 pF for noise and stability reasons. With no or small external capacitance, the oscillation frequency can vary dramatically due to changes in external capacitances, such as PCB trace capacitance or pack- age lead frame capacitance. The Electrical Specifications sections show RC fre- quency variation from part to part due to normal pro- cess variation. The variation is larger for larger R (since leakage current variation will affect RC frequency more for large R) and for smaller C (since variation of input capacitance will affect RC frequency more). Also, see the Electrical Specifications sections for vari- ation of oscillator frequency due to VDD for given REXT/ CEXT values as well as frequency variation due to oper- ating temperature for given R, C, and VDD values. The oscillator frequency, divided by 4, is available on the OSC2/CLKOUT pin, and can be used for test pur- poses or to synchronize other logic. FIGURE 4-5: RC OSCILLATOR MODE Note: If you change from this device to another device, please verify oscillator characteris- tics in your application. VDD REXT CEXT VSS OSC1 Internal clock OSC2/CLKOUT Fosc/4 PIC16C5X N |
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