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MC145028DW bảng dữ liệu(PDF) 10 Page - Freescale Semiconductor, Inc |
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MC145028DW bảng dữ liệu(HTML) 10 Page - Freescale Semiconductor, Inc |
10 / 20 page MC145026 •MC145027•MC145028•SC41343•SC41344 MOTOROLA 10 RS CTC RTC 11 12 13 INTERNAL ENABLE Figure 9. Encoder Oscillator Information This oscillator operates at a frequency determined by the external RC network; i.e., f ≈ 1 2.3 RTC CTC′ (Hz) for 1 kHz ≤ f ≤ 400 kHz where: CTC′ = CTC + Clayout + 12 pF RS ≈ 2 RTC RS ≥ 20 k RTC ≥ 10 k 400 pF < CTC < 15 µF The value for RS should be chosen to be ≥ 2 times RTC. This range ensures that current through RS is insignificant compared to current through RTC. The upper limit for RS must ensure that RS x 5 pF (input capacitance) is small com- pared to RTC x CTC. For frequencies outside the indicated range, the formula is less accurate. The minimum recommended oscillation frequency of this circuit is 1 kHz. Sus- ceptibility to externally induced noise signals may occur for frequencies below 1 kHz and/or when resistors utilized are greater than 1 M Ω. Figure 10. Timing Diagram PWmin TE 2 WORD TRANSMISSION ENCODER CONTINUOUS TRANSMISSION ENCODER OSCILLATOR (PIN 12) Dout (PIN 15) VT (PIN 11) DATA OUTPUTS 1.1 (R2C2) DECODER ENCODING SEQUENCE 1ST DIGIT HIGH 2ND WORD 1ST WORD OPEN LOW 9TH DIGIT 9TH DIGIT 1ST DIGIT |
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