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Z8E520 Datasheet(PDF) 15 Page - Zilog, Inc. |
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Z8E520 Datasheet(HTML) 15 Page - Zilog, Inc. |
15 / 43 page Z8E520/C520 Zilog 1.5 MBPS USB Device Controller DS97KEY2005 P R E L I M I N A R Y 15 1 Port B. Port B (0–5) includes a Quadrature configuration (Figure 9), with programmable current sink and an analog comparator with programmable reference voltages (Ta- bles 4–8). PORT B (0–5) QUADRATURE CONFIGURATION Figure 9. Port B (0–5) Quadrature Configuration Table 4. Programmable Voltage Threshold Symbol Parameter Min. Max. Units Conditions VR1 Voltage Reference 1 0.21 VCC 0.29 VCC V VR2 Voltage Reference 2 0.31 VCC 0.39 VCC V VR3 Voltage Reference 3 0.41 VCC 0.49 VCC V Ratio Ratio Accuracy 5 % Note (1) Note: 1. Greatest delta vs. specified delta. Pad AC AC Decode VR1 VR3 VR2 + V +V AC = Analog Comparator Mode |
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