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MC14578 Datasheet(PDF) 4 Page - Freescale Semiconductor, Inc |
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MC14578 Datasheet(HTML) 4 Page - Freescale Semiconductor, Inc |
4 / 8 page Sensors 4 Freescale Semiconductor MC14578 APPLICATIONS INFORMATION Figure 3. Low-Battery Detector EXAMPLE VALUES Near the switchpoint, the comparator output in the circuit of Figure 3. may chatter or oscillate. This oscillation appears on the signal labelled OUTPUT. In some cases, the oscillation in the transition region will not cause problems. For example, an MPU reading OUTPUT could sample the signal two or three times to ensure a solid level is attained. But, in a low battery detector, this probably is not necessary. To eliminate comparator chatter, hysteresis can be added as shown in Figure 4.. The circuit of Figure 4. requires slightly more operating current than the Figure 3. arrangement. Figure 4. Adding Hysteresis NOTE: IN + and IN – have very high input impedance. Interconnect to these pins should be as short as possible. OUTPUT Low-battery Indicator High = Battery Low Low = Battery Ok V + V + R1 R2 D1 R3 V + R4 3.9 M D2 R5 6.8 k 16 7 6 5 4 3 2 1 12 11 10 9 8 15 14 13 MC14578 VDD COMP OUT IN + NC IN A IN B OUT A OUT B IN C OUT C1 NC BUFF OUT IN – RBIAS VSS OUT C2 R1 R2 R3 Nominal Tip Point 470 k Ω 1.3 M Ω 20 k Ω 4.08 V 820 k Ω 1.2 M Ω 39 k Ω 5.05 V 1.2 M Ω 1.2 M Ω 62 k Ω 6.00 V 12 R6 15 R7 2 |
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