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IL8190N Datasheet(PDF) 7 Page - IK Semicon Co., Ltd |
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IL8190N Datasheet(HTML) 7 Page - IK Semicon Co., Ltd |
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7 / 11 page  IL8190N tDCHG VCC VREG FREQIN SQOUT ICP+ VCP+ T tCHG Figure 7. Timing Diagram of FREQIN and ICP Ripple voltage on the V/F output causes pointer or needle flutter especially at low input frequencies. The response time of the V/F is determined by the time constant formed by RT and C4. Increasing the value of C4 will reduce the ripple on the V/F output but will also increase the response time. An increase in response time causes a very slow meter movement and may be unacceptable for many applications. The IL8190N has an undervoltage detect circuit that disables the input comparator when VCC falls below 8.0 V (typical). With no input signal the V/F output voltage decreases and the needle moves towards zero. A second undervoltage detect circuit at 6.0 V(typical) causes the function generator to generate a differential SIN drive voltage of zero volts and the differential COS drive voltage to go as high as possible. This combination of voltages (Figure 1) across the meter coil moves the needle to the 0 ° position. Connecting a large capacitor(> 2000 µF) to the VCC lead (C2 in Figure 8) increases the time between these undervoltage points since the capacitor discharges slowly and ensures that the needle moves towards 0 ° as opposed to 360°. The exact value of the capacitor depends on the response time of the system, he maximum meter deflection and the current consumption of the circuit. It should be selected by breadboarding the design in the lab. 7 |
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