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MM5453V Datasheet(PDF) 6 Page - National Semiconductor (TI) |
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MM5453V Datasheet(HTML) 6 Page - National Semiconductor (TI) |
6 / 9 page Functional Description (Continued) Figure 9 shows a four wire remote display that takes advan- tage of the device’s serial input to move many bits of display information on a few wires. USING AN EXTERNAL CLOCK The MM5452/MM5453 LCD Drivers can be used with an externally supplied clock, provided it has a duty cycle of 50%. Deviations from a 50% duty cycle result in an offset voltage on the LCD. In Figure 8, a flip-flop is used to assure a 50% duty cycle. The oscillator input is grounded to prevent oscillation and reduce current consumptions in the chips. The oscillator is not used. Using an external clock allows synchronizing the display drive with AC power, internal clocks, or DVM integration time to reduce interference from the display. Figure 10 is a general block diagram that shows how the device’s serial input can be used to advantage in an analog display. The analog voltage input is compared with a stair- case voltage generated by a counter and a digital-to-analog 00613707 *The minimum recommended value for R for the oscillator input is 9 k Ω. An RC time constant of approximately 4.91 x 10−4 should produce a backplane frequency between 30 Hz and 150 Hz. FIGURE 7. Parallel Backplane Outputs 00613708 FIGURE 8. External Backplane Clock www.national.com 6 |
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