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TC7106ACLW Folha de dados(PDF) 10 Page - Microchip Technology |
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TC7106ACLW Folha de dados(HTML) 10 Page - Microchip Technology |
10 / 34 page TC7106/A/TC7107/A DS21455D-page 10 © 2008 Microchip Technology Inc. 5.0 DIGITAL SECTION (TC7106A) The TC7106A (Figure 5-2) contains all the segment drivers necessary to directly drive a 3-1/2 digit liquid crystal display (LCD). An LCD backplane driver is included. The backplane frequency is the external clock frequency divided by 800. For three conversions per second, the backplane frequency is 60Hz with a 5V nominal amplitude. When a segment driver is in phase with the backplane signal, the segment is “OFF.” An out of phase segment drive signal causes the segment to be “ON” or visible. This AC drive configuration results in negligible DC voltage across each LCD segment. This insures long LCD display life. The polarity segment driver is “ON” for negative analog inputs. If VIN+ and VIN- are reversed, this indicator will reverse. When the TEST pin on the TC7106A is pulled to V+, all segments are turned “ON.” The display reads -1888. During this mode, the LCD segments have a constant DC voltage impressed. DO NOT LEAVE THE DISPLAY IN THIS MODE FOR MORE THAN SEVERAL MINUTES! LCD displays may be destroyed if operated with DC levels for extended periods. The display font and the segment drive assignment are shown in Figure 5-1. FIGURE 5-1: Display Font and Segment Assignment In the TC7106A, an internal digital ground is generated from a 6-volt zener diode and a large P channel source follower. This supply is designed to absorb the large capacitive currents when the backplane voltage is switched. Display Font 1000s' 100s' 10s' 1s' |
Nº de peça semelhante - TC7106ACLW |
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Descrição semelhante - TC7106ACLW |
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