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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AS8218 датащи(PDF) 48 Page - ams AG |
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AS8218 датащи(HTML) 48 Page - ams AG |
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48 / 123 page  Data Sheet AS8218 / AS8228 Revision 3.0, 31-May-06 Page 48 of 123 8.2 LCD Driver (LCDD) LCD Drive Voltage Level Generation VREG LBP0 LBP1 LBP2 LBP3 LSD0 LSD23 selvlcd VDD VSS MCU LCDD Control Data Register1 Data Register2 lcdd_pd Figure 6: LCD driver block diagram The on-chip LCD driver (LCDD) is a peripheral block, which interfaces to almost any liquid crystal display (LCD) having a multiplex rate of 4. It generates the drive signals to directly drive multiplexed LCDs containing up to four backplanes and up to 24 segments per backplane. The AS8218 has a 20 x 4 LCDD, while the AS8228 has a 24 x 4 LCDD. The data registers receive and store the display information, which is to be sent to the display. The LCDD control block decodes the information into the select lines for the single segments using a specific timing. The LCD voltage can be selected to adjust the contrast of the display, as required. The selvlcd[2:0] register bits enable the setting of the LCD contrast by selecting one of the defined LCD voltage levels. The contrast can be improved with a higher voltage, however the contrast is also dependent upon the crystal frequency. |
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