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CA3162 Arkusz danych(PDF) 5 Page - Intersil Corporation |
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CA3162 Arkusz danych(HTML) 5 Page - Intersil Corporation |
5 / 7 page 5 CA3162E Liquid Crystal Display (LCD) Application Figure 3 shows the CA3162E in a typical LCD application. LCDs may be used in favor of LED displays in applications requiring lower power dissipation, such as battery-operated equipment, or when visibility in high-ambient-light conditions is desired. Multiplexing of LCD digits is not practical, since LCDs must be driven by an AC signal and the average voltage across each segment is zero. Three CD4056B liquid-crystal decoder/drivers are therefore used. Each CD4056B contains an input latch so that the BCD data for each digit may be latched into the decoder using the inverted digit-select out- puts of the CA3162E as strobes. The capacitors on the outputs of inverters G3 and G4 filter out the decode spikes on the MSD and NSD signals. The capacitors and pull-up resistors connected to the MSD, NSD and LSD outputs are there to shorten the digit drive signal thereby providing proper timing for the CD4056B latches. Inverters G1 and G2 are used as an astable multivibrator to provide the AC drive to the LCD backplane. Inverters G3, G4 and G5 are the digit-select inverters and require pull-up resistors to interface the open-collector outputs of the CA3162E to CMOS logic. The BCD outputs of the CA3162E may be connected directly to the corresponding CD4056B inputs (using pull-up resistors). In this arrangement, the CD4056B decodes the negative sign (-) as an “L” and the positive overload indicator (E) as an “H”. The circuit as shown in Figure 3 using G7, G8 and G9 will decode the negative sign (-) as a negative sign (-), and the positive overload indicator (E) as “H”. FIGURE 3. TYPICAL LCD APPLICATION +5V TO LSD OF LCD +5V TO MSD OF LCD +5V TO NSD OF LCD 1 6 4 2 3 5 78 16 CD4056B 15k Ω 100k Ω 0.63 µF TO LCD BACKPLANE 1 6 4 2 3 5 78 16 CD4056B 1 6 4 2 3 5 78 16 CD4056B 0.047 0.27 µF ZERO 50k Ω “HOLD” VIN+ GAIN 10k Ω +5V 12 14 8 9 11 10 13 4 3 5 16 15 1 2 7 MSD VIN- NSD LSD 23 22 21 20 µF 0.047 µF G1 - G6: CD4049UB HEX INVERTER G7, G8, G9: CD4023B TRIPLE 3 INPUT NAND GATE 0.047 µF G7 G9 G8 0.047 µF 0.047 µF 4x 100k Ω 6x 10k Ω G3 G4 G5 +5V CA3162E CA3162 |
Podobny numer części - CA3162_02 |
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Podobny opis - CA3162_02 |
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