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PD16635 Scheda tecnica(PDF) 8 Page - Renesas Technology Corp |
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PD16635 Scheda tecnica(HTML) 8 Page - Renesas Technology Corp |
8 / 22 page µPD16635 6 5. RELATIONSHIP BETWEEN INPUT DATA AND OUTPUT VOLTAGE VALUE This product incorporates a 6-bit D/A converter whose odd output pins and even output pins output respectively gray scale voltages of differing polarity with respect to the LCD’s counter electrode (common electrode) voltage. The D/A converter consists of ladder resistors and switches. The ladder resistors r0 to r62 are so designed that the ratios between the LCD panel’s γ -corrected voltages and V0’ to V63’ and V0” to V63” are roughly equal; and their respective resistance values are as shown on page 9. Among the 5-by-2 γ -corrected voltages, input gray scale voltages of the same polarity with respect to the common voltage, for the respective five γ -corrected voltages of V0 to V4 and V5 to V9. If fine gray scale voltage precision is not necessary, the voltage follower circuit supplied to the γ -corrected power supplies V1 to V3 and V6 to V8 can be deleted. Figure 1 shows the relationship between the driving voltages such as liquid-crystal driving voltages VDD2 and VSS2, common electrode potential VCOM, and γ -corrected voltages V0 to V9 and the input data. Be sure to maintain the voltage relationships of VDD2 > V0 > V1 > V2 > V3 > V4 > V5 > V6 > V7 > V8 > V9 > VSS2. Figures 2-1 and 2- 2 show the relationship between the input data and the output data. Table 1 shows the resistance values of the resistor strings. This driver IC is designed for single-sided dot inversion mounting. Therefore, it cannot be used in double- sided mounting. Figure 1. Relationship Between Input Data and Output Voltage VDD2 0.2 V V1 V2 V3 V4 VCOM V5 V6 V7 V8 0.2 V VSS2 00 08 10 18 20 28 30 38 3F Input data (HEX) 8 24 24 7 7 24 24 8 Split interval V0 V9 |
Codice articolo simile - PD16635_15 |
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Descrizione simile - PD16635_15 |
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