UPD16635 데이터 시트보기 (PDF) - NEC => Renesas Technology
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UPD16635 Datasheet PDF : 19 Pages
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µPD16635
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
0.2 V
VDD2
V0
V1
V2
V3
V4
Split interval
8
24
24
7
VCOM
V5
7
V6
24
V7
24
V8
8
0.2 V
V9
VSS2
00
08
10
18
20
28
30
38
3F
Input data (HEX)
6
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