UPD16633B 데이터 시트보기 (PDF) - NEC => Renesas Technology
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UPD16633B Datasheet PDF : 20 Pages
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µPD16633B
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.
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 mounting. Therefore, please do not use it for γ-corrected power supply
level inversion in double-sided mounting. Because the current flowing through ladder resistors r0 to r62 is small, its
use for double-sided mounting impairs the IC’s stable operation when the level of the γ-corrected power supply
terminal is inverted thus causing display failures.
Figure 1. Relationship Between Input Data and Output Voltage
0.1 V
VDD2
V0
V1
V2
V3
V4
VCOM
V5
V6
V7
V8
V9
0.1 V
VSS2
00
08
10
18
20
28
30
38
3F 40 (Invalid)
Input data (HEX)
(POL2 = L)
6
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