UPD16634A 데이터 시트보기 (PDF) - NEC => Renesas Technology
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UPD16634A Datasheet PDF : 20 Pages
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µPD16634A
5. RELATIONHIP 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’, V0” to V63” are roughly equal; and their respective
resistance values are as shown in Table 6-1. 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 5-1 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. Figure 6-1 and 6-2 show the
relationship between the input data and the output data.
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.
5
Figure 5-1. Relationship between Input Data and Output Voltage
VDD2
Split interval
V0
16
V1
V2
16
16
V3
15
V4
VCOM
V5
15
V6
16
V7
16
V8
16
V9
VSS2
00
08
10
18
20
28
30
38
3F
Input data (HEX)
6
Data Sheet S12595EJ2V0DS00
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