UPD16772A 데이터 시트보기 (PDF) - NEC => Renesas Technology
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UPD16772A Datasheet PDF : 20 Pages
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µPD16772A
5. RELATIONSHIP BETWEEN INPUT DATA AND OUTPUT VOLTAGE VALUE
The µ PD16772A 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 designed so that the ratio of LCD panel γ -compensated voltages to V0’ to V63’
and V0” to V63” is almost equivalent. For the 2 sets of five γ -compensated power supplies, V0 to V4 and V5 to V9,
respectively, input gray scale voltages of the same polarity with respect to the common voltage. When fine gray
scale voltage precision is not necessary, there is no need to connect a voltage follower circuit to the γ -compensated
power supplies V1 to V3 and V6 to V8.
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 – 0.1 V > V0 > V1 > V2 > V3 > V4 > 0.5 VDD2 > V5 > V6 > V7 > V8 > V9 > VSS2 + 0.1 V
Figures 5–2 and 5–3 show the relationship between the input data and the output voltage and the resistance values
of the resistor strings.
Figure 5–1. Relationship between Input Data and γ -corrected Power Supplies
0.1 V
VDD2
V0
V1
V2
V3
V4
VCOM
V5
V6
V7
V8
16
16
16
15
Split interval
15
16
16
16
0.1 V
V9
VSS2
00
10
20
30
3F
Input data (HEX)
6
Data Sheet S14725EJ1V0DS00
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