PD16715A_15 Datasheet, PDF (7/18 Pages) Renesas Technology Corp – 384-OUTPUT TFT-LCD SOURCE DRIVER(COMPATIBLE WITH 64-GRAY SCALES)

µ PD16715A
Cautions 1. The power start sequence must be VDD1, logic input, and VDD2 & V0 to V9 in that order. Reverse
this sequence to shut down. (Simultaneous power application to VDD2 and V0 to V9 is possible.)
2. To stabilize the supply voltage, please be sure to insert a 0.47 µF bypass capacitor between
VDD1-VSS1 and VDD2-VSS2. Furthermore, for increased precision of the D/A converter, insertion of a
bypass capacitor of about 0.01 µF is also advised between the γ -corrected power supply
terminals (V0, V1, V2, ···, V9) and VSS2.
5. RELATIONSHIP BETWEEN INPUT DATA AND OUTPUT VOLTAGE VALUE
The µPD16715A 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 next page. 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 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 > 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. Therefore, please do not
use it for γ - corrected power supply level inversion in double-sided mounting.
Figure 5−1. Relationship Between Input Data and γ - corrected Power Supply
0.1 V
VDD2
V0
8
V1
24
V2
V3
V4
VCOM
V5
V6
V7
24
7
Split interval
7
24
V8
V9
0.1 V
VSS2
00
08
24
8
20
38
3F
Input Data (HEX)
Data Sheet S13944EJ2V0DS00
5