E202075_HD404889 Datasheet, PDF (184/202 Pages) Renesas Technology Corp – Low-Voltage AS Microcomputers with On-Chip LCD Circuit

HD404889/HD404899/HD404878/HD404868 Series
LCD Circuit Characteristics (HD404888, HD4048812, HD404889, HD404898, HD4048912,
HD404899, HD404874, HD404878, HD404864, HD404868: V_CC=1.8V to 5.5V, GND=0V, T_a= –20°C to
+75°C; HCD404889, HCD404899, HCD404878: V_CC =1.8V to 5.5V, GND=0V, Ta=+75°C;
HD4074889, HD4074899, HD4074869: V_CC=2.0V to 5.5V, GND=0V, T_a=–20°C to +75°C, unless
otherwise specified)
Item
Symbol Pins
min.
typ. max.
Unit Test conditions
Notes
Segment driver voltage V_DS
SEG1 to
—
— 0.6
V
I_d=3 µA
1, 2
drop
SEG32
V₁=2.7 to 5.5V
SEG1 to
1, 3
SEG24
Common driver voltage V_DC
COM1 to
—
— 0.3
V
I_d=3 µA
1
drop
COM4
V₁=2.7 to 5.5V
LCD power supply
R_W
dividing resistance
50
300 900
kΩ
V₁-GND
LCD voltage
V_LCD
V₁
2.2
— V_CC
V
4, 5
Notes: 1. The voltage drop from power supply pins V₁, V₂, V₃, and GND to each segment pin or each
common pin.
2. Applies to the HD404889, HD404899, and HD404878 Series.
3. Applies to the HD404868 Series.
4. In the HD404889, HD404899, and HD404878 Series, when V_LCD is supplied by the internal power
supply, V₀ and V₁ should be shorted. When V_LCD is supplied by an external power supply, the
relationship V_CC ≥ V_LCD ≥ 2.2 V should be maintained. In this case, the V₀ pin should be fixed at
V_CC.
5. In the HD404868 Series, when V_LCD is supplied by an external power supply, the relationship V_CC
≥ V_LCD ≥ 2.2 V should be maintained.
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