HD66710 Datasheet, PDF (46/73 Pages) Hitachi Semiconductor – (Dot Matrix Liquid Crystal Display Controller/Driver)

HD66710
Extension Driver LSI Interface
By bringing the EXT pin high, segment driver pins (SEG37 to SEG40) functions as the extended driver
interface outputs. From these pins, a latch pulse (CL1), a shift clock (CL2), data (D), and an AC signal
(M) are output. The same data is output from the SEG36 pin of the HD66710 and the start segment pin
(Seg1) of the extension driver. Due to the character baundary, the Seg1 output is used for the 5-dot font
width. For the 6-dot font width, the SEG36 output is used, and the Seg1 output of the extension driver
must not be used. When the extension driver LSI interface is used, ground level (GND) must be higher
than the V5 level.
Table 12 Required Number of 40-Output Extension Driver
Controller
HD66710*
HD44780
HD66702
Display Line
5-Dot Width
6-Dot Width
5-Dot Width
5-Dot Width
16 × 2 lines
Not required
1
1
Not required
20 × 2 lines
1
1
2
Not required
24 × 2 lines
1
2
2
1
40 × 2 lines
Disabled
Disabled
4
3
12 × 4 lines
1
1
Disabled
Disabled
16 × 4 lines
2
2
Disabled
Disabled
20 × 4 lines
2
3
Disabled
Disabled
Note: * The number of display lines can be extended to 30 × 2 lines or 20 × 4 lines.
1) 1-chip operation
(EXT = Low, 5-dot font width)
2) When using the extension driver
(EXT = High, 5-dot font width)
EXT
HD66710
SEG1–
SEG40
GND
COM1–
COM33
16 × 2-line display
SEG1–SEG40
V_CC
EXT
HD66710
SEG1–
SEG35
COM1–
COM33
24 × 2-line display
M
D
Seg1–
CL2
CL1
Seg35
Extension driver
Figure 22 HD66710 and the Extension Driver Connection
336