Features: · Duty cycle: 1/64 to 1/240· Liquid crystal drive circuits: 160· Low-voltage logic circuit: 3.0 to 5.5-V operation power supply voltage· High-voltage liquid crystal drive circuit: 8 to 28-V liquid crystal drive voltage· Grayscale display: FRC four-level grayscale display· Grayscale memor...
HD66520: Features: · Duty cycle: 1/64 to 1/240· Liquid crystal drive circuits: 160· Low-voltage logic circuit: 3.0 to 5.5-V operation power supply voltage· High-voltage liquid crystal drive circuit: 8 to 28-...
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Item |
Symbol |
Ratings |
Unit |
Notes | |
Power voltage | Logic circuit LCD drive circuit |
VCC VEE |
0.3 to +7.0 VCC 30.0 to VCC + 0.3 |
V V |
1 |
Input voltage (1) Input voltage (2) |
VT1 VT2 |
0.3 to VCC + 0.3 VEE 0.3 to VCC + 0.3 |
V V |
1, 2 1, 3 | |
Operating temperature Storage temperature |
Topr Tstg |
20 to +75 40 to +125 |
|
The HD66520 is a column driver for liquid crystal dot-matrix graphic display systems. This HD66520 LSI incorporates 160 liquid crystal drive circuits and a 160 ´ 240 ´ 2-bit bit-map RAM, which is suitable for LCDs in portable information devices. It also includes a general-purpose SRAM interface so that draw access can be easily implemented from a general-purpose CPU. The HD66520 also has a new arbitration method which prevents flicker when the CPU performs draw access asynchronously. The on-chip display RAM greatly decreases power consumption compared to previous liquid crystal display systems because there is no need for high-speed data transfer. The chip also incorporates a four-level grayscale controller for enhanced graphics capabilities, such as icons on a screen.