HD66520 Datasheet, PDF (1/45 Pages) Hitachi Semiconductor – 160-Channel 4-Level Grayscale Display Column Driver with Internal Bit-Map RAM

HD66520T
(160-Channel 4-Level Grayscale Display Column Driver with
Internal Bit-Map RAM)
Description
The HD66520 is a column driver for liquid crystal dot-matrix graphic display systems. This 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.
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 memory management: Packed pixel
• Internal bit-map display RAM: 76800 bits (160 × 240 lines × two planes)
• CPU interface
 SRAM interface
 Address bus: 16 bits, data bus: 8 bits
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