HD66720 Description
The HD66720 dot-matrix liquid crystal display controller (LCD) and driver LSI incorporates a key-scan function and an LED display function, and displays alphanumeric character and symbols. A single HD66720 is capable of displaying a single 10-character line or two 8-character lines. In addition, a single line of up to 40 characters can be displayed with extension drivers.
HD66720 Key Features
- Control and drive of a dot matrix LCD with built-in scanning
- Wide field-of-division display with low duty cycle of 1/9 (1 line) and 1/17 (2 lines)
- 10-character single line (5 × 8-dot font) and 50-segment display with a single chip (two 8-character line display by set
- Maximum 40-character single line display with extension drivers (see list 1)
- Built-in key scan matrix buffer circuit: 5 × 6 (30 keys) input (at strobe cycle: 5 ms to 40 ms, fosc = 160 kHz)
- Wake-up function with IRQ signal after key stroke
- Two general purpose output ports (for LED displays, etc.)
- Serial bus interface: Three-line clock synchronous serial transfer
- Booster for liquid crystal drive voltage: Two/ three times power supply
- Maximum 40-character display RAM