HT1647
Overview
HT1647 is a peripheral device specially designed for I/O type mC used to expand the display capability. The max. display segment of the device are 1024 patterns (64 segments and 16 commons).
- Operating voltage: 2.7V~5.2V Built-in 32kHz RC oscillator External 32.768kHz crystal oscillator or 32kHz frequency source input Standby current < 1mA at 3V, < 2mA at 5V Internal resistor type: 1/5 bias or 1/4 bias, 1/16 duty Two selectable LCD frame frequencies: 89Hz or 170Hz Max. 64´16 patterns, 64 segments and 16 commons Built-in bit-map display RAM: 2048 bits (=64´16´2 bits) Built-in internal resistor type bias generator Six-wire interface (four data wires) Eight kinds of time base/WDT selection Time base or WDT overflow output R/W address auto increment * * * * * * * * * *
- Built-in buzzer driver (2kHz/4kHz) Power down command reduces power consumption Software configuration feature Data mode and Command mode instructions Three data accessing modes Provides VLCD pin to adjust LCD operating voltage Provides three kinds of bias current programming Control of TN-type, STN-type LCDs and ECB-type LCDs Four-level gray scale output for TN-type, STN-type LCDs panel Four-color output for ECB-type LCDs panel Available in 100-pin QFP and in chip form
