HOLTEK
HT1620
RAM Mapping 32x4 LCD Controller for I/O uC
 Features
Logic operating voltage: 2.4V~3.3V Time base or WDT overflow output
LCD voltage: 3.6V~4.9V 8 kinds of time base/WDT clock source
Low operating current 3uA at 3V 32x4 LCD driver
External 32.768kHz crystal oscillator Built-in 32x4-bit display RAM
Selection of 1/2 or 1/3 bias, and selection 3-wire serial interface
---of 1/2 or 1/3 or 1/4 duty LCD Internal LCD driving frequency source
applications Software configuration feature
Internal time base frequency sources R/W address auto increment
Two selectable buzzer frequencies(2kHz/4kHz) Data mode and command mode instructions
Built-in capacitor type bias charge pump Three data accessing modes
 General Description
---The HT1620 is a 128 pattern (32x4), memory mapping, and multi-function LCD driver. The S/W
modules configuration feature of the HT1620 makes it suitable for multiple LCD applications
including LCD and display subsystems. Only three or four lines are required for the interface
between the host controller and the HT1620. The HT1620 consumes low operating current owing
to adopting capacitor type bias charge pump. The HT162X series have many kinds of products that
match various applications.