HT1621B Datasheet PDF - Holtek

●General Description

●The HT1621 is a 128 pattern (324), memory mapping, and multi-function LCD driver. The S/W configuration

●feature of the HT1621 makes it suitable for multiple LCD applications including LCD modules and display sub

●systems. Only three or four lines are required for the in terface between the host controller and the HT1621.

●The HT1621 contains a power down command to reduce power consumption.

●Features

●Operating voltage: 2.4V~5.2V

●Built-in 256kHz RC oscillator

●External 32.768kHz crystal or 256kHz frequency source input

●Selection of 1/2or1/3 bias, and selection of 1/2 or 1/3 or 1/4 duty LCD applications

●Internal time base frequency sources

●Two selectable buzzer frequencies (2kHz/4kHz)

●Power down command reduces power consumption

●Built-in time base generator and WDT

●Time base or WDT overflow output

●8 kinds of time base/WDT clock sources

●324 LCD driver

●Built-in 324 bit display RAM

●3-wire serial interface

●Internal LCD driving frequency source

●Software configuration feature

●Data mode and command mode instructions

●R/W address auto increment

●Three data accessing modes

●VLCD pin for adjusting LCD operating voltage

●HT1621: 44-pin QFP/LQFP package

●HT1621B: 48-pin SSOP/LQFP packages

●HT1621G: Gold bumped chip