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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