Features

• Operating voltage : 2.4V~5.2V

• Built-in 256kHz RC oscillator

• External 32.768kHz crystal or 256kHz frequency source input

• Selection of 1/2 or 1/3 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

• 32x4 LCD driver

• Built-in 32x4 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 LQFP package
  HT1621B: 48-pin SSOP/LQFP packages
  HT1621G: Gold bumped chip