General Description：

The HT1621 is a 128 pattern (32×4), memory mapping, and multi-function LCD driver. The S/Wconfiguration feature of the HT1621 makes it suitable for multiple LCD applications including LCDmodules and display subsystems. Only three or four lines are required for the interface between thehost controller and the HT1621. The HT1621 contains a power down command to reduce powerconsumption.

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

• 32×4 LCD driver

• Built-in 32×4 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 packageHT1621B: 48-pin SSOP/LQFP packagesHT1621G: Gold bumped chip