HT1621

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HT1621

RAM Mapping 32x4 LCD Controller for I/O MCU

Features

Operating voltage: 2.4V ~ 5.2V

Built-in 256kHz RC oscillator

External 32.768kHz crystal or 256 kHz 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 a 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

HT1621B: 48-pin SSOP/LQFP packages

HT1621D: 28-pin SKDIP package

HT1621G: Gold bumped chip

General Description

The HT1621 is a 128 pattern (32x4), 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 interface between the host controller and the HT1621. The HT1621 contains a power down command to reduce power

consumption.

Selection Table

HT162X

HT1620

HT1621

HT1622

HT16220

HT1623

HT1625

HT1626

COM

4

4

8

8

8

8

16

SEG

32

32

32

32

48

64

48

Built-in Osc.

—

√

√

—

√

√

√

Crystal Osc.

√

√

—

√

√

√

√