HT1621

RAM Mapping 32´4 LCD Controller for I/O mC

Selection Table

HT162X

HT1620 HT1621 HT1622 HT16220 HT1623 HT1625 HT1626 HT1627 HT16270

COM

4

4

888

8

16

16

16

SEG

32

32

32

32

48

64

48

64

64

Built-in Osc.

Ö

Ö

ÖÖÖÖ

Crystal Osc.

Ö

Ö

Ö

ÖÖÖ

Ö

1

April 21, 2000

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

General Description

The HT1621 is a 128 pattern (32´4), memory

mapping, and multi-function LCD driver. The

S/W configuration feature of the HT1621

makes it suitable for multiple LCD applica-

tions 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.