HT1647(2000) 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT1647
(Rev.:2000)

4-Level Gray Scale 64
x16 LCD Controller for I/O μC

Holtek Semiconductor 

HT1647

4-Level Gray Scale 64´16 LCD Controller for I/O mC

Features

· Operating voltage: 2.7V~5.2V

· Built-in 32kHz RC oscillator

· External 32.768kHz crystal oscillator or

32kHz frequency source input

· Standby current < 1mA at 3V, < 2mA at 5V

· Internal resistor type: 1/5 bias or 1/4

bias, 1/16 duty

· Two selectable LCD frame frequencies:

89Hz or 170Hz

· Max. 64´16 patterns, 64 segments and 16

commons

· Built-in bit-map display RAM: 2048 bits

(=64´16´2 bits)

· Built-in internal resistor type bias generator

· Six-wire interface (four data wires)

· Eight kinds of time base/WDT selection

· Time base or WDT overflow output

· R/W address auto increment

Applications

· Toys

· Games

· Personal digital assistant

General Description

HT1647 is a peripheral device specially de-

signed for I/O type mC used to expand the dis-

play capability. The max. display segment of

the device are 1024 patterns (64 segments and

16 commons). It also supports four data bits in-

terface, buzzer sound, Watchdog Timer or time

base timer functions. The HT1647 is a memory

mapping and multi-function LCD controller.

Since the HT1647 can control ECB-type (Elec-

trically Controlled Birefringence) LCDs in ad-

dition to current TN-type (Twisted Nematic) or

STN-type (Super Twisted Nematic) LCDs, it

can support 4-color display as well as 4-level

· Built-in buzzer driver (2kHz/4kHz)

· Power down command reduces power

consumption

· Software configuration feature

· Data mode and Command mode

instructions

· Three data accessing modes

· Provides VLCD pin to adjust LCD operating

voltage

· Provides three kinds of bias current

programming

· Control of TN-type, STN-type LCDs and

ECB-type LCDs

· Four-level gray scale output for TN-type,

STN-type LCDs panel

· Four-color output for ECB-type LCDs panel

· Available in 100-pin QFP and in chip form

· Cellular phone

· Global positioning system

· Consumer electronics

gray scale display. It displays 4-level gray scale

output when HT1647 drives TN-type,

STN-type LCDs. It displays four color output

when HT1647 drives ECB-type. HT1647 uses

PWM (Pulse Width Modulation) technique. The

software configuration feature of the HT1647

make it suitable for multiple LCD applications

including LCD modules and display subsys-

tems. Only six lines (CS, WR, DB0~DB3) are

required for the interface between the host con-

troller and the HT1647. The HT164X series

have many kinds of products that match vari-

ous applications.

1

April 21, 2000

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