LED Driver IC

DESCRIPTION

HT1668 is an LED Controller driven on a 1/7to 1/8 duty factor. Eleven segment output lines, six grid output lines, 1

segment/grid output lines, one display memory, control circuit , key scan circuit are all incorporated into a single chip to build a

highly reliable peripheral device for a single chip microcomputer. Serial data is fed to HT1668 via a four-line serial interface.

Housed in a 24-pin SO Package, HT1668 pin assignments and application circuit are optimized for easy PCB Layout and cost

saving advantages.

FEATURES

CMOS Technology

Low Power Consumption

Multiple Display Modes

Key Scanning

8-Step Dimming Circuitry

Serial Interface for Clock, Data Input, Data Output, Strobe Pins

Available in 24-Pin, SOP Package

APPLICATION

Micro-computer Peripheral Device

VCR set

Combi set

BLOCK DIAGRAM

SEGMENT DRIVER/

KEY SCAN OUTPUT/

GRID DRIVER

Control

Dispaly Memory

Timing Generator

Key Matrix

Memory

Dimming Circuit

Serial

Data

Interface

OSC

DI/O

CLK

STB

K1

K2

VDD GND

GR1

GR2

GR3

GR4

SG14/GR5

SG13/GR6

SG12/GR7

SG10/KS10

SG9/KS9

SG8/KS8

SG7/KS7

SG6/KS6

SG5/KS5

SG4/KS4

SG3/KS3

SG2/KS2

SG1/KS1

HT1668

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