HT1618

LED Driver

www.artschip.com

1

DESCRIPTION

TM1618 is an LED Controller driven ASIC. 1 segment/grid output lines, MCU digital interface, data latch, High-voltage LED driver,

key scan circuit dare all incorporated into a single chip to build a highly reliable peripheral device for a single chip microcomputer.

Housed in a 18-pin DIP Package, TM1618 pin assignments and application circuit are optimized for easy PCB Layout and cost

saving advantages.

FEATURES

CMOS Technology

Display Modes (5segment, 7 grid to 8segment, 4grid)

Key Scanning (5 x 1Bit)

8-Step Dimming Circuitry

Serial Interface (CLK, STB, DIN, DOUT)

Oscillatory Manners; RC Oscillation (450KHz ±5%)

Built-in on-reset circuit

Available in 18-pin, DIP Package

APPLICATION

Micro-computer Peripheral Device

VCR/VCD/DVD set

Combi set

PIN

CONFIGURATION:

TM1618

PIN DESCRIPTION

Pin Name

Description

Explanation

DIO

Data Input/Output

This pin inputs serial data at the rising edge of the shift clock (starting from

the lower bit)

This pin outputs serial data at the falling edge of the shift clock (starting from

the lower bit )

STB

Serial Interface

Strobe

This pin reads initialization serial data at the rising/falling edge of the shift

clock then wait for the command.

The data input after the STB has fallen is processed as a command. When

this pin is “HIGH”, CLK is ignored

CLK

Clock Input Pin

This pin reads serial data at the rising edge and outputs data at the falling

edge.

NC

NC

No Connect

K2

Key Data Input Pins

The data sent to these pins are latched at the end of the display cycle.

(Internal Pull-Low Resistor)

Seg1/KS1~Seg5/KS5

Output Segment

Segment Output Pins (p-channel, open drain) Also acts as the key source

Grid1 ~ Grid2

Grid Output Pins

Grid Output Pins (N-Channel, open drain)

Grid3~Grid4

Grid Output Pins

Grid Output Pins (N-Channel, open drain)

Seg12/Grid7~Seg14/Grid5

Output (Seg/Grid)

Seg/Grid Multiplexing output

Logic Power

5V±10%

Logic Ground

Connects the system ground