The ICM7218 series of universal LED driver systems

provide, in a single package, all the circuitry necessary to

interface most common microprocessors or digital systems

to an LED display. Included on chip are an 8-byte static

display memory, two types of 7-segment decoders, multiplex

scan circuitry, and high current digit and segment drivers for

either common-cathode or common-anode displays.

The lCM7218A and 1CM7218B feature two control lines

(WRITE and MODE) which write either 4 bits of control

information (DATA COMING, SHUTDOWN, DECODE, and

HEXA/CODE B) or 8 bits of display input data. Display data

is automatically sequenced into the 8-byte internal memory

on successive positive going WRITE pulses. Data may be

displayed either directly or decoded in Hexadecimal or Code

B formats.

The ICM7218C and lCM7218D feature two control lines

(WRITE and HEXA/CODE B/SHUTDOWN), 4 separate

display data input lines, and 3 digit address lines. Display

data is written into the internal memory by setting up a digit

address and strobing the WRITE line low. Only Hexadecimal

and Code B formats are available for display outputs.

特性 Features

? Microprocessor Compatible

? Total Circuit Integration On Chip Includes:

- Digit and Segment Drivers

- All Multiplex Scan Circuitry

- 8-Byte Static Display Memory

- 7-Segment Hexadecimal and Code B Decoders

? Output Drive Suitable for LED Displays Directly

? Common Anode and Common Cathode Versions

? Single 5V Supply Required

? Data Retention to 2V Supply

? Shutdown Feature - Turns Off Display and Puts Chip Into

Low Power Dissipation Mode

? Sequential and Random Access Versions

? Decimal Point Drive On Each Digit