MC14489 查看數據表（PDF） - Motorola => Freescale

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MC14489

Multi-Character LED Display/Lamp Driver

Motorola => Freescale 

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

Multi-Character

LED Display/Lamp Driver

CMOS

The MC14489 is a flexible light–emitting–diode driver which directly

interfaces to individual lamps, 7–segment displays, or various combinations of

both. LEDs wired with common cathodes are driven in a multiplexed–by–5

fashion. Communication with an MCU/MPU is established through a synchro-

nous serial port. The MC14489 features data retention plus decode and scan

circuitry, thus relieving processor overhead. A single, current–setting resistor is

the only ancillary component required.

A single device can drive any one of the following: a 5–digit display plus

decimals, a 4–1/2–digit display plus decimals and sign, or 25 lamps. A special

technique allows driving 5 1/2 digits; see Figure 16. A configuration register

allows the drive capability to be partitioned off to suit many additional

applications. The on–chip decoder outputs 7–segment–format numerals 0 to 9,

hexadecimal characters A to F, plus 15 letters and symbols.

The MC14489 is compatible with the Motorola SPI and National MICRO-

WIRE™ serial data ports. The chip’s patented BitGrabber™ registers augment

the serial interface by allowing random access without steering or address bits.

A 24–bit transfer updates the display register. Changing the configuration

register requires an 8–bit transfer.

• Operating Voltage Range of Drive Circuitry: 4.5 to 6 V

• Operating Junction Temperature Range: – 40° to 130°C

• Current Sources Controlled by Single Resistor Provide Anode Drive

• Low–Resistance FET Switches Provide Direct Common Cathode Interface

• Low–Power Mode (Extinguishes the LEDs) and Brightness Controlled via

Serial Port

• Special Circuitry Minimizes EMI when Display is Driven and Eliminates

EMI in Low–Power Mode

• Power–On Reset (POR) Blanks the Display on Power–Up, Independent of

Supply Ramp Up Time

• May Be Used with Double–Heterojunction LEDs for Optimum Efficiency

• Chip Complexity: 4300 Elements (FETs, Resistors, Capacitors, etc.)

• See Application Note AN431, Temperature Measurement and Display

Using the MC68HC05B4 and the MC14489 and Engineering Bulletin

EB153, Driving a Seven–Segment Display with the NEURON® CHIP

Order this document

by MC14489/D

MC14489

P SUFFIX

PLASTIC DIP

CASE 738

20

1

20

1

DW SUFFIX

SOG PACKAGE

CASE 751D

ORDERING INFORMATION

MC14489P Plastic DIP

MC14489DW SOG Package

PIN ASSIGNMENT

f1

e2

VDD 3

d4

c5

b6

a7

Rx 8

BANK 1 9

ENABLE 10

20 g

19 h

18 DATA OUT

17 BANK 5

16 BANK 4

15 BANK 3

14 VSS

13 BANK 2

12 DATA IN

11 CLOCK

BitGrabber is a trademark of Motorola Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

REV 3

10/95

©MOMoTtoOroRla,OInLc.A1995

MC14489

1

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