MC14489 Datasheet, PDF (1/20 Pages) Motorola, Inc – Multi-Character LED Display/Lamp Driver

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
©_MOMo_Tto_Oro_Rla,_OIn_Lc._A1995
MC14489
1