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MC14489B

Part Number	MC14489B
Manufacturer	Motorola
Description	Multy-Character LED Display/Lamp Driver
Published	Nov 21, 2011
Detailed Description	www.DataSheet.co.kr MOTOROLA SEMICONDUCTOR TECHNICAL DATA M u Iti-Character lED CMOS The MC144898 is a flexible light-...
Datasheet	MC14489B PDF File

Overview

www.
DataSheet.
co.
kr MOTOROLA SEMICONDUCTOR TECHNICAL DATA M u Iti-Character lED CMOS The MC144898 is a flexible light-emitting-diode driver which directly interfaces to individual lamps, 7-segment displays, or various combinations of both.
LEOs wired with common cathodes are driven in a multiplexed-by-5 fashion.
Communication with an MCUIMPU is established through a synchronous serial port.
The MC 144898 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 anyone of the following: a 5-digit display plus decimals, a 4-112-digit display plus decimals and sign, or 25 lamps.
A special technique allows driving 5 112 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 O to 9, hexadecimal characters A to F, plus 151etters and symbols.
The MC144898 is compatible with the Motorola SPI and National MICRO-WIRETM serial data ports.
The chip's patented 8itGrabberTM 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 5.
5 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, et...

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