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MC14489

Motorola
Part Number MC14489
Manufacturer Motorola
Description Multi-Character LED Display/Lamp Driver
Published Aug 19, 2014
Detailed Description MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC14489/D Multi-Character LED Display/Lamp Driver CMOS T...
Datasheet PDF File MC14489 PDF File

MC14489
MC14489

Overview
MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC14489/D 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 synchronous 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 MICROWIRE™ 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 Elem...


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