MC14489BPE

NXP  MC14489BPE  发光二极管驱动器, 15输出, 共阴极, 4.5V-5.5V输入, 4MHz开关, 5.4V/17.5mA输出, DIP-20

The is a multi-character LED Display/Lamp 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 MC14489B features data retention plus decode and scan circuitry, thus relieving processor overhead. A single, current -setting resistor is the only ancillary component required. A special technique allows driving 5-1/2 digits. 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 MC14489B is compatible with the SPI and National MI-CRO-WIRETM serial data ports.

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Current sources controlled by single resistor provide anode drive

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Low-resistance FET switches provide direct common cathode interface

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Low-power mode extinguishes the LEDs and brightness controlled via serial port

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Special circuitry minimizes EMI when display is driven and eliminates EMI in low-power mode

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Power-on reset POR blanks the display on power-up, independent of supply ramp up time

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May be used with double-heterojunction LEDs for optimum efficiency