MC14489BDWE

The MC14489BDWE is a multi-character LED Display/Lamp Driver which directly interfaces to individual lamps, 7-segment displays/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 14489B 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. 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. It is compatible with the NXP SPI & National MI-CRO-WIRETM serial data ports.

• 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 of 4300 elements (FETs, resistors, capacitors)

Applications

Computers & Computer Peripherals, Automation & Process Control, Embedded Design & Development, Communications & Networking