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MC14489P bảng dữ liệu(PDF) 1 Page - Motorola, Inc |
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1 / 20 page MC14489 MOTOROLA 1 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 BitGrabber is a trademark of Motorola Inc. MICROWIRE is a trademark of National Semiconductor Corp. Order this document by MC14489/D MOTOROLA SEMICONDUCTOR TECHNICAL DATA PIN ASSIGNMENT MC14489 P SUFFIX PLASTIC DIP CASE 738 DW SUFFIX SOG PACKAGE CASE 751D ORDERING INFORMATION MC14489P Plastic DIP MC14489DW SOG Package b d VDD e f ENABLE BANK 1 Rx a c 5 4 3 2 1 10 9 8 7 6 14 15 16 17 18 19 20 11 12 13 BANK 4 BANK 5 DATA OUT h g CLOCK DATA IN BANK 2 VSS BANK 3 20 1 20 1 © Motorola, Inc. 1995 REV 3 10/95 |
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Mô tả tương tự - MC14489P |
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