Learning Outcomes

This chapter will help you to:

6-1 Convert decimal numbers to BCD code and BCD to decimal.

6-2 Identify the characteristics and applications of several commonly used codes.

6-3 Compare decimal numbers with excess-3 code, Gray code, and 842l BCD code.

6-4 Interpret the operation of a 4-bit Gray code shaft encoder using optical encoding. Understand the use of a 2-bit quadrature encoder in determining direction of shaft rotation.

6-5 Convert ASCII code to letters and numbers, and convert characters to ASCII code.

6-6 Demonstrate detailed understanding of an encoder (74147 decimal-to-BCD encoder lC). Interpret operational details from truth tables, pin-outs, and logic diagrams (74147 encoder IC).

6-7 Describe the construction of several light-emitting diode (LED) displays. Test the operation of a seven-segment LED.

6-8 Demonstrate understanding of typical decoders including a BCD-to-seven-segment decoder/driver.

6-9 Interpret operational details from truth tables, pin-outs, and logic diagrams (7447 BCD-to-seven-segment decoder/driver IC). Wire a 7447 decoder/driver to a common-anode seven-segment LED display.

6-10 Describe the construction and operation of a liquid-crystal display (LCD). Identify operational details of a CMOS decoder/driver system used to drive an LCD. Demonstrate understanding of color LCDs by answering selected questions.

6-11 Interpret operational details from truth table, pin-outs, and logic diagrams (74HC4543 BCD-to-seven-segment latch/decoder/driver IC for driving an LCD). Explain the functioning of the CMOS decoder/latch/driver IC interfaced with a LCD.

6-12 Describe the construction and operation of a vacuum fluorescent (VF) display.

6-13 Interpret operational details from truth table, pin outs, and logic diagrams (CMOS 4511 BCD-to-seven-segment latch/decoder/driver IC). Explain the functioning of the CMOS latch/decoder/driver IC interfaced with a VF display.

6-14 Troubleshoot two faulty decoder/driver seven-segment display circuits.