• on Miscellaneous Electronics
  • Published in issue 3/2003 on page 0
About the article

SAA3049 Replacement

a microcontroller-based RC5 decoder

SAA3049 Replacement
Sadly enough, the popular Philips SAA3049 remote control decoder IC is no longer available. No semiconductor foundry offers a replacement type, probably because nowadays remote-control decoding in consumer electronics is performed by customer-specific microcontrollers. We can do the same ourselves!The number of ICs that have been specifically developed for decoding infrared messages is significantly less that the number of available transmitter ICs. This is because there is often already a microprocessor in the receiving device, and it can handle the decoding ‘on the side‘. Depending on the application, a certain amount of supplementary logic is always necessary to integrate a decoder IC into a circuit, and this contributes to cost and space problems. Modern microcontrollers can handle this task just as well or better, and they only cost around 50 pence each in large quantities.
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Products
Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Resistors:
R1,R2,R9 = 1k?
R3-R8 = 820?
R10 = 100?
Capacitors:
C1,C3,C5 = 100nF
C2,C4 = 100µF 16V radial
Semiconductors:
D1-D6 = LED, red, low current
IC1 = 87LPC764BN, programmed, order code 020085-41
IC2 = 7805
IC3 = IR receiver module SFH5510, PIC2604SM, TFM5360 or similar
IC4-IC11 = 74HC595
Miscellaneous:
JP1 = jumper
S1 = 8-way DIP switch
PCB, order code 020085-1
Disk, source and HEX code, order code 020085-11 or Free Download
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