Remote Control I/R TSOP4138 Help


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  1. #1
    Join Date
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    Default Remote Control I/R TSOP4138 Help

    Hi thank you for reading.

    I have the circuit as below....All software is working fine.

    However I am aware the IP Pin on my Processor (16F627A) is being spiked by mains EMI and causing issues. I know this and I can repeat it by jigging a light switch (Fridge and Oven Stat also do same). The circuit is battery powered by a 12v alarm battery then a LDO 5v Regulator. So no physical connection with mains.

    The 5v supply has decouplers on in and out as per data sheet.... Also there is a 100nf cap in the socket of the 16f627A.


    Any help in stopping my circuit getting spiked welcome.

    See attached AndyCad sketch for circuit.

    AndyName:  IMG_20200320_133855.jpg
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Size:  169.9 KBName:  IMG_20200320_133855.jpg
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  2. #2
    Join Date
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    Default Re: Remote Control I/R TSOP4138 Help

    Andy, I would place a 10uF ceramic cap across the processor after the 100 Ohm resistor. I would also replace the 100 Ohm with a 10 Ohm. I have to ask what are you doing with the remaining pins on the processor? Also, what other circuits are you powering from the LDO? I am assuming the regulator is somewhere on the left of the schematic?
    Last edited by Dave; - 20th March 2020 at 14:42.
    Dave Purola,
    N8NTA
    EN82fn

  3. #3
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    Default Re: Remote Control I/R TSOP4138 Help

    A Little bit more :-

    The unused pins are set as outputs Using TRISA=00000000 and TRISB=00010000 (RB3 is the i/p for the InfraRed)

    Only other cct is a clock DS1307 on RB1 and RB2 (SDA and SCL)

    LDO is LM2931

    Andy

  4. #4
    Join Date
    Mar 2003
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    Default Re: Remote Control I/R TSOP4138 Help

    Andy, What do you mean by " is being spiked by mains EMI and causing issues."? Please explain... What is it doing wrong?
    Dave Purola,
    N8NTA
    EN82fn

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