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Standalone Clock

Discussion in 'General Electronics Discussion' started by hahahi, Apr 8, 2016.

  1. hahahi

    hahahi

    2
    0
    Apr 8, 2016
    Hi,

    I use an Arduino Uno to drive a TLC5940 with the hw clock output (16 MHz) enabled via the fuse register and want to switch to a Pro Micro which features HID. Problem is, the ATmega32u4 clock pin isn't exposed on this board.
    What's a reliable way to provide extra clock input for the TLC5940 that doesn't cost more than getting another MCU?
     
  2. AnalogKid

    AnalogKid

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    Jun 10, 2015
    Links to the components you are considering would help.

    ak
     
  3. hahahi

    hahahi

    2
    0
    Apr 8, 2016
    Links... so discrete components won't probably do. I've seen mentioned a CMOS inverter with a 74C04, but you can get a '328 cheaper. Pierce oscillator would be simpler, but would it suffice for a TLC5940?
    I have a dead mouse lying around. Assuming my soldering skills would be good enough to extract its nRF24LE1, it has a clock driver. What's the typical impedance/voltage on these MCU clock inputs with internal drivers? Could you tap it to drive the TLC5940?
     
  4. hevans1944

    hevans1944 Hop - AC8NS

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    Jun 21, 2012
  5. ankit guhe

    ankit guhe

    2
    0
    Apr 8, 2016
    All you need to do is burn the XYZ -Hz bootloader. This will set the correct fuses and code that is meant for that processor will run correctly. If you have an Uno, you will also need to modify the board.
     
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