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Standalone Clock

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

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  1. hahahi


    Apr 8, 2016

    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


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

  3. hahahi


    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

    Jun 21, 2012
  5. ankit guhe

    ankit guhe

    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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