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      Hi Paul, Thanks for the suggestions. I have revised the design. Do you suggest any improvement?
      • top-bottom layers.png
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      Hi Andy, Thanks a lot! I now get your points.
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      Hi Andy, Thank you for your valuable insights. In this circuit we are also using DAC and Opamp, and to power them, we need +-9V supplies. From +9V, we are using linear regulator to get +5V to power the microcontroller. We also suspected the issue...
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      We are testing the DIY version, and find that the digital outputs encounter some oscillations. We tried digitalWrite(30, 0) on both standard and DIY versions, and the results are as follows. May it be caused by improper grounding? The PCB...
      • standard t41.png
      • custom DIY.png
      • Screenshot 2024-07-10 161833.png
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      bhaskar reacted to BillFM's post in the thread DIY Teensy 4.1 stuck at double blinking with Like Like.
      Hello. First time posting. The 24MHz crystal (according to the symbol shown) is not connected to XTALO correctly. Connections to GND and XTALO should be swapped (at top of crystal symbol). Don't forget to move the capacitor as well. The XTAL1...
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      bhaskar reacted to jmarsh's post in the thread DIY Teensy 4.1 stuck at double blinking with Like Like.
      You tried to upload a blink sketch for the Teensy2. Try the sketch for Teensy 4.1 (ends in 41).
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      If a 15 sec Restore works it should stay with RED LED on some long time then come back to blink showing the bootloader and the 1062 are in good shape together. >> Power, Press Button and hold ~15 secs until RED LED (bootloader LED) flashes and...
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      bhaskar reacted to jmarsh's post in the thread DIY Teensy 4.1 stuck at double blinking with Like Like.
      Was the MKL chip purchased brand new? Not taken from a different board?
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      Can you measure the VDD_SOC_IN voltage? If the last stage of the power up sequence is working, it should be 1.15V or 1.25V. Maybe also check the voltages on VDD_HIGH_CAP, NVCC_PLL, and VDD_SNVS_CAP. If the board truly has completed all stages...
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      Another thing to check, probably a long-shot, is whether you have anything driving the IMXRT1062 pins before it starts the power up sequence. Perhaps other devices that power up separately?
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      Does this mean the 1062 wasn't fuse configured and updated? Would the 15 Sec Restore complete this? @bhaskar was this tried?
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      Hi Paul, Many thanks for the reply. We fixed the issue by simple resoldering the MKL and W25 chips. Apart from that the oscillator connection was wrong. Now we can flash codes without any issue, and IO ports seem working fine. We will do more...
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      Hi everyone, Thanks for the valuable insights. The issue was perhaps improper soldering as I do not have much experience. I removed and resoldered both the MKL and W25Q64 chips, and it now works as expected! The main mistake in the design was...
      • Schematic_SCAN_CTRL_V2.0_R0_2024-06-21.png
      • DIY T41-2.png
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      Yes, both MKL chip and the MIMXRT chips were new, from PJRC. Maybe I would try to remake the board once more.
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      The verbose report shows the following: 17:53:52.435 (loader): Teensy Loader 1.58, begin program 17:53:52.480 (loader): File "C:\Users\PC\Downloads\blink_both\blink_both\blink_slow_Teensy41.hex", 14452 bytes 17:53:52.480 (loader): File...
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      Thank you for your reply. I also tried the file 'blink_slow_Teensy41.hex', but the issue is same. [After pressing the program button, the LED blinks 3 times while PC showing the chip] Is it possible that something is damaged? The issue is the...
      • t41.png
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      Thanks a lot for the help. After fixing the crystal connection it seems the errors are gone. However, I am still not able to upload any program. When I connect the board, the PC gives the sound. When trying to upload with the program button, the...
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      We are trying to build a custom teensy board. Currently we are experiencing the double blinking error, indicating JTAG not responding or improper power startup sequence. We have tried 3 PCBs, and the issue is same (perhaps the issue is with our...
      • schematics.png
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