3 ms·
He explains all his decisions for PCB design (https://lcamtuf.substack.com/p/designing-your-own-pcbs https://lcamtuf.substack.com/p/designing-your-own-pcbs) and
by dekhn 3y ago
He explains all his decisions for PCB design (https://lcamtuf.substack.com/p/designing-your-own-pcbs https://lcamtuf.substack.com/p/designing-your-own-pcbs) and note this is a small-run device mainly intended for pedagogical reasons.
Also the device worked even when it was on a breadboard, suggesting he made reasonable technical decisions regarding placebo capacitors.
- dragontamer 3y agoAVR DB is a 24MHz computer though. This other post (https://lcamtuf.substack.com/p/mcu-land-part-3-baby-steps-with-cortex https://lcamtuf.substack.com/p/mcu-land-part-3-baby-steps-wi...) has more information with his experiments with SAMS70, suggesting experimentation with a breakout board. So same same overall but... He's upgraded to the SAMS70 which is 300MHz. Its a totally different class of processor. > Also the device worked even when it was on a breadboard, suggesting he made reasonable technical decisions regarding placebo capacitors. I dunno. PDN (power-delivery network) issues are really complex. You solve a lot of headaches with a 1-penny 100nF capacitor here and there. I'm very curious what the SAMS70's onboard capacitance is. I'm wondering if Microchip/Atmel goes overboard on onboard capacitance or something. In any case: the documentation from Microchip is clear about this. 100nF capacitors on every input pin. I don't see any reason to stray from this, its not like 100nF capacitors are expensive, or even difficult to solder.