Timeline for PCB layout for 16 MHz crystal oscillator
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
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| Jul 3 at 6:42 | comment | added | Lundin | @Justme It's not really related to signal speed as much as easier routing of QFP signals. Also it is kind of rare to see a board without a switch regulator these days and it's not easy to get a proper switch regulator design with just 2 layers. But yeah they really ought to move away from these old crap MCUs to ARM since there's about as few reasons to use 8-bitters as there is to use 2 layers. Writing C code for 8-bitters is kind of analogous to routing manual ground traces and using LDOs: crude, cumbersome, yesterday's technology. | |
| Jul 2 at 16:25 | comment | added | Andy aka | @hdaniu a 4 layer board is easier to lay out, has better EMI performance and costs only a little bit more than a 2 layer board. | |
| Jul 2 at 15:05 | comment | added | hdaniu | Thanks @Andyaka! I haven't worked with 4 layer pcb's but I'll give it a try! With this board I want to control 4 small motors with encoders and read 4 inductive sensors, so I want to use all 8 of the external interrupt pins. I also want to control the speen using the pwm pins. I don't think that it's too complicated of a task, but is it really worth trying a 4 layer design? | |
| Jul 2 at 13:46 | comment | added | Andy aka | @Justme I don't think you can possibly say that given that the OP hasn't disclosed the full details of the circuit board. He does say it's a board with an integrated MCU but he also hints at other things including motor drivers. So, this isn't a 4 layer board for a just measly 16 MHz MCU is it. | |
| Jul 2 at 13:29 | comment | added | Justme | Suggesting a 4 layer board for a measly 16 MHz MCU is a bit weird. If going for a 4 layer board, you might as well suggest to replace the 16 MHz 8-bit ATMega2560 with a 500 MHz 32-bit ARM MCU with megabyte of RAM and Flash and it would still be in fact cheaper. | |
| Jul 2 at 11:57 | comment | added | Lundin | +1 for the 4 layer advise, there's really no reason to use any 2 layer stackup for MCU boards these days, if there ever was one. | |
| Jul 2 at 11:55 | history | answered | Andy aka | CC BY-SA 4.0 |