What the title says . Good analogue front end, low noise, many bits ADC. None of that ARM rubish :)
What the title says . Good analogue front end, low noise, many bits ADC. None of that ARM rubish :)
Where did the load caps come from? They look low in value to me.
If the 32.768kHz xtal is cut for 3.7pF, then assuming a pin/track value of something like 1.5pF (if you keep it compact and close to the pins), 5.6pF might work better. (5.6pF+1.5pF)/2 = 3.55pF
I used one of the Renesas reference designs:
BOM
(schematic and BOM source Renesas website)
The hardware manual (§9.3 and §9.5) contains the calculations, but I didn't use them.
I will keep this in mind. I bought "a lot" of 1206 capacitors. I chose that size because they are easy to switch out.
I ordered enough to cover the "not bulk capacitance" spectrum. And then some ...
1p - 8.2p
10p -82p
100p - 820p
1n - 8.2n
10n - 82n
100n - 22µ
If I manage to get the board designed (daytime job creeps into the nighttime at the moment), I can learn some more about properly designing the clock circuit ...