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Member's Forum 5 Renesas RX23E-B controllers
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  • Replies 39 replies
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  • RX23e-a
  • rx23E-B
  • renesas
  • d2a28d6e-11d8-11ee-be56-0242ac120002
Related

5 Renesas RX23E-B controllers

Jan Cumps
Jan Cumps over 1 year ago

What the title says . Good analogue front end, low noise, many bits ADC. None of that ARM rubish :)

image

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  • Jan Cumps
    Jan Cumps 11 months ago +3
    This is the scope that I've set for the PCB I'm designing. Based on Renesas' starter kit: green: part of my board blue: I offload to separate plug-in PCBs red: I don't use, and make the relevant…
  • Jan Cumps
    Jan Cumps over 1 year ago in reply to shabaz +2
    I got all bases covered :)
  • Jan Cumps
    Jan Cumps over 1 year ago in reply to Jan Cumps +2
    part 1 done. All primary pins assigned Digital and infra (clock, debug, reset, ...) left, analogue right. Power and ground top and bottom. Digital left, analogue right.
Parents
  • Jan Cumps
    Jan Cumps 11 months ago

    The clock part. I'm going very slow - daytime job is hectic at the moment

    image

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  • jc2048
    jc2048 11 months ago in reply to Jan Cumps

    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

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  • Jan Cumps
    Jan Cumps 11 months ago in reply to jc2048

    I used one of the Renesas reference designs: 

    image

    BOM

    image

    (schematic and BOM source Renesas website)

    The hardware manual (§9.3 and §9.5) contains the calculations, but I didn't use them.

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  • Jan Cumps
    Jan Cumps 11 months ago in reply to jc2048

    I used one of the Renesas reference designs: 

    image

    BOM

    image

    (schematic and BOM source Renesas website)

    The hardware manual (§9.3 and §9.5) contains the calculations, but I didn't use them.

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  • jc2048
    jc2048 11 months ago in reply to Jan Cumps

    How curious. It would still work (it would probably work without any load caps and just the pin capacitance), but it would be a bit skittish and the RTC isn't going to keep very good time.

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  • Jan Cumps
    Jan Cumps 11 months ago in reply to jc2048

    I will keep this in mind. I bought "a lot" of 1206 capacitors. I chose that size because they are easy to switch out.

    image

    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 ...

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