Once-over before sending off the PCB ?

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eez-open
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Re: Once-over before sending off the PCB ?

Postby eez-open » Thu Jan 25, 2018 9:01 am

Sorry for misunderstanding about reset. C44 should be fine. If necessary you can increase it to 47 or 100 nF.
You can change default layers color. There is not a lots of choice but still you can manage to set something that is easier to follow. Select Display option, and use Change on layer that is selected.
SpacedCowboy
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Postby SpacedCowboy » Thu Jan 25, 2018 7:10 pm

Sorry for misunderstanding about reset. C44 should be fine. If necessary you can increase it to 47 or 100 nF.


And this is where my understanding breaks down :( I don't see how a capacitor that's not connected to a supply voltage can keep /MR high ?

[sigh] So I really ought to read the datasheet - "Driving the manual reset pin (MR) low asserts RESET. MR is internally tied to VDD by a 90- kΩ pull-up resistor."

You can change default layers color. There is not a lots of choice but still you can manage to set something that is easier to follow. Select Display option, and use Change on layer that is selected.


Excellent, thank you :) That's good to know - I really ought to have looked! :)

Cheers
Simon
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eez-open
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Postby eez-open » Thu Jan 25, 2018 10:43 pm

SpacedCowboy wrote:
Sorry for misunderstanding about reset. C44 should be fine. If necessary you can increase it to 47 or 100 nF.


And this is where my understanding breaks down :( I don't see how a capacitor that's not connected to a supply voltage can keep /MR high ?

[sigh] So I really ought to read the datasheet - "Driving the manual reset pin (MR) low asserts RESET. MR is internally tied to VDD by a 90- kΩ pull-up resistor."


Capacitor is here not to keep MR high but to filter possible noise. Pull-up is inside as you found.

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