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Pin7 Breakout for PCF8523 on SD Shield
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Pin7 Breakout for PCF8523 on SD Shield

by fsonnichsen on Thu Jan 10, 2019 2:41 pm

I need to read the PCF8523 interrupt pin (7) on the SD datalogging shield. I do not see this pin mapped to a header in the layout. Short of a fly-wire is this pin available somewhere on the board?

Thanks
Fritz

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Re: Pin7 Breakout for PCF8523 on SD Shield

by millercommamatt on Thu Jan 10, 2019 3:47 pm

If I'm reading the schematic (https://learn.adafruit.com/assets/66497) correctly, there's a through hole in the middle of the board that should be what you want. It's labeled SQ. It's between holes labeled 3V and WP.

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Re: Pin7 Breakout for PCF8523 on SD Shield

by fsonnichsen on Thu Jan 10, 2019 4:17 pm

aha-thanks. Now I see it. It is labled CN1 in the schematic (but not labeled on the board). I ohmed it out and you are correct.

cheers
fritz

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Re: Pin7 Breakout for PCF8523 on SD Shield

by adafruit_support_carter on Thu Jan 10, 2019 8:44 pm

Yep. That pin is multifunctional (see datasheet). The silk references the square wave output, CLKOUT. But it's a straight connection to Pin 7 of the PCF so is also INT1:
pcf.jpg
pcf.jpg (58.2 KiB) Viewed 39 times

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