Maximum current for IO pins?

[Candid-Moe]

What is the maximum current per user IO pins? What is the maximum current total for the user ports?

[Zeal8bit]

Hello @Candid-Moe ,

If you mean on Zeal 8-bit Computer, the user I/O pins are provided by the Zilog PIO. The datasheet seems to state that the maximum current is 100mAh, it's not very clear.

[Candid-Moe]

I've been searching and the only data I found says that the max. output current in Port B pins is 1.5 mA at 2.4 V, but not data for the Port A.
I understand that 100 mA is the max input current for the whole chip.
It don't feel safe to connect the Port A pin to anything ...
What is your experience? Did you have some practical limits?

[Zeal8bit]

Hello @Candid-Moe ,
I saw that 1.5mAh but wasn't sure, it sounded very low... I only used the PIO pins for signals, so I didn't draw any amp on these lines. If you really need to use any for controlling power, attach a transistor it, it's the safest and easiest solution

What are you trying to achieve?

[Candid-Moe]

I just want to thinker with hardware.

[Zeal8bit]

@Candid-Moe Then as long as you use the port A and port B for signals, you won't have any problem. For providing power, or higher current, add a transistor (mosfet or BJT)