Other NXP Products中的主题 Re: PCF8574

PCF8574

GEF68 — Thu, 09 Mar 2023 17:47:13 GMT

Hello,

I got confused with the component's datasheet

For I/Os; P0 to P7 it mentioned: OH HIGH-level output current VOH = VSS 30uA_min - 300uA max

Does it mean the device can operate in this range or ranges for devices can vary between 30uA to 300uA?

Thank you!

diazmarin09 — Thu, 09 Mar 2023 20:40:18 GMT

Hello,

I hope all is great with you. Thank you for using the NXP communities.

If the port is configured as output (high), this is the potential of the device. I mean, it can source up to 300uA.

I hope this information helps.

Regards,

David

GEF68 — Fri, 17 Mar 2023 11:46:12 GMT

Thank you so much for clarifying the issue!

GEF68 — Tue, 28 Mar 2023 01:12:58 GMT

Hello,

Thank you so much for assisting with this component.

One more question: What is very initial condition (states) of I/O P0-P7?

Sincerely,

Gadi Fishel

GEF68 — Tue, 28 Mar 2023 13:00:12 GMT

Greetings,

One more question regarding the component performance. Per spec

IIHL(max) - maximum allowed input through protection diode - =/- 400uA

and IOH = between 30uA up to 300uA

My question is it possible to make all 8 outputs of PCF8574 in HIGH with output current 200uA per channel?

diazmarin09 — Tue, 28 Mar 2023 23:00:10 GMT

Hello,

I am pleased to contact you again.

By default, the I/O pins are configured as input pins.

I hope this information helps.

Regards,

David