PCF8575: PCF8575

Ninaad Maitra

Prodigy 10 points

Part Number: PCF8575

In our products we use PCF8575PW, but due to unavailability am not able to find the part.

What is difference between PCF8575.PCF8575C,PCF8575D ?

Can you suggest PCF8575 replacement ?

over 2 years ago

+1 Clemens Ladisch over 2 years ago

Guru 244230 points

The difference between the PCF8575 and the PCF8575C is that the latter does not have the 100 µA pull-up at the I/Os.

The PCF8575D does not exist; the "D" is probably the first letter of the package name.

There are other 16-bit I/O expanders (with a different software interface), but the availability is just as bad. It might be possible to add an adapter for SSOP or SOIC packages.

0 Ninaad Maitra over 2 years ago in reply to Clemens Ladisch

Prodigy 10 points

PCF8575C are vailable with many vendors.

By adding PullUp resistors on I/O with PCF8575C will resolve my issue. or any other change is required ?

Beacause my current design has provision for I/O pullups.

0 Clemens Ladisch over 2 years ago in reply to Ninaad Maitra

Guru 244230 points

I do not know the exact requirements of your circuit. But in general, the internal pull-ups can be replaced with external ones.

0 Ninaad Maitra over 2 years ago in reply to Clemens Ladisch

Prodigy 10 points

I am using it as a general purpose I/O.

+1 Chris Ayoub over 2 years ago in reply to Ninaad Maitra

TI__Genius 15345 points

Hi Ninaad,

You are correct, all you would have to do is add external pull ups to the I/O pins. The benefit with the PCF8575C is that you can control how strong you want your pull up to be. The PCF8575 will always have an internal 100 uA pull up.

Best,

Chris

0 Ninaad Maitra over 2 years ago in reply to Chris Ayoub

Prodigy 10 points

Thanks for resolving my issue.

Interface

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PCF8575: PCF8575