PCF8575 - 16 Bit I/O Port Expander - Driver implementation

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Re: PCF8575 - 16 Bit I/O Port Expander - Driver implementati

By piersfinlayson
- Thu Sep 29, 2016 8:48 am #55861 Very good :D . I wish I'd seen that other article before I submitted my recent boards to the fab house :lol: .
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Re: PCF8575 - 16 Bit I/O Port Expander - Driver implementati

By piersfinlayson
- Thu Sep 29, 2016 8:49 am #55862
trackerj wrote:In the related article from above is provided the proper Datasheet link directly from NXP. So yes, it is NXP one. Basically they are the same thing.


Meant to say - different addresses between NXP and TI which can catch people out.
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Re: PCF8575 - 16 Bit I/O Port Expander - Driver implementati

By piersfinlayson
- Thu Sep 29, 2016 10:29 am #55868
martinayotte wrote:What do you mean ?
Both TI and NXP have their PCF8574 address been the same at 0x40 ...


I'm confusing the PCF8574 and PCF8574A - which do have different addresses from each other (but as you say are common between the NXP and TI).

However, neither have an address at 0x40. The PCF8574 base address is 0x20 and the PCF8574A base address is 0x38.

(I assume you mean 0x40 including a r/w bit set to 0, but 0x41 with the bit set to 1.)
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