Part Number: PCF8575
Dear TI Support,
I am evaluating a drop‑in replacement for the PCA9671D,118 in a 7.7 mm‑wide package, and I would prefer not to respin the PCB.
In the existing design, pin 1 (INT) is not used (it is mechanically removed), and the GPIO pins are continuously read. I tested the PCF8575DWR as a replacement, but it is failing during system testing.
The PCA9671 datasheet states that:
“The number of data bytes that can be sent successively is not limited. After every two bytes, the previous data is overwritten. Similarly, data can be read in a constant stream.”
Can you confirm whether this same behavior is supported by the PCF8575? Specifically, does the PCF8575 allow unlimited successive read or write data bytes with the internal port state being updated every two bytes, or does it require fixed‑length (two‑byte) transactions?
Thank you for your help and support.
Best regards,
Jeff Cohen
