Hello,
We have been experiencing some failures with the PCF8574. The chip is used in 9 places throughout our design, but fails in one spot in particular. The chip will fail in 1 out 30 boards, usually on the first power up during testing. Recently, the failures have gone up.
The chip stops comminucating over I2C. Replacing the chip fixes the problem, but we have encountered a handful of boards that have needed a second replacement later during assembly.
This is a production application and I would appreciate a private discussion where I can post schematics and go into detail concerning our application.
Thank You,
Noah