The datasheet is here:
https://www.electro-tech-online.com/custompdfs/2012/08/PCF8574.pdf
In general, can the chip run at Vss = 5V and the I2C bus SDA and SCL be pulled up to 3.3 V
The processor runs at 3.3 V with 5V tolerant inputs (with a series resistor for other inputs) processor.
What about the interrupt line. I should be able to do one of two things, right:
1) Series resistor
2) 5V to 3.3 logic translator and a 3.3 to 5V translator
My initial playing will be without this chip using two interrupts and some I/O ports directly using level translators. The processor will be this one: https://www.coridiumcorp.com/SuperPRO.php Which is an ARM Cortex M3 @ 100 MHz - LPC1756
Just getting into this new fangled stuff.
https://www.electro-tech-online.com/custompdfs/2012/08/PCF8574.pdf
In general, can the chip run at Vss = 5V and the I2C bus SDA and SCL be pulled up to 3.3 V
The processor runs at 3.3 V with 5V tolerant inputs (with a series resistor for other inputs) processor.
What about the interrupt line. I should be able to do one of two things, right:
1) Series resistor
2) 5V to 3.3 logic translator and a 3.3 to 5V translator
My initial playing will be without this chip using two interrupts and some I/O ports directly using level translators. The processor will be this one: https://www.coridiumcorp.com/SuperPRO.php Which is an ARM Cortex M3 @ 100 MHz - LPC1756
Just getting into this new fangled stuff.