hi, I've got one question relative to the article "Using the I2C driver to access a HD44780 LCD" (http://www.acmesystems.it/?id=162). The schematic seems don't care about different logic levels between the fox board (3.3V) and Philips PCF8574 (5.0V). I know that Fox's inputs are 5V tollerant so no damage will happen, but I have some doubt regarding the ability of the PCF8574 to regognize output levels coming from the FOX (i.e. the I2C clock signal). The PCF8574 datasheet says that minimun level for the High signal must be 0.7*Vdd (so 0.7*5=3.5V) but the FOX board can generate that level. Ho can it work ?
Thanks to everyone for the answers Maurizio [Non-text portions of this message have been removed]
