I destroyed two I/O pins doing so... Geert Vancompernolle a écrit :
>Hi, > >I read in the documentation that all pins on the two 40 pin connectors >are 5V tolerant. > >I'm currently using the I2C pins of the connector and they're >connected to two series resistors of 100 Ohm (one for clock, one for >data), which are connected to a PCF8574 device. > >The PCF8574 device is powered with +5V (also coming from the 40 pin >connector). The signal levels of the I2C bus are 3.3V at the I2C >inputs of the PCF8574. I know this is sufficient, but I would like to >use a pull-up resistor of 5k6 to +5V for both SDA and SCL to increase >the level to +5V. Like this: > > +5V > | > _ > | | > |_| > | ___ >SDA-FOX ------|___|----> SDA-PCF8574 > >Same for SCL. > >Is this allowed? Will I not harm the I/O ports of the FoxBoard? > >Best rgds, > >--Geert > > > >
