I am thinking about using the SC18IM700 for RS-232 to I2C conversion. My question is about the RX and TX pins on this chip. Are these real RS-232 signals that go from -5V to +5V or are they TTL serial signals that only go from 0V to +5V? I could not find any information about this on the data sheet.
Also, if they do go from -5V to +5V, are these values generated internally from the 2.3V-3.6V power supply used to operate the chip?