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XIO3130 unused pins issue

Vyacheslav Prokopiy
Expert 1305 points
Other Parts Discussed in Thread: XIO3130

Hello.

We're going to use XIO3130 in our device. And now we have a question about unused pins.

We are not going to use EEPROM on I2C bus.

So the questions are:

1. Can we leave SCL and SDA pins floating or we have to connect them to VCC or GND?

2. How must be unused and reserved pins (RSVD) connected: to ground, to VCC or leave them floating?

  • 0
    Guru 316780 points

    Section 3.4.1 of the Data Manual says:

    If no external EEPROM is required, the serial bus interface is permanently disabled by attaching a pulldown resistor to the SCL signal.

    It doesn't say anything about SDA, but to prevent the pin from floating, you should use a pullup (just as if there were an I²C bus).

    Table 2-11 says:

    A13, B12     These terminals must tied to VDD15.
    C04, P01     This terminal must be tied to GND.
    D04     Pullup to Vaux (if supported) or VDD3.3 (if not)