Keeping the Unused Pins in EZ-USB® HX2VL™ – KBA89012

Version 1
    Version: **

     

    Question: How do you keep the unused pins in HX2VL?

     

    Answer:

    Please check Figure 1 for unused pins in HX2VL and their configuration if not used.

    Figure 1. Unused Pins in HX2VL

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
        Pin Name    LQFP
        48
        QFN 28    Pin configuration if not used
        SEL48/SEL27    25/24         Floating, default 12-MHz crystal or
        OSC in
        SELFPWR    37    22    Must be pull high (self power mode) or
        low (bus power mode)
        GANG    39    23    Must be pull high (Gang mode) or low
        (Individual mode)
        Test
        I2C_SCL
        27    18    Floating, default normal operation
        AMBER[1]
        SPI_CS
        46         Floating
        GREEN[1]
        SPI_SK
        FIXED_PORT1
        45         Floating, default removable port due
        to internal pull down
        OVR#[1]    42    25    Floating, no over-current condition
        detection due to internal pull up
        PWR#[1]
        I2C_SDA
        43    26    Floating
        AMBER[2]
        SPI_DI
        PWR_PIN_POL
        36         Floating, default power switch enable
        pin polarity is low due to internal pull
        down
        GREEN[2]
        SPI_DO
        FIXED_PORT2
        35         Floating, default removable port due
        to internal pull down
        OVR#[2]    40    24    Floating, no over-current condition
        detection due to internal pull up
        PWR#[2]    41         Floating
        AMBER[3]
        SET_PORT_NUM2
        33         Floating, port number is only decided
        by AMBER[4]/SET_PORT_NUM1
        GREEN[3]
        FIXED_PORT3
        32         Floating, default removable port due
        to internal pull down
        OVR#[3]    30    20    Floating, no over-current condition
        detection due to internal pull up
        PWR#[3]    31         Floating
        AMBER[4]
        SET_PORT_NUM1
        33         Floating, port number is only decided
        by AMBER[3]/SET_PORT_NUM2
        GREEN[4]
        FIXED_PORT4
        32         Floating, default removable port due
        to internal pull down
        OVR#[4]    28    19    Floating, no over-current condition
        detection due to internal pull up
        PWR#[4]    29         Floating
        D+/D-              unused ports D+/D- should be floating