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

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