The TUSB4020BI is a two-port USB 2.0
hub. It provides USB high-speed/full-speed connections on the upstream port and provides
high-speed, full-speed, or low-speed connections on the two downstream ports. When the upstream
port is connected to an electrical environment that supports high-speed and full-speed/low-speed
connections, high-speed and full-speed/low-speed USB connectivity is enabled on the downstream
ports. When the upstream port is connected to an electrical environment that only supports
full-speed/low-speed connections, high-speed connectivity are disabled on the downstream
supports per port or ganged power switching and overcurrent protection.
An individually port power controlled hub switches power on or off to each downstream
port as requested by the USB host. Also when an individually port power controlled hub senses an
over-current event, only power to the affected downstream port will be switched off.
A ganged hub switches on power to all its downstream ports when power is required to be
on for any port. The power to the downstream ports is not switched off unless all ports are in a
state that allows power to be removed. Also when a ganged hub senses an overcurrent event, power to
all downstream ports will be switched off.
The TUSB4020BI downstream ports provide support for battery
charging applications by providing battery charging connected downstream port (CDP) handshaking
support. It also supports a dedicated charging port (DCP) mode when the upstream port is not
connected. The DCP mode supports USB devices which support the USB Battery Charging and the Chinese
Telecommunications Industry Standard YD/T 1591-2009. In addition, an automatic mode provides
transparent support for BC devices and devices supporting Divider Mode charging solutions when the
upstream port is unconnected.
provides terminal strap configuration for some features including battery charging support, and
also provides customization though OTP ROM, I2C EEPROM or through an
I2C/SMBus slave interface for PID, VID, and custom port and phy
configurations. Custom string support is also available when using an
I2C EEPROM or the I2C/SMBus slave
The device is available in a 48-pin HTQFP package and is offered in an
industrial version for operation over the temperature range of –40°C to 85°C.
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