Texas Instruments TUSB8042RGCT

The TUSB8042 is a four-port USB 3.1 Gen1 hub. It provides simultaneousSuperSpeed USB and high-speed/full-speed connections on the upstream port and provides SuperSpeedUSB, high-speed, full-speed, or low-speed connections on the downstream ports. When the upstreamport is connected to an electrical environment that only supports high-speed orfull-speed/low-speed connections, SuperSpeed USB connectivity is disabled on the downstream ports.

When the upstream port is connected to an electrical environment that only supportsfull-speed/low-speed connections, SuperSpeed USB and high-speed connectivity are disabled on thedownstream ports.

The TUSB8042 supports per port or ganged power switching andover-current protection, and supports battery charging applications.

An individually port power controlled hub switches power on or off to each downstreamport as requested by the USB host. Also when an individually port power controlled hub senses anover-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 beon for any port. The power to the downstream ports is not switched off unless all ports are in astate that allows power to be removed. Also when a ganged hub senses an over-current event, powerto all downstream ports will be switched off.

The TUSB8042 downstream ports provide support for battery chargingapplications by providing Battery Charging Downstream Port (CDP) handshaking support. It alsosupports a Dedicated Charging Port (DCP) mode when the upstream port is not connected. The DCP modesupports USB devices which support with the USB Battery Charging,Galaxy Charging, and Chinese TelecommunicationsIndustry Standard YD/T 1591-2009. In addition when upstream port is unconnected, theTUSB8042 supports the divider charging port modes (ACPx modes) and an automatictransition through all modes, starting with ACP3 and ending inDCP.

The TUSB8042 provides pin strap configuration for some featuresincluding battery charging support, and also provides customization though OTP ROM,I²C EEPROM, or via an I²C/SMBus slaveinterface for PID, VID, and custom port and phy configurations. Custom string support is alsoavailable when using an I²C EEPROM or theI²C/SMBus slave interface.

The device is available in a 64-pin RGC package and is offered in a commercialversion for operation over thetemperature range of 0°C to 70°C.