The TUSB8042A is a four-port USB 3.2 x1 Gen1 (5 Gbps) hub. It providessimultaneous SuperSpeed USB and high-speed/full-speed connections on the upstream port and providesSuperSpeed USB, high-speed, full-speed, or low-speed connections on the downstream ports. When theupstream port 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 TUSB8042A 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 is 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 is switched off.
The TUSB8042A 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 ChineseTelecommunications Industry Standard YD/T 1591-2009. In addition when upstream port isunconnected, the TUSB8042A supports the divider charging port modes (ACPx modes)and an automatic transition through all modes, starting with ACP3 and ending in DCP.
The TUSB8042A 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 commercial version(TUSB8042A) for operation over the temperature range of 0°C to 70°C, and in anindustrial version (TUSB8042AI) for operation over the temperature range of –40°Cto 85°C.