The TUSB8044A is a four-port USB 3.2 x1 Gen1 (5 Gbps) hub. It provides
simultaneous SuperSpeed USB and high-speed/full-speed connections on the upstream port and provides
SuperSpeed USB, high-speed, full-speed, or low-speed connections on the downstream ports. When the
upstream port is connected to an electrical environment that only supports high-speed or
full-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 supports
full-speed/low-speed connections, SuperSpeed USB and high-speed connectivity are disabled on the
The TUSB8044A supports per port or ganged power switching and
over-current protection, and supports battery charging applications.
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 over-current event, power
to all downstream ports will be switched off.
The TUSB8044A downstream ports provide support for battery charging
applications by providing Battery Charging 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 with the USB Battery Charging, Galaxy Charging, and Chinese
Telecommunications Industry Standard YD/T 1591-2009. In addition when upstream port is
unconnected, the TUSB8044A supports the divider charging port modes (ACPx modes)
and an automatic transition through all modes, starting with ACP3 and ending in DCP.
Integrated in the TUSB8044A is a USB2.0
Billboard device which complies to the "USB Device Class Definition for Billboard Devices Version
1.21" specification. The billboard device is attached to the highest number downstream port of the
TUSB8044A USB 2.0 hub. The purpose of the billboard is to communicate Alternate
Mode status to the host system. The TUSB8044A supports only one Alternate
The TUSB8044A provides pin strap configuration for some features
including battery charging support, and also provides customization though OTP ROM,
I2C EEPROM, or via 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 interface.
The TUSB8044A supports
programming of an attached EEPROM through its internal USB HID to I2C
The device is available in a 64-pin RGC package and is offered in a commercial version
(TUSB8044A) for operation over the temperature range of 0°C to 70°C, and in an
industrial version (TUSB8044AI) for operation over the temperature range of –40°C