The TUSB2036 hub is a 3.3-V CMOS device that provides up to three downstream ports in
compliance with the USB 2.0 specification. Because this device is implemented with a digital state
machine instead of a microcontroller, no firmware programming is required. Fully-compliant USB
transceivers are integrated into the ASIC for all upstream and downstream ports. The downstream
ports support both full-speed and low-speed devices by automatically setting the slew rate
according to the speed of the device attached to the ports. The configuration of the
BUSPWR pin selects either the bus-powered or the self-powered mode. The
introduction of the DP0 pullup resistor disable pin, DP0PUR, makes it much easier to implement an
onboard bus/self-power dynamic-switching circuitry. With the new function pin, the end-equipment
vendor can reduce the total board cost while adding additional product value.
The EXTMEM (pin 26) enables or disables the optional EEPROM
interface. When EXTMEM is high, the vendor and product IDs (VID and PID) use
defaults, such that the message displayed during enumeration is General Purpose USB Hub.
The TUSB2036 supports both bus-powered and self-powered modes. External power-management
devices, such as the TPS2044, are required to control the 5-V power source switching (on/off) to
the downstream ports and to detect an overcurrent condition from the downstream ports individually
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 logic level of the MODE pin controls the selection of a crystal input to drive an
internal oscillator or an external clock source.
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