TI E2E Community
Consumer & Computing
Consumer & Computing Forum
TUSB2036 - SHOW "USB Power Exceeded" in XP
I make a pcb with tusb2036 and two usb outs, like schematic:
the power supply is externall, so i put the /buspwr in low, like datasheet say, /ocprot and /overcur in high, for not overcurrent detection, mode in low, for crystal use.
but, if /buspwr in low, when i connetc the board in PC and put a pen driver - for example, in the usb port (CN7), the windows xp show me the message "usb power exceeded".
if i power off the circuit, put the /buspwr in high and power on, the circuit works.
i am wrong in my understanding? this pin should be put in low to work correctly?
i make another board with tusb2046 - see schematic 2046-1, this board works fine, with externall power supply too and pin /busspwr in low.
whay this difference between two hubs?
The functionality of the terminal BUSPWR is reversed between the TUSB2036 and the TUSB2046B.
On the TUSB2036 this terminal is active-low, so if you are using an external source for the device you should tie this terminal to 3.3V.
On the TUSB2046B this terminal is active-high, so if you are using an external source you should tie this terminal to ground.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.