LPC43xx USB0 Power Domain

[dimadiman]

Hello!

I have a problem. I worked on LPC4337 device powered by the USB bus. Power 3.3V produces a dc-dc converter TPS62067. Used Peripherals - USB interface, SPI and SPIFI (connected 2 SD card). Made a few dozen devices. With a fairly frequent use of the controllers have begun to fail. Namely, when the USB connection to the PC terminal.

I find out what goes down USB0 power domain. This domain power punches and it has a short to ground GND. Power supply to the domain through contacts and USB0_VDDA3V_DRIVER USB0_VDDA3V3. Used circuit according LPC1830_Xplorer_schematic.pdf. And if I disconnect the power from the domain of USB (desoldering ferrite), the core and the periphery of the controller function with the exception of USB interface.

What could be the reason?

[Hui_Ma]

Hi

I think there still be the hardware circuit issue. Could you record the USB0_VDDA3V3_DRIVER & USB0_VDDA3V3 refer voltage 3V3 with scope? And record if the TPS62067 DC-DC converter output voltage with the same drop?

Please check if that voltage drop happen during USB0 module operation?

Thank you for the attention.

Have a great day,
Ma Hui
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[dimadiman]

Thanks!

Voltages were tested oscilloscope in different modes . When you turn the device into a USB port , with the read and write operations are no problems .

There is already asking questions how to connect the VBUS (+ 5V ) to the input USB0_VBUS controller . I have been connected directly to the USB socket USB0_VBUS contact. I believe this is the reason ! Fixed circuit and connected to the contact USB0_VBUS power from + 3.3V regulator .

While the test ...