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USB Superspeed Peripherals

VlKh_2251656
Contributor II

Good day.

Now we use CX3 chip with optical sensor.

We found an interesting phenomenon.

When supply voltage of mipi CX3 block is 3.3 V, all good.

When supply voltage for mipi block is 1.8 V, no video sygnal from CX3.

Enumeration is good.

Please, tell me, what is it ?

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1 Solution
YangyangC_06
Employee

Once you change the power supply of 3.3v to 1.8v, the SPI read operation could not complete correctly and CX3 could not boot from that.

View solution in original post

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YangyangC_06
Employee

Is it possible to share your schematic design here or by private message?

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VlKh_2251656
Contributor II

The scheme is the same as in the "Denebola" debug board.

On the debug board "Denebola", we notice the same behavior.

There it is possible to moving of the resistor to select the voltage level for the power supply of the MIPI unit of CX3.

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YangyangC_06
Employee

Once you change the power supply of 3.3v to 1.8v, the SPI read operation could not complete correctly and CX3 could not boot from that.

View solution in original post

VlKh_2251656
Contributor II

Dear,

Many thanks!

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