DS90UB960-Q1EVM: Disable PoC?

Easiest way would be to leave J11 and J12 Open. You probably have the user guide already but just as an FYI, there's schematics at the end of the guide.

Regards,
Mandeep Singh

Hi Mandeep,

My customer disabled PoC (opend J11 and J12) and am supplying VDD3V3 and VDD1V8 externally (removed R123, R134, R121, R133, and R142). They're measuring 43mA and 177mA for those supplies respectively. The datasheet typical value is 160mA for 1V8. They'd like to know why their measurement is so low. There is no daughter card or camera connected, would that be why?

Thanks,

Michael

Hi Michael,

There's multiple factors that need to be considered as power consumption will change with different configurations. We list the IDDT current consumption in the DS90UB960-Q1 datasheet page 9. Where are you seeing 160mA for 1.8V in the datasheet? Additionally, where exactly on the board are you supplying these voltages?

Regards,
Mandeep Singh

Hi Mandeep,

Here's where I see 160mA:

Am I reading this wrong? VDDPLL, VDDD, and VDDDRV are all powered by 1V8 right?

The supplies are coming in at J34 and J35

Thanks,

Michael

Hi Michael,

Are you asking about 960 or 953? This is the power consumption of the 953, not 960. The power for the 953 would be from the PoC network.

Regards,

Mandeep Singh

J34 and J35 supply the 960.

Do you have any further questions or still need support with this?

Regards,

Mandeep Singh

Hi Mandeep,

I think I confused the two boards. My question is on the 953. 3V3 and 1V8 are being supplied at J20 and J14.

So do current draws of 177mA (3V3) and 43mA (1V8) from an external supply make sense if there is no daughter card and camera?

Thanks,

Michael

Hi Michael,

3V3 isn't a supply rail for the 953, it's for some of the other components on the board like USB2ANY or the i2c level shifter, so knowing the current on this won't give you info on how much the part is consuming.

Now, the 1.8V is the power rail for the DS90UB953-Q1; your results are showing a very low current consumption value compared to the datasheet value. However, the datasheet value is based on a test condition of the serializer input working. My recommendation would be to try sending CSI into the part and then monitor what the 1.8V rail is consuming and this will give a better side by side comparison. The consumption of the imager would not be dependent on the 1.8V rail in the EVM, it's tied in with the 3.3V and PoC.

Regards,

Mandeep Singh

Hi Michael,

Do you have any further questions or need any further support on this topic?

Regards,
Mandeep Singh