Troubleshooting Camera Unlock Issues in UB960 System
Some boards in the UB960 system are unable to detect the camera and indicate unlock, possibly due to power supply and REFCLK issues. Questions arise regarding the power sequence, layout design concerns, and the impact of stub routing on unlocking functionality. Explore potential solutions and recommendations to address these challenges.
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Presentation Transcript
Issue 960 pair 953 and 933. some boards can t detect camera, and indicate unlock. The camera power is supplied external not use POC 2
Power sequence Measure power sequence, only one point is difference with d/s. In customer, the REFCLK sometimes is before 1.1V, and the first REFCLK Pulse is abnormal. Question: Does the REFCLK must be later than power supply? Does is may cause unlock? 3
FPDLINK Layout Questions In customer design, before connect 50ohm resistor, the RIN+ and RIN- is parallel routing. Is that a problem? blows is customer layout. In EVM design, the 50ohm resistor is close to connector, does that have effects? What is recommend for 50ohm? Close to connector or IC? 4
POC layout Question In customer design, there have stub routing between POC to FPDLINK. But, datasheet say should be avoid stub, does it have impact for unlock? 5
