Sync 2 CMOS image sensors like VD55G1 VD55G3

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I need to use 2 image sensors for tracking proposes, it would be nice if I could sync the two cameras.
I see that provide configurable GPIOS with signals like PWM/ PULSE/ VSYNC/ START OF FRAME.
Is there any application note/ reference design, on how to sync two image sensors ?  
Do I need an external PWM for this? or one sensor can be master (to generate pulse) and to provide clock to Slave sensor?
Also I would like to now if the two sensors can have the same clock source to sync MIPI clock.

Thank you.

[michaeltang]

Hello there,

Thank you for interesting in ST product and welcome to ST community.

In the user manual, you can search for keywords related to master/leader. In general, the sensor synchronization mode can be configured through the SYNC_MODE register to set the device as either leader/master or follower/slave.

To synchronize the image acquisition of two sensors, you can use one of the following approaches:

1. One sensor as leader/master, the other as follower/slave:
   • In this case, the two sensors can be connected through their GPIOs to synchronize the frame and trigger the exposure timing.
2. Both sensors as follower/slave
   • In this case, the trigger source must come from an external synchronization signal.

Please also make sure that the IO voltage levels are properly matched between the devices.

Regarding your question about the external clock, sharing the same external clock source should generally be fine. However, for image synchronization, the most critical points are the SYNC_MODE setting and the GPIO configuration.

Best regards,

Michael