Dear Kawabata-san,
the PCA9617A is more advanced, than the PCA9515, although these two are very similar. But what will work on the PCA9617A, might not work on the PCA9515. Yes, I would recommend you to use the PCA9617ADP-ARD, but then please consider also use the PCA9617A for your application.
With Best Regards,
Jozef
Dear Kawabata-san,
the PCA9617A is more advanced, than the PCA9515, although these two are very similar. But what will work on the PCA9617A, might not work on the PCA9515. Yes, I would recommend you to use the PCA9617ADP-ARD, but then please consider also use the PCA9617A for your application.
With Best Regards,
Jozef