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Which I2C bus is exposed on Nordic Thingy 52 for custom application development?

Hello fellow Nordic-ians,

I see that on the Nordic Thingy 52 I2C bus interface (SCL and SDA) is provided at 3 different ports i.e. P4, P5 and P7.

From other related documentation I understand that this is the external I2C bus provided for custom application development. This is not the same I2C bus which interfaces the environment sensors on Thingy. Is my understanding correct? 

If so, then does it mean that custom applications should only interface additional I2C devices only using the external I2C bus?

As I get it, the external I2C bus pins are SCL is 15 and SDA is 14. Please correct me if this is not correct.

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