SAMB11 XR and ZR modules

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What's the difference between these and MR? There is no datasheet and not even a pin count available. Yet you can already buy XR from e.g. Mouser with a lower price than MR. Mouser has a datasheet for it, but it is just the MR datasheet without anything about XR. Atmel site only shows the module size, which is clearly smaller, only 7.5 mm x 10.5 mm. According to Mouser description XR with an external antenna and ZR with chip antenna.

Are these just a smaller form factor modules with the same functionality or is there something new or missing?

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I got the datasheet around july 2016 from Atmel when I asked using their support system.

 

I do not think I am allowed to share the datasheet directly, but some points :

 

XR modules does not come with external 32kHz crystal and Antenna, so these has to be added to the customer board. 

 

SAMB11 - ZR (7.5 mm x 10.5 mm).