ZigBee Stack for ez430 Chronos development kit

John Perez said:

I wish to inquire if TI is planning to add the ZigBee stack to the Chronus anytime in the near future.   I know there are two chip solutions provided but that form factor does not suit a watch application

While I don't speak specifically for the product group responsible for the implementation of the Z-Stack ZigBee stack solution, there are a few constraints regarding the Chronos platform which make the port infeasible.

1) The ZigBee stack (Z-Stack) will not fit in the available flash and ram resources found on the CC430 device on the Chronos watch.

2) The Z-Stack software solution supports 2.4GHz only.  Chronos is a sub-1GHz radio solution.

3) The radio subsystem of the CC430 is not IEEE 802.15.4 compliant, which is needed by ZigBee.

From a form factor standpoint, you might want to consider the CC2538 as a potential option.  You will need to decide if it meets your other design/application goals.

BlueTooth LE (Low Energy) is much more appealing for watch. You can consider this:

https://estore.ti.com/MSP-WDS430BT2000D-Bluetooth-Wearable-Watch-development-system-with-Digital-display-P2447.aspx

As Brandon said, Zigbee is operation at 2.4GHz, but EZ430 is operation at UHF frequency (433MHZ, 860MHz or 915MHz), so your should give up your desire on this matter.  Choose a suitable chip for your request, your wish will come true within a couple days.