Design files for the SensorTag DevPack Breakout Board can be obtained from Circuit Maker. Circuit Maker is a free PCB design tool from Altium. Designs can be imported into Altium Designer.
At the time of writing [October 2015], there is limited instructions from Texas Instruments on how to build your own DevPack for the CC2650 SensorTag. These notes have been derived from studying the Build Your Own DevPack "Guide" and the SensorTag / example DevPack schematics.
The CC2650 Sensor Tag includes a 20 pin Samtec connector, Part No LSS-110-01-F-DV-A for spinning your own DevPacks. The connector is self mating, hence you don't need to worry about male and female versions.
The following table details the SensorTag DevPack Expansion connector:
As per the above notes, SensorTag includes an analog switch to allow it to be powered from the on-board CR2032 battery, or external power.
Rev 1.2.0 of the PCB (Rev A) included a TS5A3159A 1 Ohm SPDT Analog Switch, but could never correctly power the board in the absence of the on-board battery. Without the CR2032 inserted and with R23 not fitted, the analog switch as never powered. I would coach the board to start, by touching the BAT+ pad on the corner of the SensorTag board. This would provide enough energy to power the analog switch.
In this revised design, the DevPack Connector's pin 9 (VDD_OUT) is always directly connected to the Sensor Tag's VDD Supply. The load switch enables the battery, via the active low PWR_GOOD line. The load switch incorporates reverse current protection, ensuring the external power supply never attempts to charge the battery.
Texas Instruments appear to have multiple product pages for the Sensor Tag DevPacks, some with schematics and some without. This makes finding the schematics and design files for DEVPACK-DEBUG, DEVPACK-WATCH and DEVPACK_LED_AUDIO files difficult if you land on the wrong page.
Below is a list of direct links: