Spark Core v0.2.3 represents three significant improvements:
- Fixed a bug where the diode protecting the USB circuit could be blown if RAW was connected to GND. Fix involved replacing the diode with a beefier diode.
- Significantly changed the layout of the RF circuit to improve performance.
- Changed the load capacitance on the RTC crystal (and therefore its capacitors) in order to improve its performance.
Spark Core v0.2.3 will be going in for test production immediately. At this point the only design changes expected between this release and the final release would be silkscreen modifications and minor tweaks to the RF circuit.