Different versions of the Development Kit (DK) have some hardware limitations and workarounds.
| PCA10121 revision | Limitation | Description | Workaround | Fixed in revision |
|---|---|---|---|---|
| Rev 1.0.0 | CS47L63 AD-DA converter (U2) may fail to start | On some occasions, the 1.2 V power supply for U2 is not provided at boot-up. This is caused by higher than expected inrush current. This function is tested in production. | Restart the DK or attach the battery to the DK before connecting the Universal Serial Bus (USB) cable. If the problem persists, contact Nordic Semiconductor and ask for a replacement. | Rev 1.0.1 |