Revision 3 of the XPLAIN kit can be identified by a bar-code sticker on the back side with the following product ID: A09-0560/3.
Table 3. Difference between Xplain revision 2 and revision 3
| Difference | Comment |
|---|---|
| Series resistors on SDRAM lines removed | Not required – and therefore removed. |
| Shunt resistor (R105) added | This is a zero ohm resistor that enables measurement of the ATxmega128A1 current consumption. |
| Audio amplifier is default off (R300 is pulling down the SD line of the U300). | Reduce power consumption and reduce faint noise from speaker. |