Aaeon SBC-557 Manual page 29

CPU Vcore select S1 (2~6)
1.8V
6 5 4 3 2 1
ON
2.4V
6 5 4 3 2 1
ON
2.9V
6 5 4 3 2 1
ON
3.5V
6 5 4 3 2 1
ON
*default
2.0V
6 5 4 3 2 1
ON
2.6V
6 5 4 3 2 1
ON
3.3V
6 5 4 3 2 1
ON
Chapter 2 Installation 19
2.2V *
6 5 4 3 2 1
ON
2.8V
6 5 4 3 2 1
ON
3.4V
6 5 4 3 2 1
ON