SoM-112ES User Manual
Revision 1.00 © 2018
- 19 -
5
Appendix B: Jumper Settings
5.1
JB1 (Boot0 Source Selection)
Jumper
Position
Setting
Pins 1 & 2
B
Line Pulled High
Pins 2 & 3*
A
Line Pulled Low
*Default Setting
5.2
JB2 (Boot1 Source Selection)
Jumper
Position
Setting
Pins 1 & 2
B
Line Pulled High
Pins 2 & 3*
A
Line Pulled Low
*Default Setting
5.3
JB3 (Flash Write Protect)
Jumper
Position
Setting
Pins 1 & 2
B
Flash Disable
Pins 2 & 3*
A
Flash Enable
*Default Setting
5.4
JB4 (Standby Battery)
Jumper
Position
Setting
Pins 1 & 2
OFF
Disable Battery Backup
Pins 2 & 3*
ON
Enable Battery Backup
*Default Setting
5.5
JB5 (External SPI Interface Voltage)
Jumper
Position
Setting
Pins 1 & 2
5V
5V SPI Level
Pins 2 & 3*
3.3V
3.3V SPI Level
*Default Setting
5.6
JB6 (External I2C Interface Voltage)
Jumper
Position
Setting
Pins 1 & 2
5V
5V I²C Level
Pins 2 & 3*
3.3 V
3.3V I²C Level
*Default Setting
