1.1 Schematic and Key Features One 14-Pin SOIC Socket (U1) One mikroBUS Connector (J1, J2) On-Board 4.7 kΩ I2C Resistors (R2, R3) On-Board LED Power Indicator (LD1) Power Jumper for selecting 3.3V or 5V power (J3) Jumper for selecting which mikroBUS pin is connected to GPIO1 (J5) Optional GPIO Header (J4) – Not Populated Figure 1-1. TA100 14-Pin SOIC Socket Board Schematic