1.1 Schematic and Key Features One 8-Pin SOIC Socket (U1) One mikroBUS Connector (J1, J2) Five Selection Jumpers for selecting either an I2C or SPI Interface (J3 to J7) 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) Optional GPIO Header (J9) – Not Populated Figure 1-1. TA100 8-Pin SOIC Socket Board Schematic