1.2.1 mikroBUS Header

Headers J1 and J2 create the standard mikroBUS extension board header interface. The EV98D91A board complies with the large size of the mikroBUS extension. Pass-through headers are implemented on the board to allow for additional boards to be stacked on top of the EV98D91A development board. Extension boards stacked on top are limited to the mikroBUS small size extension boards.

Figure 1-3. Header Interface
Note: Only install R3 (3.3V) or R4 (5V) but not both. Default is 3.3V with R3.

J1 Signal Names/Pin Descriptions

  • J1 pin 7, 3.3V supply to board with R3 installed (default)
  • J1 pin 8, GND
  • All other signals not specified are unused

J2 Signal Names/Pin Descriptions

  • J2 pin 1, SIO_2 is the data signal for the SWI-PWM mode
  • J2 pin 2, INT (EPP#) is used to enable optional Parasitic Power boost mode (default, leave this floating)
  • J2 pin 3, 4, TX/RX are tied together and are used for the SWI mode of operation
  • J2 pin 7, 5V supply to board with R4 installed (uninstalled by default)
  • J2 pin 8, GND
  • All other signals not specified are unused