Leds - Ublox BMD-38 EVK User Manual

BMD-34 / 38 EVK - User guide

2.4 LEDs

User LEDs are provided on the evaluation board - two red and two green. An RGB LED is
included as well and can be enabled by changing the position of JLED. LEDs are powered by
VIO and are active low. The GPIO should be enabled for high drive when sinking current for the
LEDs. The LEDs can be completely removed from the circuit by breaking the associated
jumper.
Figure 6: Schematic – User LEDs
The evaluation board allows for easy serial communication with the BMD-34 module and a
connected computer. The Interface IC provides a virtual COM port USB device that connects
to four GPIO pins on the module, allowing for UART communication with or without hardware
flow control. The UART lines can be isolated from the Interface IC by soldering the associated
jumpers.
UBX-19033356 - R06 Hardware description Page 9 of 20
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