Demonstration Design Jumpers - Lattice Semiconductor iCE40 UltraLite User Manual

Demonstration Design Jumpers

Lattice provides the RGB LED Driver Demo design programmed in the board. The RGB LED Driver Demo used in
conjunction with the software GUI illustrates the use of a PWM driver controlling the LEDs on the board. Below is a
description of the control jumpers for each LED.
• The RGB LED (U2) will transition colors
— J3 can be used to probe RGB LED (Default shunted). If you remove J3, the RGB LED will not light up.
• The IR LED (D6) is controlled when a jumper is placed across J4 pins 1-2
• The HP Torch LED (D7) is controlled when a jumper is placed across J4 pins 2-3
• The BARCODE LED (D8) is under FPGA control when a jumper is placed across J5 pins 2-3
— The IRLED FPGA output is 400 mA. This can be combined with 100 mA BARCODE FPGA output for a total
of 500 mA of drive current. This is performed when a jumper is placed across J5 pins 1-2. 
Note: This capability is not supported in the Demonstration Design
Figure 2 shows the default jumper locations.
Figure 2. Default Jumper Locations
J3 – RGB
Shunts
J4–Selects J5 – Selects
HP LED device Barcode output
(IR or Torch) (HP LED or D8)
iCE40 UltraLite Breakout Board
J2 – Enable
DONE LED
4
J16 – Enable
12 MHz clock
J15 – Program
SPI Flash or
iCE40UL
J14 – Isolate
SPI Flash
CSn