User Guide

1LSb Octal DAC Evaluation Board User’s Guide
DS50003218A-page 20  2021 Microchip Technology Inc. and its subsidiaries
When the S1 switch is pressed, the SPI output waveform will be a saw-tooth shape, as
shown in the following figure. LED D5 will blink, while LEDs D2, D3 and D4 will be off.
This indicates SPI DAC is working and the output can be monitored on Channel 0 of
the SPI output. The frequency of the waveform can be modified using the potentiome-
ter on the curiosity board (see
Figure 2-18).
FIGURE 2-17: SPI OUTPUT SAW-TOOTH WAVEFORM (S1 SWITCH
PRESSED, LED D5 BLINKING, LEDS D2, D3 AND D4 OFF)
FIGURE 2-18: SPI OUTPUT SAW-TOOTH WAVE WITH VARYING
FREQUENCY USING THE POTENTIOMETER (S1 SWITCH
PRESSED, LED D5 BLINKING, LEDS D2, D3 AND D4 OFF)