DSS #5: PWM Signal Generation w/ LED Dimming

The premise of this document is to familiarize users with the generation of a pulse width modulated signal on the PIC12F683 from Microchip. Once the desired PWM frequency and duty cycle range has been established, a dimming application using the BL-32D0-0133 light engine from Lamina is explored.

The PIC12F683-I/P from Microchip contains several features that make it a worthwhile candidate for
numerous applications. Regarding this discussion, first and foremost is its “Capture, Compare, PWM” module
CCP). Secondly, is its internal 8MHz oscillator, which can be divided down via software to one of eight
distinct clock frequencies.

The device selected to make use of the PWM signal is the BL-32D0-0133 white light engine from Lamina.
With proper heat sinking, applying 11.3 volts (VBFB) at 2.3 amps will produce a nominal 567 lumens of white
light.