Using an 8-pin PSoC to Produce 100Khz Pseudo Random White Noise with a Six Hour Period
By using the programmable blocks of a Cypress MicroSystems CY8C25122 PSoC microprocessor, it is possible to construct a 100Khz bandwidth white noise generator that provides a unique output sequence for six hours before repeating.
The schematic in Figure 1 exemplifies the simplicity of the hardware design. Since the PSoC chip has an internal oscillator with PLL that allows clocking up to 24Mhz, no external crystal is necessary.
The block diagram in Figure 2
The clock enable is routed to the outside that noise generation can be enabled and disabled if desired. The clock output is also provided for synchronization with the noise or the random sequence.
An FFT of the white noise generated by this circuit can be seen in Figure 3