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USBee ZX PWM Controller

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This section details the operation of the Pulse Width Modulator application that comes with the USBee ZX.  The Pulse Width Modulator application creates a Pulse Width Modulated output for all of the 8 digital lines on the USBee ZX. 

Below you see the application screen.

pwm controller

Each channel outputs a repeating waveform with a 1.46kHz frequency.  The period of the repeating waveform is made up of a high duration followed by a low duration and has 256 steps.  The length of the High duration is the PWM value that is shown.  The length of the Low duration is 256 - the High duration.

You can create a simple analog output voltage by using a series resistor and a capacitor to ground on each channel.

pw rate

The above shows 2 outputs of the PWM Controller.  Signal 0 shows the PWM value set to 31 (out of 255) and Signal 1 shows the PWM value of 137.  A value of 0 is all low, and a value of 255 is mostly high (one out of 256 is low).

Digital Channels Controlled

8

Analog Channels Controlled

0

Resolution

256 steps

PWM Frequency

1.46kHz

Control Mechanism

Slider Switch

Channel Output DriveCurrent

4mA

Output Low Level

< 0.8V

Output High Level

> 2.4V

 
 
 
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