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USBee DX Mixed Signal Oscilloscope,

Logic Analyzer and Bus Analyzer

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 DX-PWM module

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This section details the operation of the Pulse Width Modulator application that comes with the USBee DX.  The Pulse Width Modulator application creates a Pulse Width Modulated output for all of the 16 digital lines on the USBee DX. 

Click OK to enter the application. Below you see the application screen.

dx-pwm module image 1

Each channel outputs a repeating waveform with a 1kHz 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.

dx-pwm image 2

The above shows 2 outputs of the PWM Controller.  Signal 1 shows the PWM value set to 31 (out of 255) and Signal 0 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).

PWM Controller Specifications

Digital Channels Controlled

16

Analog Channels Controlled

0

Resolution

256 steps

PWM Frequency

1.02kHz

Control Mechanism

Slider Switch

Channel  Output Drive Current

4mA

Output Low Level

< 0.8V

Output High Level

> 2.4V

 
 
 
 
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