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Voltage Controlled Oscillator in PSoC3 and PSoC5

Monday, 21 June 2010 15:43 M. Ganesh Raaja
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Question: Is it possible to create a Voltage Controlled Oscillator in PSoC3 / PSoC5 using the PSoC3/PSoC5 hardware?

Answer: Yes.  With a handful of hardware components, it is possible to create a voltage controlled oscillator in PSoC3 / PSoC5.  The schematic of a voltage controlled oscillator is shown below.


Tags: PSoC3 PSoC5 Analog DAC
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Setting UART Baud Rate in PSoC3

Tuesday, 19 January 2010 06:21 M. Ganesh Raaja
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Question: How do I set the Baud Rate of the UART component in PSoC3?

Answer: There are two ways to set the Baud Rate of the UART component.

Option-1: Using the Standard Baud Rates

When the "Internal Clock" option is enabled in the Advanced tab in the UART component configuration window, the UART configuration window has a drop down list with standard baud rates from 110bps to 921.6kbps.  The baud rate for the UART can be selected from this list.  When this option is used, the PSoC Creator automatically sets the Clock source for the UART component. The below figure shows the screen shot of Baud Rate selection using standard baud rates.
Tags: PSoC3 PSoC5 Communication UART
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Finding Resource Usage in a PSoC3 / PSoC5 Project

Friday, 27 November 2009 16:25 M. Ganesh Raaja
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Question: How do I find out the resource usage in a PSoC3 or PSoC5 project?

Answer: The % of resources used in the PSoC3 or PSoC5 design may be found in the .rpt file in the Results tab of the Workspace Explorer. 

Tags: PSoC3 PSoC5
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VDAC8 - Connecting External Load

Saturday, 07 November 2009 14:15 M. Ganesh Raaja
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Question: How do I bring out the VDAC8 output in PSoC 3?  Can I connect the VDAC8 output directly to a pin?

Answer: VDAC8 in PSoC3 is implemented by using and IDAC and an internal Load resistance of 16K for 4V range and 4K for 1V range.  Following is the block diagram.




Tags: PSoC3 PSoC5 Analog DAC
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High Resolution Dithered DAC in PSoC 3

Saturday, 07 November 2009 13:59 M. Ganesh Raaja
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Question: How do I create a High Resolution DAC in PSoC 3?

Answer: A High Resolution DAC in PSoC3 may be created by using Dithering.

Dithering is a widely used technique in Digital Processing where a noise is intentionally introduced into a system to increase the resolution of the system.  Say we have an 8 bit DAC with a full scale value of 255mV.  Each count of the DAC represents 1mV.  What if we wanted an output of 1.25mV from the DAC.  Switch the DAC output between 1mv and 2mV keeping the output at 2mV 25% of the time and 1mV 75% of the time, the average value of the output would be 1.25mV.  For an output of 1.5mV, the DAC output should be maintained at 2mV for 50% of the time and 1mV 50% of the time.  See diagram below.
Tags: PSoC3 PSoC5 Analog DAC
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