Saturday, 07 November 2009 14:15
M. Ganesh Raaja
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.
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Saturday, 07 November 2009 13:59
M. Ganesh Raaja
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.
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Monday, 26 October 2009 23:58
M. Ganesh Raaja
INTRODUCTION
Most if not all of the microcontroller designs that involve analog signal processing will require an ADC to convert an analog signal into a digital value that can be processed by the CPU. PSoC 1 has a vast selection of ADCs that can be used depending on the application, ADCINC, ADCINCVR, ADCINC14, DELSIG8, DELSIG11, DelSig to name a few. Most of the users, beginners to experts face some or other problem while using an ADC like ADC not completing the conversion, ADC result always zero, ADC result incorrect etc. Below are Five Golden Rules that will help you to tame the PSoC 1 ™ ADC.
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