PSoC™ 5, 3 & 1 Forum Discussions

In electro-tech-online I asked about my need of making a device wich could generate a sinusoidal signal (by PWM method) with a 18F4550 Ucontroller, but it seem it is not possible. Someone named Dana suggested me to see the information about this cypress device.  So, the questions are:

1. Is it possible to make a threephasic 5 KHz signal (3 120 degrees unphased signals), wich could be used by a power stage to handle about 1 ampere each branch in some kind of power transistors?

2. If the signal is analog, is it a way to isolate the control stage from the power stage?

3. Is it possible to stop or restart this signals with a Ucontroller signal?    Or further, to control amplitude?

4. Do this device is sold and there are existences now on Mouser, Arrow or DigiKey?

Thank you for your time

Luis

Hi,

I'm doing some advanced DMA operations.  One of the advance techniques needs the TRQ input to the DMA component.

I'm having difficulty GUARANTEEing that the rising edge of the TRQ terminates the current DMA operation.

As an example of the issue, I've modified the program used in the Cypress-supplied App note "001-84810_AN84810_-_PSoC_3_and_PSoC_5LP_Advanced_DMA_Topics".

It replaces the ADC with a WaveDAC8 generating a sine wave and is clocked by an external clock of 100KHz.  The DMA moves the wave data in the WaveDAC8 to the VDAC8 data register.   This regenerates the sinewave to the pin assigned to the output of the VDAC8.

When you press on the switch (P2.2) on the CY8CKIT-059, the rising edge usually is ignored.  after usually many presses, the TRQ is respected and the indefinite DMA transfer is terminated.

I suspect I either didn't set up the SW configuration correctly or the HW state logic is not correct (or both).

I would appreciate understanding what I am missing.