Description of PSoC 1 is incomplete without the mention of switched capacitor blocks. It is this feature, which makes the device unique. Switched capacitor blocks are highly configurable hardware blocks which can be configured to work as an amplifier, comparator, modulator, filter, ADC, DAC, integrator, differentiator and so on. And the story doesn't end here; you can even tune parameter of the function during run time. For example, changing the gain of amplifier, changing threshold in comparator, adjusting cut off frequency in filter, changing the integration time constant etc.
Here are some collaterals associated with switched capacitor blocks:
AN2041 - Understanding PSoC® 1 Switched Capacitor Analog Blocks - http://www.cypress.com/?rID=2899
AN2168 - PSoC® 1 - Understanding Switched Capacitor Filters - http://www.cypress.com/?rID=2880
AN2223 - PSoC® 1 - Approximating an Opamp with a Switched Capacitor Integrator - http://www.cypress.com/?rID=2630
AN2108 - PSoC® 1 - Implementing Hysteresis Comparator - http://www.cypress.com/?rID=2780
AN2161 - PSoC® 1 Analog - Voltage-to-Frequency Converter - http://www.cypress.com/?rID=2623
AN16833 - Signal Mixing with PSoC® Switched Capacitor Blocks - http://www.cypress.com/?rID=2925
Last but not the least...Technical reference manuals are the ultimate resource to understand any feature of PSoC 1 device in great amount of detail.
Technical reference manuals are available here-
http://www.cypress.com/?id=1573&rtID=117
Enjoy reading!
-Rajiv Badiger
