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CY8C4147AXI-S455 Datasheet(PDF) 9 Page - Cypress Semiconductor |
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CY8C4147AXI-S455 Datasheet(HTML) 9 Page - Cypress Semiconductor |
9 / 42 page PSoC® 4: PSoC 4100S Plus Datasheet Document Number: 002-19966 Rev. *F Page 9 of 42 Special Function Peripherals CapSense CapSense is supported in the PSoC 4100S Plus through a CapSense Sigma-Delta (CSD) block that can be connected to any pins through an analog multiplex bus via analog switches. CapSense function can thus be provided on any available pin or group of pins in a system under software control. A PSoC Creator component is provided for the CapSense block to make it easy for the user. Shield voltage can be driven on another analog multiplex bus to provide water-tolerance capability. Water tolerance is provided by driving the shield electrode in phase with the sense electrode to keep the shield capacitance from attenuating the sensed input. Proximity sensing can also be implemented. The CapSense block has two IDACs, which can be used for general purposes if CapSense is not being used (both IDACs are available in that case) or if CapSense is used without water tolerance (one IDAC is available). The CapSense block also provides a 10-bit Slope ADC function which can be used in conjunction with the CapSense function. The CapSense block is an advanced, low-noise, programmable block with programmable voltage references and current source ranges for improved sensitivity and flexibility. It can also use an external reference voltage. It has a full-wave CSD mode that alternates sensing to VDDA and ground to null out power-supply related noise. LCD Segment Drive PSoC 4100S Plus has an LCD controller, which can drive up to 4 commons and up to 50 segments. It uses full digital methods to drive the LCD segments requiring no generation of internal LCD voltages. The two methods used are referred to as Digital Correlation and PWM. Digital Correlation pertains to modulating the frequency and drive levels of the common and segment signals to generate the highest RMS voltage across a segment to light it up or to keep the RMS signal to zero. This method is good for STN displays but may result in reduced contrast with TN (cheaper) displays. PWM pertains to driving the panel with PWM signals to effectively use the capacitance of the panel to provide the integration of the modulated pulse-width to generate the desired LCD voltage. This method results in higher power consumption but can result in better results when driving TN displays. LCD operation is supported during Deep Sleep refreshing a small display buffer (4 bits; one 32-bit register per port). |
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