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CY8C4127LQI-BL453 Datasheet(PDF) 10 Page - Cypress Semiconductor |
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CY8C4127LQI-BL453 Datasheet(HTML) 10 Page - Cypress Semiconductor |
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10 / 47 page  PRELIMINARY PSoC® 4: PSoC 4XX8_BLE Family Datasheet Document Number: 001-94624 Rev. *K Page 10 of 47 Special-Function Peripherals LCD Segment Drive PSoC 4XX8_BLE has an LCD controller, which can drive up to four commons and up to 32 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. The digital correlation method modulates the frequency and 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 zero. This method is good for STN displays but may result in reduced contrast with TN (cheaper) displays. The PWM method drives the panel with PWM signals to effec- tively 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 mode, refreshing a small display buffer (four bits; one 32-bit register per port). CapSense CapSense is supported on all pins in PSoC 4XX8_BLE through a CapSense Sigma-Delta (CSD) block that can be connected to any pin through an analog mux bus that any GPIO pin can be connected to via an Analog switch. CapSense function can thus be provided on any pin or group of pins in a system under software control. A Component is provided for the CapSense block to make it easy for the user. The shield voltage can be driven on another mux bus to provide liquid-tolerance capability. Liquid tolerance is provided by driving the shield electrode in phase with the sense electrode to keep the shield capacitance from attenuating the sensed input. 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 liquid tolerance (one IDAC is available). |
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