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CY8C4127AXI-S445 Datasheet(PDF) 9 Page - Cypress Semiconductor

Part # CY8C4127AXI-S445
Description  Programmable System-on-Chip (PSoC)
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Manufacturer  CYPRESS [Cypress Semiconductor]
Direct Link  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

CY8C4127AXI-S445 Datasheet(HTML) 9 Page - Cypress Semiconductor

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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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