AN14459 AN2041 AN2209 AN2292

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CapSenseDevice Method Selection Guide
AN14459
Author: Ryan Seguine Associated Project: Associated Part Family: CY8C201xx CY8C20x34, CY8C21x34, CY8C24x94 FREE SAMPLES HERE Software Version: PSoC Designer4.3 with EPCY8C20x34, EPCY8C24x94 EPNUMv3 Associated Application Notes: AN2041, AN2209, AN2292
This application note guides choosing PSoC® devices capacitive sensing methods applications using PSoC CapSense technologies.
Introduction
Cypress offers following four CapSense part families capable performing capacitive digital conversion:
CY8C201xx CapSense Express CY8C20x34 CY8C21x34 CY8C24x94
CY8C21534-24PVXI qualified automotive applications. CY8C20x34 available extended commercial range only. Both CY8C20x34 CY8C21x34 support capacitive sensors CY8C24x94 supports sensors. CY8C201xx CapSense Express family supports configurable Capacitive sensing inputs GPIOs drive, interrupt output, wake-up interrupt input other digital functionalities. These products support register based configuration through interface. Cypress offers following CapSense development tools ease use:
Table displays high level comparison PSoC CapSense devices. Parameters useful determining appropriate device application include:
PSoC Designer containing CapSense User Modules (UMs) PSoC Express with CapSense Integration CapSense Development Kits:
Number capacitive sensors Necessary supply voltage Communication means CapSense functionality required Package size Programmability versus Configurability
CY3218-CAPEXP1, CY3218-CAPEXP2, CY3218-CAPEXP3 CY8C201xx CY3203A CY8C20x34 CY3213A CY8C21x34 CY3214 CY8C24x94
Table High Level Comparison PSoC CapSense Devices
Parameter Additional Functionality Power Consumption Package Sizes Voltage Input Range March 2008 CY8C 201xx Lowest Lowest Smallest Lowest CY8C 20x34 High Lowest Smallest Lowest CY8C 21x34 Higher Lower Smaller Lower CY8C 24x94 Highest Small
Development tools allow designers adjust parameters each method pertaining their application. These parameters allow designers configure dynamic baseline control, harsh environment firmware compensation, finger detection, slider touchpad configuration, external passive component selection.
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Device Selection
Table CapSense Device Parameters page Appendix choose appropriate device. Many users prefer PSoC because perform multiple functions single device. Table provides overview real time device functions user modules) supported Cypress development tools within each CapSense device family. Table User Modules Each CapSense Device Family
201xx 20x34 21x34 Function Full-Speed Communication UART Slave Master UART, Counter/Timer Digital Timer Capture (with Deadband Option) Pseudo Random Sequencer (Including 7Segment Support) Miscellaneous 20x2 Controller Interface E2PROM Emulation Bootloader Full-Speed Bootloader Analog Mixed Signal Comparators Amplifiers (Programmable Gain Instrumentation 2-pole Band Pass Filter (Relaxation Oscillator) (Sigma Delta) (Successive Approximation) 13bit 8-32 8-32 8-32 8-32 24x94
CapSense utilize digital analog resources. utilize additional functions listed, reconfiguration required. This done either using Dynamic Reconfiguration tool within PSoC Designer Device Editor, referring appropriate technical reference manual manually configuring needed registers within application firmware. Many digital hardware functions recreated firmware. example, create PWM, internal clock timer's interrupt configured post periodically. Within interrupt, port pins drive toggled achieve desired frequency duty cycle. CapSense devices also have important distinctions areas like system clocking power supply options detailed Table Table Device Clocking Overview
Feature System Clock Speed 4.75-5.25V Speed 3.15-4.75V Speed 2.4-3.15V 201xx 20x34 21x34 6,12, 24x94
8-32 8-32 8-32 8-32
CapSense devices have robust capacitive sensing methods. Choose your device based application notes, then decide implementation method.
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CapSense
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Method Selection
PSoC supports capacitive sensing methods listed here: Table Method Performance Harsh Environments
External Stimulus 201xx 20x34 21x34 24x94
Successive Approximation Sigma-Delta Modulator
Radiated Immunity (1.9GHz) Radiated Immunity (800MHz) Radiated Immunity (144MHz) Radiated Immunity (90kHz)
Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent
Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Good Good
Each sensing methods associated PSoC Designer help designers configure PSoC sensing method. They are:
CapSense with Successive Approximation CapSense with Sigma-Delta Modulator
Table lists sensing methods supported each PSoC device. details parameters, block placement usage, application programming interfaces (APIs), associated datasheets contained within PSoC Designer. Table Available Methods Each CapSense Device
Device CY8C201xx CY8C20x34 CY8C21x34 CY8C24x94 Method Method
Conducted Mains Excellent Excellent Immunity (50/60Hz) Conducted Noise Immunity (10kHz1MHz) Power Supply Transient Good Good
Excellent Excellent
Excellent Excellent Excellent Excellent Excellent Excellent
GPIO Load Transient Excellent Excellent Discharge Horizontal Ground Excellent Excellent Plane Contact Discharge CapSense Overlay Excellent Excellent
Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Good Good
Discharge Excellent Excellent Exposed Ground Temperature Response Radiated Immunity (1.9GHz) Radiated Immunity (800 MHz) Radiated Immunity (144 MHz) Radiated Immunity kHz) Good Good
Note CapSense with Relaxation Oscillator (CSR) recommended designs. Contact your local Cypress guidance more details. recommended capacitive sensing methods. They perform extremely well harsh noisy environments, require only minimal external passive components configurable varying button sizes. Table provides overview performance each method typical application. Performance influenced sensor layout, overlay material thickness, update rate, resolution. validate methods, Cypress created harsh environment performance specification. These tests evaluate each method performs against various external stimuli. Relative comparisons each method based results these tests shown Table Table Method Performance
Feature Power Consumption Typical (1mm Overlay) Typical (3mm Overlay) 201xx Excellent Excellent Excellent 20x34 Excellent Excellent Excellent 21x34 Excellent Excellent Excellent 24x94 Excellent Excellent Excellent
Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent
Conducted Mains Excellent Excellent Immunity (50/60 Conducted Noise Excellent Excellent Immunity kHz-1 MHz) Power Supply Transient Excellent Excellent
Excellent Excellent Excellent Excellent Excellent Excellent
GPIO Load Transient Excellent Excellent Discharge Excellent Excellent Horizontal Ground Plane Contact Discharge CapSense Overlay Excellent Excellent
Excellent Excellent
Discharge Excellent Excellent Exposed Ground Temperature Response Good Good
Excellent Excellent Excellent Excellent
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Development
develop PSoC CapSense design, download install PSoC Designer PSoC Express development tool.
Differentiation
While both robust capacitive sensing methods, they differ their applicability certain designs. This section discusses similarities, drawbacks, advantages sensing methods. Both create switched capacitor circuit using sensing capacitor, switching between voltage rail measuring node. Because clock duty cycle, during half scan sensing capacitor connected voltage rail. This reduces input impedance, reducing amplitude external noise seen measurement data. circuit uses many available resources CY8C21x34 device. uses clocks, three digital blocks, comparator, both comparator columns, PWM. Projects that require must reconfigure into then back. interrupt unavailable loop timing, unless same settings used clock settings CSD. Another doing this extra digital block configured timer low-speed oscillator (calibration recommended oscillator used this type application). CY8C24x94 device, there hardware decimator, comparator reference based Vdd. This reduces resource consumption digital block analog column. However, clocks still used. features that CY8C20x34 does possess. First, uses pseudo-random clock switching clock well measurement clock. This reduces radiated emissions except main oscillator frequency. Second, provides means output clock switching frequency. this clock connected shield sensor surrounding actual sensor, count output from will differentiate between smaller nongrounded objects (like metal disks water) larger grounded objects (like humans). Please application note AN2398, Waterproof Capacitive Sensing. sensing method uses non-linear approach measure change capacitance. small change capacitance produces exponentially larger change measurement counts. Figure page comparison capacitance response each method. Table page equations describing each curve. Note Unless waterproof sensing required application, device selection used determine appropriate sensing method.
CapSense PSoC Express
PSoC Express brings simplicity block based design microcontrollers. useful tool that allows designers unfamiliar with real time embedded systems quickly build functional design. CapSense methods supported this development tool. PSoC CapSense sensor PSoC Express, place appropriate CapSense Sensor Inputs CapSense Properties Input. Similar Device Editor User Module properties, relevant parameters configurable through Properties Input. Support CapSense Express devices provided PSoC Express software tool. This tool various drivers configure these devices. details refer application note CapSense Express Software Tool AN42137. tune CapSense related parameters real time adjust sensitivity using this tool.
CapSense PSoC Designer
PSoC Designer integrated development environment (IDE) complete with debugger application editor supporting programming language assembly language. PSoC Designer also includes innovative device editor which allows users configure PSoC initialization prepackaged real time functions user modules PSoC projects. PSoC CapSense placed using device editor. After placed, sensors assigned pins using CapSense wizard. parameters governing configuration. Table lists parameters. Table User Module Parameters Supported Each Method
201xx 20x34 21x34 Parameter Sensor Debounce Detection Finger-on Startup Recovery Sensor Auto Reset Shield Sensor Environments Independent Finger Thresholds Buttons Configurable Finger Hysteresis Sensor Auto Calibration Configurable Interpolated Position Touchpad Capability (Multiple Sliders) March 2008 24x94
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Table CapSense Response Linearity Sensitivity Equations
Sensing Method Sensitivity/Resolution (Farads/Count) Max. (Farads) Linearity (Counts Nonlinear
dacCS Cbus FIMO
VREF FIMOCbus
Linear
Figure Capacitive Response Method Comparison
7000 6000 5000 4000
Counts
3000 2000 1000 Added Capacitance (pF)
Summary
When using PSoC capacitive sensing, four device families available provide robust sensing method CSD. Choose your device, based package, feature set, power needs require. PSoC just capacitive sensing device; ADC, full-speed device, pulse controller, frequency counter more.
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Appendix CapSense Device Parameters
Table CapSense Device Parameters
Part Family Device CY8C20110-LDX2I CY8C20110-LDX2I CY8C20140-LDX2I CY8C201xx CY8C20140-SX2I CY8C20142-SX1I CY8C20160-LDX2I CY8C20160-SX2I CY8C20180-LDX2I CY8C20180-SX2I CY8C201A0-SX2I CY8C20x34 CY8C20234-12LKX CY8C20334-12LFXC CY8C21634-24LFXI CY8C21234-24SXI CY8C21334-24PVXI CY8C21x34 CY8C21534-24PVXI CY8C21434-24LFXI CY8C21634-24LFXI CY8C21334-12PVXE CY8C21534-12PVXE CY8C24794-24LFXI CY8C24x94 CY8C24894-24LFXI CY8C24994-24LFXI CY8C24994-24BVXI Package QFN(3x3) SOIC QFN(3x3) SOIC SOIC QFN(3x3) SOIC QFN(3x3) SOIC SOIC QFN(3x3) QFN(4x4) QFN(5x5) SOIC SSOP SSOP QFN(5x5) QFN(5x5) SSOP SSOP QFN(8x8) QFN(8x8) QFN(8x8) VFBGA (6x6) Sensors Sensors Temp. Range Com-Ex Com-Ex Com-Ex Com-Ex Com-Ex Com-Ex Com-Ex Com-Ex Com-Ex Com-Ex Com-Ex Com-Ex Com-Ex Auto Auto CapSense Range 2.4-5.25 2.4-5.25 2.4-5.25 2.4-5.25 2.4-5.25 2.4-5.25 2.4-5.25 2.4-5.25 2.4-5.25 2.4-5.25 2.4-5.25 2.4-5.25 2.4-5.25 2.7-5.25 2.7-5.25 2.7-5.25 2.7-5.25 2.7-5.25 4.75-5.25 4.75-5.25 3.0-5.25 3.0-5.25 3.0-5.25 3.0-5.25 Flash
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About Author
Name: Title: Background: Contact: Ryan Seguine Product Manager, Senior University Washington capsense@cypress.com
PSoC registered trademark Cypress Semiconductor Corp. "Programmable System-on-Chip," PSoC Designer, PSoC Express trademarks Cypress Semiconductor Corp. other trademarks registered trademarks referenced herein property their respective owners.
Cypress Semiconductor Champion Court Jose, 95134-1709 Phone: 408-943-2600 Fax: 408-943-4730 http://www.cypress.com/ Cypress Semiconductor Corporation, 2007-2008. information contained herein subject change without notice. Cypress Semiconductor Corporation assumes responsibility circuitry other than circuitry embodied Cypress product. does convey imply license under patent other rights. Cypress products warranted intended used medical, life support, life saving, critical control safety applications, unless pursuant express written agreement with Cypress. Furthermore, Cypress does authorize products critical components life-support systems where malfunction failure reasonably expected result significant injury user. inclusion Cypress products life-support systems application implies that manufacturer assumes risk such doing indemnifies Cypress against charges. This Source Code (software and/or firmware) owned Cypress Semiconductor Corporation (Cypress) protected subject worldwide patent protection (United States foreign), United States copyright laws international treaty provisions. Cypress hereby grants licensee personal, non-exclusive, non-transferable license copy, use, modify, create derivative works compile Cypress Source Code derivative works sole purpose creating custom software firmware support licensee product used only conjunction with Cypress integrated circuit specified applicable agreement. reproduction, modification, translation, compilation, representation this Source Code except specified above prohibited without express written permission Cypress. Disclaimer: CYPRESS MAKES WARRANTY KIND, EXPRESS IMPLIED, WITH REGARD THIS MATERIAL, INCLUDING, LIMITED IMPLIED WARRANTIES MERCHANTABILITY FITNESS PARTICULAR PURPOSE. Cypress reserves right make changes without further notice materials described herein. Cypress does assume liability arising application product circuit described herein. Cypress does authorize products critical components life-support systems where malfunction failure reasonably expected result significant injury user. inclusion Cypress' product life-support systems application implies that manufacturer assumes risk such doing indemnifies Cypress against charges. limited subject applicable Cypress software license agreement.
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AN14459 AN2041 AN2209 AN2292

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