1. PSoC® 4 Proximity Sensing Solution
Design Win Replication:
PSoC® 4 Proximity Sensing Solution
PSoC = Programmable System-on-Chip
Create a Low-Cost, Reliable, Low-Power Capacitive Proximity Sensing Solution
Owner: JOCA
Rev *A Tech lead: SHAS
Presentation: To provide an engineering overview to customers for a Cypress solution
Title slide: To define what the presentation will cover. The subtitle is a short sentence stating the key opportunity.

2. Capacitive Proximity Sensing Enables A Rich User Experience
Consumers want sleek products with a rich user experience
Systems that wake up automatically without a physical touch
User interfaces that respond to touchless gestures
Products that have a long battery life
Original equipment manufacturers (OEMs) want:
Reliable product performance in all environmental and noise conditions
Low BOM and tooling costs
Capacitive Proximity Sensing1 solutions deliver a rich user experience at low cost with high reliability and low power consumption
Touchless Medical Lighting by Welch Allyn
Boom Box with Wake-on-Approach2 by Riva
Smartphone with Face Detection by Nokia
Capacitive Proximity Sensing enables touchless interfaces for medical equipment to reduce the spread of germs
Capacitive Proximity Sensing activates the user interface panel when a user’s hand approaches
Capacitive Proximity Sensing reduces cost by replacing expensive IR Sensors and their tooling cost
1 Method of detecting the presence of approaching objects, without a physical touch, using capacitive sensors 2 Feature that activates the system from a low-power state when an object approaches
Market Vision: To define the market opportunity. Presents compelling data and end product photos relevant to the local market.

3. PSoC Terms PSoC Programmable Analog Block Continuous Time Block (CTB)
PSoC is the world’s only programmable embedded system-on-chip integrating an MCU core, Programmable Analog Blocks, Programmable Digital Blocks, Programmable Interconnect and Routing1 and CapSense
Programmable Analog Block
A hardware block that is configured using PSoC Components2 to create Analog Front Ends (AFEs), signal conditioning circuits with opamps and filters
Includes Continuous Time Blocks, analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
Continuous Time Block (CTB)
A Programmable Analog Block that is used to implement continuous time analog circuits such as opamps and programmable gain amplifiers (PGAs)
Programmable Digital Block
A hardware block that is configured using PSoC Components2 to implement custom digital peripherals and glue logic
Includes Universal Digital Blocks, Serial Communication Blocks (SCBs) and TCPWMs3
Universal Digital Block (UDB)
A PSoC Programmable Digital Block that contains: two programmable logic devices (PLDs), one programmable data path with an arithmetic logic unit (ALU), one status register and one control register
Configured in PSoC Creator4 using PSoC Components2, or the graphical state machine editor or Verilog code
Serial Communication Block (SCB)
A PSoC Programmable Digital Block that is configurable as a UART, SPI or I2C interface
Illustration of a PSoC Device Being Flexibly
Configured by Plugging in PSoC Components2
Signal conditioning and measurement, control
Illustration of a “Lego-like” PSoC Devices … breadboard
PSoC is the world's only programmable embedded system-on-chip integrating high-performance analog, PLD-based programmable logic, memory and a microcontroller on a single chip.
At a fundamental level PSoC is not EASY! It is new, and therefore HARD! So it will not resonate with the audience even if we have “made it easy”
Fix footnotes for the Tabs ask JFMD
With the above definitions we must always say custom digital peripherals and NOT custom digital interfaces!!!! To keep the brand consistent research?
IO or Io
Ios or IOs
A Programmable Analog Block used to implement opamps, PGAs, comparators, etc (dropped etc)
PSoC 4200 NPI
1 Connects the Programmable Analog Blocks, Programmable Digital Blocks and I/Os Timer, counter, pulse-width modulator (PWM)
2 Free embedded ICs represented by an icon in PSoC Creator software PSoC 3, PSoC 4 and PSoC 5 Integrated Design Environment (IDE) software that installs on your PC

4. PSoC Terms Timer, Counter, PWM (TCPWM) Block CapSense®
A PSoC Programmable Digital Block that is configurable as a 16-bit timer, counter, PWM or quadrature decoder
CapSense®
Cypress’s third-generation touch-sensing user interface solution that “just works” in noisy environments and in the presence of water
The industry’s No. 1 solution in sales by 4x over No. 2
Programmable Interconnect and Routing
Connects the Programmable Analog Blocks, Programmable Digital Blocks and I/Os
Enables flexible connections of internal analog and digital signals to internal buses and external I/Os
PSoC Creator™
PSoC 3, PSoC 4 and PSoC 5 Integrated Design Environment (IDE)
Software that installs on your PC that allows: Concurrent hardware and firmware design of PSoC systems, or PSoC hardware design followed by export to popular IDEs
Components
Free embedded ICs represented by an icon in PSoC Creator software
Used to integrate multiple ICs and system interfaces into one PSoC
Dragged and dropped as icons to design systems in PSoC Creator
Component Configuration Tools
Simple graphical user interfaces in PSoC Creator embedded in each Component
Used to customize Component parameters
100+ Components available
CapSense is used to implement Capacitive Proximity Sensing
Component Icon
Component Configuration Tool

5. PSoC and Additional Terms
An entry-level PSoC based on an ARM™ Cortex-M0 core
Enables capacitive touch sensing and Capacitive Proximity Sensing solutions
Capacitive Proximity Sensing
A method of detecting the presence of approaching objects, without a physical touch, using capacitive sensors
Proximity Sensing Distance
The distance at which the presence of an object can be detected by a proximity sensor
Infrared (IR) Sensor
A sensor that detects the presence of an object by measuring the IR light reflected by the object
Signal-to-Noise Ratio (SNR)
The ratio of the sensor signal, when the presence of an object is detected, to the noise signal of an isolated sensor
Capacitive Proximity Sensing systems need an SNR >5:1 to meet IEC1 standards
Sensor Ganging2
A feature in Capacitive Proximity Sensing systems in which multiple touch and proximity sensors are electrically connected as a single proximity sensor
Reduces system power consumption and scan times
Increases the Proximity Sensing Distance
1 The International Electrotechnical Commission is a regulatory organization that sets standards for all electrical, electronic and related technologies
2 Refer to slide 28 in the appendix for more details on Sensor Ganging
Terms of Art (ToA): To clearly define all ToAs used in the presentation for distributor salespeople with non-engineering backgrounds. To carefully and fully define Cypress-proprietary ToAs needed to explain our system solution.

6. Terms You Will Hear Today
Wake-on-Approach
A feature that activates the system from a low-power state when an object approaches
Reduces system power consumption and enhances the user experience
Face Detection
A smartphone feature that detects the presence of a user’s face
Dims the display to reduce power consumption and locks the screen to prevent false touches
Typically implemented using an expensive IR Sensor
Gesture Detection
A feature in user interfaces that detects and tracks the movement of an object
Touchless, three-dimensional Gesture Detection can be implemented using multiple proximity sensors
Application Programming Interfaces (API)
Simplified set of instructions used to interact with a Component
Reduces the firmware complexity of a design
Terms of Art (ToA): To clearly define all ToAs used in the presentation for distributor salespeople with non-engineering backgrounds. To carefully and fully define Cypress-proprietary ToAs needed to explain our system solution.

7. Design Problems Engineers Face
Traditional IR Sensor-based proximity sensing solutions are expensive
IR Sensors are expensive and require custom tooling to create openings for light to reach the sensors
Proximity sensing solutions can be unreliable
IR Sensors can generate false triggers when the ambient light or temperature changes
Most Capacitive Proximity Sensing solutions fail in the presence of water or noise
Designing low-power Capacitive Proximity Sensing solutions is difficult
Designs require the careful use of low-power modes
Engineers must minimize the time the MCU spends in active power mode scanning individual sensors
Hydration Station by Brita
PSoC 4 replaces IR Sensor-based Proximity Sensing with a low-cost and reliable Capacitive Proximity Sensing solution
Cypress’s PSoC 4 Capacitive Proximity Sensing solution solves these problems
Replaces IR Sensors with low-cost capacitive proximity sensors
Implements a reliable solution that is unaffected by changes in ambient light, temperature, the presence of water, or noise sources
Simplifies low-power system design by using flexible low-power modes and Sensor Ganging1 to minimize scan times
PSoC 4 provides a low-cost, reliable and low-power Capacitive Proximity Sensing solution
1 See slide 23 in the Appendix for more details on Sensor Ganging
Traditional Approach and Challenges: To present the traditional approach and the challenges engineers will face when using it to realize the Market Vision. Ends with a one-sentence segue clearly stating the benefit of the Cypress solution.

8. PSoC 4 Replaces IR Sensors
An expensive proximity sensing design using legacy IR Sensors…
Is simplified by using the drag-and-drop PSoC Creator CapSense Component…
And prototyped using the CapSense Proximity Shield…
To create a low-cost, reliable, low-power Capacitive Proximity Sensing solution.
CapSense CSD
CapSense Proximity Shield (CY8CKIT-024)
PSoC 4000 Pioneer Kit (CY8CKIT-040)
Legacy IR Sensors
CapSense Component and Configuration Tool
CapSense Dev Kit with Proximity Shield
Paper Towel Dispenser
To get started, you should:
Buy the $30 PSoC 4000 Pioneer Kit (CY8CKIT-040) or the $25 PSoC 4200 Pioneer Kit (CY8CKIT-042)
Buy the $20 CapSense Proximity Shield (CY8CKIT-024)
Install PSoC Creator software on your PC
Download the Proximity Sensing with CapSense App Note
Cypress Solution: To introduce CY products and show compellingly how they solve the challenges highlighted on the previous slide. To provide a short, clear list of what to do to get started.

9. PSoC 4 Implements Reliable Capacitive Proximity Sensing
PSoC 4 makes Capacitive Proximity Sensing “just work” in the presence of mist and water
Enables water-tolerant Capacitive Proximity Sensing designs with an SNR >5:1 at a Proximity Sensing Distance of 10 cm
PSoC 4 delivers reliable performance with high SNR and noise immunity
Enables reliable Capacitive Proximity Sensing designs with an SNR >5:1 at a Proximity Sensing Distance of 30 cm
Enables designs that meet all of the IEC1 standards for noise immunity
PSoC 4 delivers Capacitive Proximity Sensing solutions that “just work” with a high SNR
Smartphone with Face Detection by Oppo
French Door Refrigerator by Toshiba
PSoC 4 enables reliable Face Detection in the presence of water
PSoC 4 detects a user’s hand and illuminates the refrigerator’s door handle. The system works reliably even in the presence of noise sources such as AC power supplies
1 The International Electrotechnical Commission is a regulatory organization that sets standards for all electrical, electronic and related technologies
Cypress Solution: To introduce CY products and show compellingly how they solve the challenges highlighted on the previous slide. To provide a short, clear list of what to do to get started.

10. PSoC 4 Simplifies Low-Power System Design
PSoC 4 uses multiple power modes to minimize system power consumption
Power management APIs in PSoC Creator enable an easy transition between low-power modes
Component APIs enable easy control of the power consumed by individual PSoC Components
Sensor Ganging5 further reduces power consumption
Reduces the number of scanned sensors to one, until an object is detected
Decreases the time PSoC 4 spends in active power mode scanning sensors, thereby reducing power consumption
PSoC 4 enables Capacitive Proximity Sensing solutions with an average current consumption as low as 5 μA
PSoC 4000 Power Modes1
Current Consumption
Code Execution
Digital
Peripherals Available
Analog
Peripherals
Available
Clock Sources Available
Wake-Up
Sources
Time
Active
2 6 MHz
Yes
All -
Sleep
1.1 mA No
Any interrupt source
Deep-sleep
2.5 μA
WDT2, I2C
POR3
32-kHz ILO4
GPIO, WDT, I2C
35 μs
CapSense Component Configuration Tool
The CapSense Component Configuration Tool enables the implementation of Sensor Ganging by simply checking a box for each of the sensors that needs to be connected
1 PSoC 4000 power modes are shown for reference. Read the PSoC 4 New 3 Power-on-reset Product Introduction for the power modes for other product families 4 Internal low-speed oscillator 2 Watchdog timer 5 See slide 23 in the Appendix for more details on Sensor Ganging
Cypress Solution: To introduce CY products and show compellingly how they solve the challenges highlighted on the previous slide. To provide a short, clear list of what to do to get started.

11. PSoC 4 Enables Advanced Capacitive Proximity Sensing Features
Wake-on-Approach reduces power consumption and enhances the user experience
Keeps the host processor and other ICs in standby or sleep modes until the presence of an object is detected
Turns on a backlight LED or performs other system functions when the presence of an object is detected
Gesture Detection enables touchless control of user interfaces
Uses multiple proximity sensors to detect and track the movement of objects in all three dimensions
Home Control Panel with Wake-on-Approach
Gesture-based Kitchen Towel Dispenser
Low-Power State: Only a single ganged sensor is scanned and other ICs in the design are kept in standby or sleep modes
Active State: When a user’s hand is detected, the individual button sensors are scanned and other ICs are brought to the active mode
Two proximity sensors are used to detect simple, vertical hand motions
Cypress Solution: To introduce CY products and show compellingly how they solve the challenges highlighted on the previous slide. To provide a short, clear list of what to do to get started.

12. PSoC® 4 Portfolio ARM® Cortex™-M0 | CapSense® | Capacitive Proximity Sensing
All devices in the PSoC 4 portfolio support Capacitive Proximity Sensing
PSoC MCU
PSoC 4000
Intelligent Analog
PSoC 4100
Programmable Digital
PSoC 4200
Programmable Analog
PSoC 4400
CY8C4128-BL
24 MHz, 256K/32K1, CMP2, Opamp, ADC3, SCB4, IDAC5, TCPWM6, BLE7
Q115
CY8C4248-BL
48 MHz, 256K/32K1, CMP2, Opamp, ADC3, SCB4, IDAC5, TCPWM6, BLE7, UDB8
Q115
CY8C4127-M
24 MHz, 128K/16K1
NDA Required
Contact Sale
NEW
NEW
CY8C4127-BL
24 MHz, 128K/16K1, CMP2, Opamp, ADC3, SCB4, IDAC5, TCPWM6, BLE7
Q414
NEW
CY8C4247-M
48 MHz, 128K/16K1
NDA Required
Contact Sales
CY8C4247-L
48 MHz, 128K/16K1
NDA Required
Contact Sales
NEW
CY8C4247-BL
48 MHz, 128K/16K1, CMP2, Opamp, ADC3, SCB4, IDAC5, TCPWM6, BLE7, UDB8
NEW
Q414
CY8C4126-M
24 MHz, 64K/8K1
NDA Required
Contact Sales
NEW
NEW
CY8C4246-M
48 MHz, 64K/8K1
NDA Required
Contact Sales
CY8C4246-L
48 MHz, 64K/8K1
NDA Required
Contact Sales
NEW
CY8C44x6
48 MHz, 64K/16K1
Concept Only
Contact Sales
CY8C4125
24 MHz, 32K/4K1,
CMP2, Opamp, ADC3, SCB4, IDAC5, TCPWM6
CY8C4245
48 MHz, 32K/4K1,
CMP2, Opamp, ADC3, SCB4, IDAC5, TCPWM6, UDB8
CY8C44x5
48 MHz, 32K/8K1
Concept Only
Contact Sales
3. BLE sampling
CY8C4014
16 MHz, 16K/2K1,
CMP2, I2C, IDAC5, TCPWM6
CY8C4124
24 MHz, 16K/4K1,
CMP2, Opamp, ADC3, SCB4, IDAC5, TCPWM6
CY8C4244
48 MHz, 16K/4K1,
CMP2, Opamp, ADC3, SCB4, IDAC5, TCPWM6, UDB8
CY8C4013
16 MHz, 8K/2K1,
CMP2, I2C, IDAC5, TCPWM6
1 Flash KB/SRAM KB 4 Serial communication block programmable as I2C/SPI/UART 7 Bluetooth Low Energy
2 Comparator 5 Current-output digital-to-analog converter 8 Universal digital block
3 Analog-to-digital converter 6 Timer/counter/PWM block
Production
Development
QQYY
Availability
Sampling
Concept
Status
Roadmap

13. PSoC 4000 Solution Example: Portable Digital Boom Box
PSoC Value
Block Diagram
Design Problems
Improve the battery life of the product by reducing the power consumption
Improve button performance in the presence of water (e.g. wet fingers)
PSoC 4000 Solution
Reduces the overall power consumption by implementing CapSense-based Wake-on-Approach
Implements reliable, water-tolerant CapSense buttons
PSoC 4000 One-Chip Solution
ARM® Cortex™-M0 MCU 2
I2C
CapSense 6
Host
PSoC uses Sensor Ganging to connect CapSense buttons as a proximity sensor
Suggested Collateral
Design Software: PSoC Creator
Kits: PSoC 4000 Pioneer Kit (CY8CKIT-040)
CapSense Proximity Shield (CY8CKIT-024)
Design Guide: Getting Started with CapSense
App Note: Proximity Sensing with CapSense
Portable Digital Boom Box by Logitech
PSoC Creator Components
PSoC 4000 can enable the system to remain in a low-power mode until a hand approaches, reducing power consumption
CapSense (Implements Capacitive Proximity Sensing)
I2C (Host processor communications interface)
Solution Examples: To give detailed one-page Solution Examples from the field in the specified format.

14. PSoC 4000 Solution Example: Induction Cooktop
PSoC Value
Block Diagram
Design Problems
Implement a user interface that works in the presence of liquids such as cooking oil or ketchup
Improve the aesthetics of the product with a user interface that lights up when a user’s hand approaches
PSoC 4000 Solution
Implements CapSense buttons, sliders and a proximity sensor that work reliably even in the presence of liquids
Drives a backlight LED that uses the proximity sensor input to indicate the presence of a user’s hand
PSoC 4000 One-Chip Solution 5
ARM® Cortex™-M0 MCU
LED
PWM1
CapSense 6 2
I2C
Host
Suggested Collateral
Capacitive Proximity Sensor
Design Software: PSoC Creator
Kits: PSoC 4000 Pioneer Kit (CY8CKIT-040)
CapSense Proximity Shield (CY8CKIT-024)
Design Guide: Getting Started with CapSense
App Note: Proximity Sensing with CapSense
PSoC Creator Components
Induction Cooktop by Midea
CapSense (Implements Capacitive Proximity Sensing)
I2C (Host processor communications interface)
PWM1 (Controls the brightness of an LED)
PSoC 4000 can enable a capacitive user interface featuring buttons, sliders and proximity sensors that work reliably in the presence of liquids
1 Pulse Width Modulator
Solution Examples: To give detailed one-page Solution Examples from the field in the specified format.

15. PSoC 4000 Capacitive Proximity Sensing Solution vs. Competition
Feature
CY8C4014LQI-4221
AT42QT2120-MMH
MKL02Z16VFK4
PIC16F689-I/ML
No. of Proximity Sensors 16 12
Sensor Ganging
Yes No
Proximity Sensing
Distance
30 cm
25 cm
20 cm
Water Tolerance
Communication Interfaces
I2C, UART2
I2C
I2C, SPI, UART
1 The indicated device is an entry-level PSoC 4000 device. Other devices in the PSoC 4 portfolio featuring more GPIOs and communication interfaces can also be used with the same Capacitive Proximity Sensing performance
2 PSoC 4000 supports a software transmit UART Component
Competitive Comparison: To define key features of the Cypress solution and demonstrate its superiority over the Next Best Alternatives (NBAs). Must be credible and objective to the salesperson and customer.

16. PSoC 4000 Capacitive Proximity Sensing Solution Value vs. Competition
$1.23
$0.12
$1.35
Competitor
Capacitive Proximity Sensing
Total Additional Value
Total Value Delivered
Target Cypress Solution:
Total Cost:
11% Total Savings:
CY8C4014LQI-421
$1.201
$0.15
Capacitive touch controller: Atmel AT42QT2120-MMH
Value Added: $0.121
Sensor Ganging: Reduces system power consumption and increases the effective battery life of the product
Water Tolerance: Enables capacitive buttons and proximity sensors that do not fail in the presence of water
1 Digikey 1ku pricing on 08/04/2014
EVC Slide: To clearly define the value of the Cypress solution, including BOM integration and unique functionality.

17. PSoC 4000 Capacitive Proximity Sensing Solution Value vs. IR Sensors
$1.22
$0.08
$1.30
Competitor
Tooling
Total Additional Value
Total Value Delivered
Target PSoC Solution:
Total Cost:
14% Total Savings:
CY8C4014SXI-420
$0.18
Value Added: $0.08
Additional Value PSoC Delivers
Reliability: Minimizes false triggers caused by changes in ambient light or temperature
Water Tolerance: Enables capacitive proximity sensors that do not fail in the presence of water
1 Digikey 1ku pricing on 08/04/2014
EVC Slide: To clearly define the value of the Cypress solution, including BOM integration and unique functionality.

18. Here’s How to Get Started
Buy the $30 PSoC 4000 Pioneer Kit and the $20 CapSense Proximity Shield
Download and install our PSoC Creator software
Download the Proximity Sensing with CapSense App Note
Touchless Kitchen Faucet by Muco BV
PSoC can replace traditional IR Sensors with water-tolerant capacitive proximity sensors capable of Gesture Detection
Yoga 8-inch Tablet by Lenovo
Doorbell and Touch Sensor Keypad RFID Reader
by Hubell Technology
PSoC implements multiple capacitive proximity sensors on the back of the tablet to detect the presence of a user
PSoC can use Sensor Ganging to implement Wake-on-Approach and improve aesthetics
Call to Action: To tell customers how to start their design process.

19. APPENDIX 001-95620 Owner: JOCA Rev *A Tech lead: SHAS
Appendix: Contains scripted s and related Solution Examples. 18

20. References and Links
CapSense Proximity Sensing demo video: PSoC 4 Datasheets: Proximity Sensing with CapSense App Note: Getting Started with CapSense Design Guide: $30 PSoC 4000 Pioneer Kit (CY8CKIT-040): $25 PSoC 4200 Pioneer Kit (CY8CKIT-042): $20 CapSense Proximity Shield (CY8CKIT-024): PSoC Creator: Cypress Platform PSoC Solutions roadmap: Cypress CapSense Controllers roadmap:
Other available materials: Provide distributors with comprehensive view of resources to assist in selling the solution.

21. PSoC 4 System Design in PSoC Creator
Capacitive Proximity Sensing Example Project on Six Windows in PSoC Creator (Complete Production Design)
Explore the library of 100+ Components
Complete your hardware system design by dragging and dropping Component icons
Configure Components using a Component-specific Configuration Tool
Access Component datasheets directly from the Component Configuration Tool for technical specifications
Co-design your application firmware and hardware using the PSoC Creator IDE C-based compiler
Review the Proximity Sensing with CapSense App Note for usage guidelines 5 2 1 6 4 3
Proximity Sensing with CapSense App Note
CapSense Component Datasheet
CapSense Component Configuration Tool
Cypress Solution: To introduce CY products and show compellingly how they solve the challenges highlighted on the previous slide. To provide a short, clear list of what to do to get started.

22. PSoC 4000 Solution Example: Smartphone
PSoC Value
Block Diagram
Design Problems
Reduce the overall cost of the smartphone
Ensure robust Face Detection even in the presence of noise introduced by phone circuitry such as the wireless antennae
Prevent false triggers in the presence of mist and sweat
PSoC 4000 Solution
Enables CapSense-based Face Detection that replaces
expensive IR Sensors and eliminates additional tooling costs1
Delivers solutions with a high SNR that work robustly even in noisy environments
Enables water-tolerant designs
PSoC 4000 One-Chip Solution
ARM® Cortex™-M0 MCU
Capacitive
Proximity Sensors for Face Detection 2
I2C
CapSense 2
Host
Suggested Collateral
Design Software: PSoC Creator
Kits: PSoC 4000 Pioneer Kit (CY8CKIT-040)
CapSense Proximity Shield (CY8CKIT-024)
Design Guide: Getting Started with CapSense
App Note: Proximity Sensing with CapSense
Face Detection
in Nokia Asha 502
PSoC Creator Components
CapSense (Implements Capacitive Proximity Sensing)
I2C (Host processor communications interface)
PSoC 4000 reduces cost by replacing expensive IR Sensors and eliminating additional tooling
1 IR Sensors require slits to be added to the body of the phone for light to be transmitted and received. The addition of these slits increases the overall tooling cost of the phone
Solution Examples: To give detailed one-page Solution Examples from the field in the specified format.

23. How PSoC 4 Enables Capacitive Proximity Sensing
Capacitive proximity sensors sense an object without a physical touch
A capacitive proximity sensor is used to measure the change in capacitance between a pin and ground
An object near a capacitive proximity sensor increases the measured capacitance
CapSense algorithms and analog circuitry convert the measured analog capacitance to a digital raw count1
The presence of an object is detected when the raw count exceeds a user-defined Capacitive Proximity Sensing threshold
Proximity Sensor Without an Approaching Hand2
CX = 2CP + CFP
PCB
Overlay CP
Copper
Ground
CFP
Proximity Sensor
Proximity Sensor With an Approaching Hand
CFP = Capacitance added to the system by an approaching hand
CFP is dependent on the overlay material, overlay thickness, size of the sensor and the distance of the hand from the sensor
Raw Count Variation With an Approaching Hand
The raw count increases when a hand approaches a proximity sensor
Signal
Raw Count
Time (ms)
Proximity Sensing Threshold
No Hand
Hand
Noise
Baseline
40,200
40,000
40,400
40,600
800
400
1,200
1,600
CX = 2CP
PCB
Overlay CP
Copper
Ground
Proximity Sensor
CX = Total capacitance measured by the Capacitive Proximity Sensing system
CP = Parasitic capacitance3
1 A raw count is a digitized value of the capacitance of a proximity sensor 2 A hand is used here as an example. Capacitive Proximity Sensing will work with any object that can absorb or create an electrical charge (includes both metallic and non-metallic objects) 3 The intrinsic capacitance of printed circuit board (PCB) traces or other connections to a capacitive proximity sensor

24. How Sensor Ganging Works
Sensor Ganging electrically connects multiple capacitive sensors as a single proximity sensor
PSoC measures the change in capacitance of a touch sensor or proximity sensor as analog signals that can be summed, while most other competing MCUs measure it as a digital signal that cannot be summed
PSoC can electrically combine and measure these ganged analog signals as a single, low-noise analog signal
Sensor Ganging reduces the power consumption of a capacitive sensing system
Power consumption is directly proportional to the time the MCU spends scanning individual touch or proximity sensors
Sensor Ganging decreases the number of sensors scanned to a single sensor, thereby decreasing the time spent scanning sensors
Sensor Ganging increases the effective Proximity Sensing Distance
Sensor Ganging increases the effective area of the capacitive proximity sensor
Proximity Sensing Distance increases with a larger effective area
PSoC uniquely implements Sensor Ganging to reduce power consumption and increase Proximity Sensing Distance
Sensor Ganging on a 4-Button User Interface Panel S4
CP4 S2
CP2 S3
CP3 S1
CP1
CapSense
Total Capacitance = CP1 + CP2 + CP3 + CP4 CapSense buttons (S1-S4) are connected together to form a single proximity sensor
Wake-up Mode S4 S2 S3 CT S1
CapSense
Total Capacitance= CT The single proximity sensor is disconnected and individual CapSense buttons are scanned
When an object is detected
Sensing Mode
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