CY8C20111-SX1I - One-Button Capacitive Touch | Infineon
MPN: CY8C20111-SX1I ✗ End of Life| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
CY8C20111-SX1I Overview
A capacitive-touch controller is an integrated circuit that measures changes in capacitance caused by a conductive surface, typically a copper button or pad, and converts that change into a digital output. The CY8C20111 belongs to the broader hierarchy of capacitive sensing integrated circuits, touch controllers, interface controllers, and embedded mixed-signal semiconductors. CapSense controllers are useful in appliance controls, access panels, medical equipment, and industrial interfaces where sealed or low-profile controls are preferred.
The verified listing identifies the CY8C20111 as the one-button member of the CapSense Express family. The same source states that CY8C20121 supports two capacitive sensing buttons and two general-purpose outputs, while CY8C20111 supports one capacitive sensing button and one general-purpose output. This distinction is important when comparing the devices: the one-button CY8C20111 may be the simpler choice for a single touch zone, whereas CY8C20121 provides additional sensing and output resources.
The I2C/2-Wire interface allows the controller to participate in a host-controlled embedded system rather than operating as a completely independent user interface. Designers should confirm host address, serial timing, pull-up requirements, firmware behavior, and electrical limits against the manufacturer datasheet before finalizing the interface. The 8-SOIC package supports conventional surface-mount assembly, although the verified material does not provide dimensions or pin numbering.
Typical use cases include touch panels for household appliances, compact control modules, equipment front panels, and low-profile controls where a conventional mechanical switch would be undesirable. The capacitive sensing electrode should be designed with the controller’s recommended layout, guarding, shield, and grounding techniques. Environmental factors such as moisture, nearby conductors, enclosure materials, and human-body loading can affect sensor performance.
The CY8C20111-SX1I is best suited to designers seeking a dedicated one-button touch controller with serial connectivity in an established SOIC footprint. Before purchasing, verify current lifecycle status, pricing, availability, temperature range, supply voltage, operating current, output timing, and the exact pinout using the latest manufacturer documentation.
This page combines verified distributor identification, package and interface information, source traceability, and application guidance. It does not infer electrical limits, pricing, pin names, or compliance claims that are absent from the supplied data.
Drop-in alternatives for CY8C20111-SX1I — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
CY8C20111-SX1IT
✅ Drop-In📋 Reference alternative (not in catalog)
CY8C20142-SX1I
✅ Drop-In📋 Reference alternative (not in catalog)
CY8C20121-SX1I
✅ Drop-In📋 Reference alternative (not in catalog)
CY8CMBR3102-SX1I
✅ Drop-In📋 Reference alternative (not in catalog)
CY8C20111-SX1I Specifications
| Product Type | CapSense Express capacitive-touch controller |
| Number of Capacitive Touch Buttons | 1 button |
| General-Purpose Outputs | 1 output |
| Interface | I2C/2-Wire |
| Package | 8-SOIC |
| Package Type | 8-pin SOIC |
| Mounting Type | Surface Mount |
| Manufacturer | Infineon Technologies |
| Original Product Family | CapSense Express |
| Application Category | Capacitive touch button |
| Sensor Type | Capacitive sensing |
CY8C20111-SX1I 8-pin soic Pin Configuration Guide
Pin configuration for CY8C20111-SX1I (8-pin soic package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for CY8C20111-SX1I.
Refer to the datasheet for full pin configuration.
Typical Applications
CY8C20111-SX1I is suitable for 6 applications: Appliance Touch Control, Equipment Front Panel, Access-Control Interface, Medical Device Control, Consumer Accessory Button, Battery-Powered Sensor Module.
Appliance Touch Control
The CY8C20111-SX1I fits a single-button appliance interface where a sealed capacitive surface is preferable to a mechanical switch. Its verified one-button architecture limits the control panel to one touch zone, while the I2C/2-Wire interface can report state to a host controller. The 8-SOIC package also supports conventional surface-mount PCB assembly. The electrode geometry, shield, grounding, and enclosure material must be validated in the final mechanical design.
Recommended
Equipment Front Panel
A single capacitive button can provide a clean front-panel control for laboratory, industrial, or instrumentation equipment. The CY8C20111-SX1I is appropriate when the panel needs one user action rather than a keypad, and the I2C/2-Wire connection allows a system controller to monitor the touch event. Use careful sensor routing and grounding to reduce coupling from adjacent display, relay, or switching circuitry. Exact timing and electrical limits require the manufacturer datasheet.
Recommended
Access-Control Interface
The CY8C20111-SX1I can serve as the sensing element in a compact access-control or authorization interface that uses one touch event to trigger a host-controlled action. The single-channel arrangement simplifies user interaction and reduces the number of sensing electrodes. Designers should account for finger loading, moisture, conductive handles, and enclosure geometry because these conditions influence capacitive transfer. Firmware should debounce and interpret events according to the controller’s verified timing behavior.
Recommended
Medical Device Control
A one-button capacitive interface may be useful in medical equipment where a sealed, low-profile control surface is desirable. The CY8C20111-SX1I provides a dedicated touch-sensing channel and serial host communication, but the supplied data does not establish medical certification, isolation, leakage-current compliance, or extended-temperature suitability. Those requirements must be independently verified before clinical deployment. Mechanical cleaning, fluid exposure, and conductive patient-contact surfaces should be evaluated experimentally.
Recommended
Consumer Accessory Button
The CY8C20111-SX1I can add a compact touch control to a consumer accessory or compact control module without requiring a conventional tactile switch. Its one-button format is appropriate for wake, mode, or activation functions, while I2C/2-Wire communication lets a nearby controller manage the event. The final design should test sensitivity with the production enclosure and expected touch surfaces, and should maintain separation from noisy power or display circuitry. The available verified material does not specify output drive or timing values.
Recommended
Battery-Powered Sensor Module
A single touch button may provide a user wake or configuration input on a battery-powered sensor module. The CY8C20111-SX1I’s dedicated touch-controller architecture can offload sensing from the application processor, but the available data does not state sleep current, active current, or supply voltage. Low-power suitability must therefore be checked in the full datasheet. The I2C/2-Wire connection should be configured so the host can wake the system efficiently and avoid unnecessary bus traffic.
Recommended
Recommended Products Summary
Engineering reference data for CY8C20111-SX1I — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | CY8C20111-SX1IT | CY8C20142-SX1I | CY8C20121-SX1I | CY8CMBR3102-SX1I |
|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Infineon Technologies | Cypress Semiconductor | Cypress Semiconductor | Cypress Semiconductor | Infineon Technologies |
| Interface | I2C/2-Wire | I2C/2-Wire | I2C/2-Wire | I2C/2-Wire | I2C |
| Application Category | Capacitive touch button controller | Capacitive touch button controller | Capacitive touch controller | Two-button capacitive touch controller | CapSense controller |
| Surface Mount | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Dedicated one-button sensing configuration (vs CY8C20121-SX1I)
- Single general-purpose output resource (vs CY8C20121-SX1I)
- I2C/2-Wire host connectivity (vs CY8CMBR3102-SX1I)
Design Notes
Keep the capacitive sensor trace short and follow the manufacturer’s recommended electrode, guard, and shield arrangement. Route the sensing node away from switching nodes, high-current returns, oscillators, and display connectors. Because the supplied data does not include exact layout dimensions, use the manufacturer datasheet and tune the final electrode with the production enclosure rather than copying generic values.
Treat the I2C/2-Wire bus as a shared communication resource and verify pull-up voltage, rise time, capacitance, and maximum bus speed from the datasheet. Place any required pull-up components close to the bus endpoints and keep the sensing trace away from the serial route where possible. Confirm host firmware behavior and debounce requirements before production release.
Do not assume CY8C20121 is interchangeable with CY8C20111: the verified family data shows two capacitive buttons and two general-purpose outputs for CY8C20121 versus one button and one output for CY8C20111. Also do not infer automotive qualification, temperature limits, electrical ratings, or RoHS status from the family name. Verify these details in the latest manufacturer documentation.
Compliance Information
Compliance claims are not present in the supplied verified data. AEC-Q100 is marked not_applicable only because no automotive qualification is stated; this is not evidence that the part is unsuitable for every automotive or industrial requirement.
