CY8C20142-SX1I - 4-IO CapSense Controller | Infineon
MPN： CY8C20142-SX1I ✓ 啟用中CY8C20142-SX1I 概覽
A capacitive-touch controller is an interface IC that detects changes in capacitance caused by a user's finger and converts those analog changes into digital events. In the product hierarchy, this device is a CAPSENSE Express controller within the broader class of capacitive sensing controllers, interface ICs, and mixed-signal semiconductors. Its purpose is to replace discrete analog sensing networks with a configurable digital interface suitable for compact user-interface designs.
Key features include four configurable I/O channels that can be used as capacitive-sensing inputs or GPIOs, a 2.4 V to 5.5 V supply range, and I2C connectivity. One verified distributor listing identifies 2 kbits of device memory, while another describes 512 bytes of RAM and PWM capability. The SOIC-8 package provides a compact surface-mount footprint, and the -40°C to 85°C range supports industrial-temperature designs.
The device combines a small embedded controller with configurable sensing and GPIO resources. Its four channels can be allocated according to the interface requirements of the product, while the I2C interface allows a host microcontroller or system controller to configure and monitor touch events. Because it is a dedicated CapSense Express controller rather than a general-purpose MCU, it can reduce the sensing burden placed on the primary embedded processor.
Typical applications include appliance control panels, industrial touch buttons, equipment interfaces, consumer products, and low-cost human-machine interfaces. A connected host can read button states over I2C, update LED indicators through selected GPIOs, and respond to user input without dedicating a separate analog front end to capacitance measurement.
PCB layout is critical for reliable capacitive sensing. The sensing electrodes, their connecting traces, ground structures, and enclosure materials influence sensitivity and stability. Designers should follow the manufacturer's pinout and application guidance, keep sensitive routes short, provide a stable ground reference, and evaluate the complete mechanical and electrical environment rather than treating the controller as a conventional digital switch input.
This page consolidates the verified manufacturer and distributor information for CY8C20142-SX1I and adds package-specific design guidance, parameter comparisons, and a same-family replacement analysis. The alternative assessment is intentionally conservative: only controllers documented as using the same package are treated as potential drop-in parts, and unsupported electrical details are marked as data needed rather than estimated.
直接替換替代品，適用於 CY8C20142-SX1I — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： CY8C20142-SX1I （相同外形與佔位） — 差異在於 Interface, Package, Product Type.
CY8C20111-SX1I
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →CY8C20121-SX1I
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
CY8C20142-SX1I 規格
| Product Type | CAPSENSE Express capacitive-touch button controller |
| 工作電源電壓 | 2.4 V to 5.5 V |
| Number of Configurable I/O Channels | 4 |
| 介面 | I2C |
| 工作溫度範圍 | -40°C to 85°C |
| 封裝 | 8-pin SOIC |
| Package Detail | SOIC-8, 0.150 inch, MS-012 |
| 安裝類型 | Surface mount |
| Memory Density | 2 kbits |
| Number of Memory Words | 2 k |
| RAM | 512 bytes |
| PWM Support | Supported |
| GPIO Functions | LED driving and interrupt functions |
| Sensing Functions | Configurable capacitive sensing buttons or GPIOs |
| Supplier Price | From 0.0493 USD |
CY8C20142-SX1I soic-8, 0.150 inch, ms-012 腳位配置指南
CY8C20142-SX1I（soic-8, 0.150 inch, ms-012 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： CY8C20142-SX1I.
請參閱 資料表 以查看完整腳位配置。
典型應用
CY8C20142-SX1I 適用於 6 應用s: Appliance Touch Control Panel, Industrial Equipment User Interface, Consumer Touch Button Interface, LED and Interrupt Control Interface, Low-Cost Capacitive Keypad, Connected Product Touch Interface.
Appliance Touch Control Panel
The CY8C20142-SX1I fits appliance control panels that need a small number of touch inputs without allocating a general-purpose MCU to capacitance measurement. Its four configurable channels can be assigned to capacitive buttons or GPIOs, while I2C communicates button and status information to the appliance controller. The verified 2.4 V to 5.5 V operating range supports common embedded supply rails. Designers should prototype the complete electrode and overlay stack because panel thickness, dielectric materials, hand proximity, and grounding can affect response more than the nominal controller specifications. Firmware should also confirm debounce, event reporting, and behavior during host reset.
推薦
Industrial Equipment User Interface
The CY8C20142-SX1I is suitable for industrial equipment that combines a few sealed or panel-mounted touch controls with a host processor. Four configurable I/Os provide touch-sensing or general-purpose signal functions, and the I2C interface allows the host to read events and coordinate indicator LEDs. Its verified -40°C to 85°C operating range covers many industrial environments. For reliable operation, the designer should evaluate noise immunity, electrode spacing, cable length, analog grounding, and behavior near high-energy switching equipment. Firmware should include diagnostic checks and a defined response if the host loses communication.
推薦
Consumer Touch Button Interface
For a compact consumer product, the CY8C20142-SX1I can provide a dedicated capacitive-touch input stage alongside an existing host controller. The four configurable channels reduce the need for repeated capacitance-scanning code in the host, while I2C provides a straightforward command and event path. Its 2.4 V to 5.5 V operating range is suitable for systems using 3.3 V or 5 V rails. Design work should focus on the intended touch experience, including sensitivity, false-trigger resistance, debounce behavior, and the influence of the enclosure. Mechanical samples should be tested with the production PCB, overlay, and firmware.
推薦
LED and Interrupt Control Interface
The CY8C20142-SX1I can also serve as a mixed input and output interface because its four I/O resources may be configured as GPIOs for driving LEDs or generating interrupt-related signals. This flexibility allows a small number of touch inputs and local indicators to share a controlled interface rather than expanding the host MCU's pin count. The I2C connection supports centralized configuration and monitoring over a 2.4 V to 5.5 V supply. Firmware should establish safe default states for all GPIOs at startup and define what happens if I2C communication is interrupted. LED current limits and any inductive or high-voltage loads should be checked against external driver requirements.
推薦
Low-Cost Capacitive Keypad
The CY8C20142-SX1I can support a low-cost capacitive keypad or function-key group when four touch channels are sufficient. Because the controller is purpose-built for CapSense Express operation, the host can focus on product behavior instead of implementing analog capacitance measurement. The device communicates through I2C and operates from 2.4 V to 5.5 V, simplifying integration with common embedded supply rails. Layout and firmware should be validated together: long sensing traces can increase susceptibility to noise, while overly sensitive settings may cause adjacent-key or enclosure-trigger issues. Production testing should include worst-case humidity, supply variation, and human-contact conditions.
推薦
Connected Product Touch Interface
The CY8C20142-SX1I can provide a local touch interface for a connected product whose host processor handles networking, display processing, or application logic. The controller's four configurable I/Os and I2C interface separate touch acquisition from the main processing task, reducing real-time input workload on the host. The 8-pin SOIC package is practical for compact boards, and the 2.4 V to 5.5 V operating range supports common system rails. Integration should include a defined I2C address strategy, pull-up implementation, firmware update policy, and fail-safe behavior during communication loss. Electromagnetic and enclosure testing should be repeated after every board-layout change.
推薦
推薦產品摘要
工程參考資料，適用於 CY8C20142-SX1I — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | CY8C20111-SX1I | CY8C20121-SX1I |
|---|---|---|---|
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies |
| Package | SOIC-8 | SOP-8 | SOP-8 |
| Product Type | CAPSENSE Express controller | Related capacitive-touch controller | Related capacitive-touch controller |
主要差異化特點
- Documented four-channel configurable interface (對比CY8C20111-SX1I)
- Wide supply-voltage operation (對比CY8C20121-SX1I)
- Specified industrial temperature range (對比CY8C20111-SX1I)
設計說明
Treat the sensing electrodes, routing, ground reference, and enclosure as one analog design. Keep each sensing connection as short and direct as practical, avoid routing beneath switching nodes or high-current paths, and maintain a stable ground reference. Because CY8C20142-SX1I is a capacitive-touch controller, changes to PCB stackup, solder mask, panel adhesive, or overlay material can change sensitivity. Validate the layout with the intended electrode geometry and enclosure rather than relying only on schematic simulation.
Provide a stable supply within the verified 2.4 V to 5.5 V operating range and place local supply bypassing close to the device pins. The verified source material does not specify capacitor values, current limits, or power dissipation, so those values must be obtained from the manufacturer datasheet before release. Firmware should also define the state of all four configurable I/Os during reset and power loss to prevent unintended touch events or LED states.
Do not treat a matching SOP-8 footprint as proof that a related part is a drop-in replacement. CY8C20111-SX1I and CY8C20121-SX1I remain candidates for review, but pin assignment, I2C address behavior, channel count, sensing configuration, register compatibility, and firmware must be verified before substitution. CY8C21234-24SXI was not included because its package does not match the target's SOIC-8 footprint.
合規資訊
The supplied manufacturer and distributor results do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. The -40°C to 85°C operating range must not be interpreted as evidence of automotive qualification.