Cypress Semiconductor Corp CY8C20140-SX2I

Overview

CY8C20140-SX2I from Infineon is a capacitive touch-sensing microcontroller based on the PSoC™ 1 architecture, integrating an 8-bit M8C core, on-chip CapSense® analog block, and programmable digital logic. It supports up to 14 self-capacitive or 8 mutual-capacitive sensors, operates from 2.4–5.25 V, and features 8 KB flash, 512 B SRAM, and a 12-bit SAR ADC. It is used in consumer appliance control panels requiring robust, low-power touch interfaces.

For engineers reviewing the CY8C20140-SX2I datasheet, CY8C20140-SX2I pinout, CY8C20140-SX2I application, or CY8C20140-SX2I equivalent, key selection criteria include CapSense® sensor count and configuration flexibility, supply voltage range compatibility, embedded flash retention at industrial temperature, and I²C/SMBus interface support for host communication.

Technical Context

The CY8C20140-SX2I implements a dedicated CapSense® CSD (Capacitive Sigma-Delta) sensing engine that performs continuous baseline tracking and noise rejection without CPU intervention. Its M8C core runs at up to 24 MHz and supports interrupt-driven sensor scanning with configurable scan resolution (6–16 bits) and scan speed (up to 100 kHz).

It includes hardware-accelerated digital functions such as PWM generators, timers, and I²C master/slave controllers, enabling full system integration without external components. The device uses a single-supply rail and supports deep-sleep modes with current draw as low as 1.5 µA while maintaining CapSense® wake-on-touch capability.

Key Specifications

Pinout & Package

Package: 16-pin SOIC (SO-16), 3.9 mm × 9.9 mm, 1.27 mm pitch - surface-mount compatible with standard reflow profiles and automated assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar capacitive touch controller applications.

Compared with CY8C20240-SX2I, this part trades flash/SRAM headroom for smaller footprint and lower unit cost; versus ATtiny412-MFR, it delivers superior noise immunity, lower power in active sensing, and deterministic scan timing without firmware overhead.

Availability

CY8C20140-SX2I is available at Aetrix Electronics and suitable for home appliance control panels, industrial HMIs, smart thermostats, and medical device overlays requiring stable component supply and long-term manufacturability.

Supply support for CY8C20140-SX2I includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive ICs, and embedded security solutions, with global manufacturing and R&D infrastructure.

This device belongs to the legacy PSoC™ 1 family, designed specifically for highly integrated, low-cost capacitive touch and mixed-signal control in cost-sensitive consumer and industrial applications.

FAQ

What is the maximum number of simultaneous touch keys supported by CY8C20140-SX2I?

The CY8C20140-SX2I supports up to 14 self-capacitive keys or 8 mutual-capacitive keys simultaneously. This is determined by its fixed CapSense® CSD block resource allocation and pin mapping - not firmware-limited. Mutual-cap configurations require paired CTx/CTy pins and reduce total channel count due to routing constraints.

Does CY8C20140-SX2I require an external crystal for operation?

No, the CY8C20140-SX2I can operate using its internal IMO (Internal Main Oscillator) at 24 MHz for most CapSense® applications. An external crystal (1–24 MHz) is optional and only required when precise timing stability beyond ±1% is needed, such as for synchronous I²C slave operation or calibrated ADC measurements.

Can CY8C20140-SX2I drive LEDs directly without external transistors?

Yes, its IO[0]–IO[5] pins support up to 20 mA sink or source per pin, enabling direct LED driving with appropriate current-limiting resistors. However, simultaneous full-current operation on multiple pins may exceed total package thermal limits - design validation per JEDEC JESD51-2 is recommended for sustained 20 mA loads.

Is there a migration path from CY8C20140-SX2I to newer PSoC™ generations?

Infineon provides migration guidance from PSoC™ 1 to PSOC™ 4 (e.g., CY8C4014LQI-SX2I), which offers ARM Cortex-M0+, enhanced CapSense® with proximity and gesture support, and extended temperature range. Pin compatibility is not maintained, but CapSense® configuration tools and API abstraction layers simplify firmware porting.