Infineon Technologies CY8C20160-SX2I

Overview

CY8C20160-SX2I from Cypress Semiconductor is a 6-button capacitive touch controller with integrated LED drive capability, configurable via I²C interface and nonvolatile memory. It operates across 2.4–2.9 V, 3.1–3.6 V, or 4.75–5.25 V supply rails, delivers 1.5 mA active current and 4 µA deep-sleep current, and supports robust RF/AC noise immunity for embedded human-interface applications.

For engineers reviewing the CY8C20160-SX2I datasheet, CY8C20160-SX2I pinout, CY8C20160-SX2I application, or CY8C20160-SX2I equivalent, key selection criteria include its 6-capacitive-input configuration, I²C-address programmability without external strapping, GPIO-based LED dimming with 15 duty cycles, and factory-tuned sensing algorithm enabling reliable operation on curved or flexible PCBs without shielding.

Technical Context

The device integrates a dedicated capacitive sensing core with adaptive baseline tracking and digital filtering to maintain >5:1 SNR across temperature and voltage variations. Its I²C interface supports up to 400 kbps data rate with clock stretching and fully configurable 7-bit addressing - no external pull-ups required due to internal resistor option.

All 10 GPIOs (GP0[0]–GP0[4], GP1[0]–GP1[4]) are software-mapped to CapSense inputs or LED drive outputs; GP1[1] and GP1[2] are excluded from LED use due to factory power-up behavior. Nonvolatile register storage enables automatic boot-time configuration without host intervention.

Key Specifications

Pinout & Package

Package: 16-pin QFN (3 × 3 × 0.6 mm, no e-pad) and 16-pin SOIC (150 mil). Pin functions validated per Cypress Document 001-54606 Rev. *N.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT42QT2120-MAHR and TTP223B-BA6, CY8C20160-SX2I provides superior flexibility through I²C reconfiguration, integrated LED drive, and factory-tuned noise rejection - making it optimal for multi-function industrial and display interfaces requiring field-upgradable behavior.

Availability

CY8C20160-SX2I is available at Aetrix Electronics and suitable for printer control panels, LCD monitor touch interfaces, and portable media player UIs requiring stable component supply across extended product lifecycles.

Supply support for CY8C20160-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

Cypress Semiconductor (now part of Infineon Technologies) designs high-performance mixed-signal ICs for embedded systems, with expertise in programmable analog/digital architectures and human-interface solutions.

CY8C20160 belongs to the CapSense Express™ family - engineered specifically for rapid integration of robust, low-power capacitive touch into cost-sensitive consumer and industrial displays without firmware development.

FAQ

What is the maximum number of capacitive buttons supported by CY8C20160-SX2I?

CY8C20160-SX2I supports exactly six capacitive touch inputs. This is fixed by silicon configuration - not software-configurable beyond six. The device shares pin resources with GPIO and LED drive functions, so all six buttons must be assigned from the available GP0/GP1 bank, and unused pins may be repurposed for output or left unconnected.

Does CY8C20160-SX2I require an external crystal or resonator?

No. CY8C20160-SX2I uses an internal precision oscillator for both CapSense timing and I²C clock generation. No external timing components are needed for basic operation. The internal oscillator is factory-trimmed to ±2% accuracy over temperature and voltage, sufficient for touch response consistency and I²C timing compliance up to 400 kbps.

Can GP1[1] and GP1[2] be used for general-purpose I/O?

Yes, but only as CapSense inputs - not for LED drive or high-current outputs. These pins execute factory test sequences during power-up, causing visible LED blink if driven directly. For reliable operation, Cypress explicitly advises against connecting LEDs or load-switching circuits to GP1[1] or GP1[2]; they remain functional for touch sensing or low-drive digital I/O.

How is the I²C address configured without external hardware?

The I²C address is stored in nonvolatile memory and programmed via I²C write to the I2C_ADDR register (address 0x00). Default factory address is 0x24, but users can assign any valid 7-bit address (0x10–0x7E) during configuration. No pull-up/pull-down resistors or strapping pins are required - full address flexibility is achieved in-system using standard I²C commands.