Infineon Technologies CY8C20646AS-24LQXI

Overview

CY8C20646AS-24LQXI from Cypress Semiconductor is a haptics-enabled CapSense® programmable mixed-signal controller featuring an M8C 8-bit Harvard-architecture CPU (up to 24 MHz), 16 KB flash/2 KB SRAM, integrated Immersion TS2000 ERM haptics driver, and configurable capacitive sensing for up to 28 GPIOs in a 24-pin QFN package. It operates from 1.71 V to 5.5 V across –40 °C to +85 °C and supports I²C slave (up to 400 kHz), SPI master/slave, three 16-bit timers, and precision analog resources including dual comparators and 8–10-bit incremental ADC - deployed in human-interface consumer electronics requiring robust touch + tactile feedback.

For engineers reviewing the CY8C20646AS-24LQXI datasheet, CY8C20646AS-24LQXI pinout, CY8C20646AS-24LQXI application, or CY8C20646AS-24LQXI equivalent, key selection criteria include its integrated haptics control logic, CapSense scan engine with SmartSense™ auto-tuning, 24-pin QFN footprint compatibility, 28-GPIO CapSense+analog mux capability, and I²C/SPI peripheral timing constraints in low-power embedded HMI designs.

Technical Context

The device integrates a dedicated CapSense analog block with hardware-accelerated scanning logic, supporting buttons, sliders, touchpads, and proximity sensors without external components. Its internal 1-V/1.2-V analog reference and high-PSRR analog mux enable stable capacitive measurements across varying overlay thicknesses and environmental noise.

Haptics control is implemented via an embedded Immersion TS2000 controller supporting up to 14 preloaded ERM effects and three selectable motor drive configurations. Clocking combines a ±5% 6/12/24 MHz IMO, 32-kHz ILO, and optional precision 32-kHz crystal oscillator - enabling synchronized CapSense acquisition and haptic actuation timing.

Key Specifications

Pinout & Package

Package: 24-pin 4 × 4 × 0.6 mm QFN (LQFP-style leadless, exposed thermal pad).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F072CBT6 and ATtiny1616-MFR, CY8C20646AS-24LQXI delivers turnkey CapSense + haptics functionality in one die, reducing design cycle time by eliminating external component selection, layout, and firmware co-optimization - critical for fast-to-market consumer HMI products.

Availability

CY8C20646AS-24LQXI is available at Aetrix Electronics and suitable for smartphone front panels, industrial control panels, wireless headset controls, and home appliance touch interfaces requiring stable component supply and long-term lifecycle support.

Supply support for CY8C20646AS-24LQXI 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 programmable mixed-signal ICs for embedded systems, emphasizing configurability, low-power operation, and system-level integration.

This device belongs to the PSoC® 2000 series - a family optimized for human-machine interface applications requiring tightly coupled capacitive sensing, analog signal conditioning, and real-time haptic feedback control.

FAQ

Does CY8C20646AS-24LQXI support mutual-capacitance touchscreens?

No. This device implements only self-capacitance sensing through its dedicated CapSense block. It supports buttons, sliders, touchpads, and proximity sensors but lacks the hardware architecture for mutual-capacitance matrix scanning required for full touchscreens.

What is the maximum number of CapSense electrodes supported in 24-pin QFN configuration?

The CY8C20646AS-24LQXI supports up to 28 capacitive sensing electrodes, constrained by GPIO availability and internal analog mux routing. All 24 pins are usable for CapSense, with dedicated CSCLK, CSIN, and CSD pins allocated in the internal CapSense block - verified in the Pinouts section of datasheet 001-56223 Rev. *E.

Can the Immersion TS2000 haptics controller drive linear resonant actuators (LRAs)?

No. The integrated TS2000 controller is specifically designed for eccentric rotating mass (ERM) motors only. It does not provide the high-voltage, phase-controlled drive signals required for LRA operation - confirmed in the Haptics TS2000 Controller section of the datasheet.

Is ISSP programming supported after soldering to PCB?

Yes. In-System Serial Programming (ISSP) is fully supported via dedicated PSoC programming pins (e.g., RESET, XRES, SCLK, SDATA). Field firmware updates are possible without removing the device, provided the PCB layout reserves access to these pins and meets the 500 ns setup/hold timing requirements per the ISSP specification.