Infineon Technologies CY8C20646A-24LTXI

Overview

CY8C20646A-24LTXI from Cypress Semiconductor is a PSoC® 1 mixed-signal array IC configured with the TS2000 Haptics User Module for tactile feedback generation. It integrates two 16-bit timers (Timer0 and Timer2) to produce ~23 kHz PWM output and 5-ms haptic update intervals, operates at up to 3.3 V, and supports up to 14 Immersion TouchSense 2000 haptic effects in embedded capacitive touch interfaces.

For engineers reviewing the CY8C20646A-24LTXI datasheet, CY8C20646A-24LTXI pinout, CY8C20646A-24LTXI application, or CY8C20646A-24LTXI equivalent, key selection criteria include timer resource allocation, PWM frequency stability (>22 kHz), 5-ms effect update timing tolerance (±10%), actuator drive interface (PWM + SHDN#), and flash/RAM usage trade-offs across enabled effects.

Technical Context

The CY8C20646A-24LTXI implements haptic feedback using firmware-driven dual-timer architecture: Timer_PWM generates ~23 kHz PWM output (FClock/255), while Timer_TMR triggers haptic updates every 5 ms (200 Hz ±10%). Both ISRs execute without blocking main firmware flow.

It requires precise clock configuration - FClock must be 5.6–13 MHz to ensure FPWM > 22 kHz and EffectUpdateDivider ∈ [109, 255]. CPU load is zero when no effect is playing; ISR duration is ~90 clock cycles at 24-MHz IMO.

Key Specifications

Pinout & Package

Package: 24-pin QFN (5 mm × 5 mm, 0.5 mm pitch), RoHS-compliant, lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C20646A-24LTXI, CY8C20666A-24LTXI trades timing determinism for resource efficiency, while CY8C22345H-24LTXI delivers superior real-time performance at the cost of higher silicon complexity and board-level redesign.

Availability

CY8C20646A-24LTXI is available at Aetrix Electronics and suitable for smartphone touch interfaces, industrial HMI panels, wearable fitness trackers, and medical patient monitor UIs requiring stable component supply and long-term lifecycle support.

Supply support for CY8C20646A-24LTXI 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 control, sensing, and connectivity applications.

The CY8C20xx6A series targets cost-sensitive, low-power capacitive touch systems requiring integrated haptics, with PSoC 1 architecture enabling firmware-defined analog/digital blocks and timer-based peripheral offload.

FAQ

What clock source and frequency are required for reliable TS2000 operation on CY8C20646A-24LTXI?

The device requires an internal main oscillator (IMO) set to 24 MHz, with VC1 divider configured to yield FClock between 5.6 MHz and 13 MHz. Example: VC1 = 4 → FClock = 6 MHz ensures FPWM = 23.5 kHz and EffectUpdateDivider = 117, meeting both PWM and 5-ms timing specs within ±10% tolerance.

Which pins are recommended for PWM output and amplifier shutdown signals?

P1[2]–P1[7] are recommended for PWM_Port/PWM_Pin and AmplifierEnable_Port/AmplifierEnable_Pin assignments. P1[0] and P1[1] must be avoided as they default to I²C functionality and conflict with TS2000 signal routing per Cypress design guidelines.

How does flash and RAM usage scale with enabled haptic effects?

Each enabled effect increases flash usage by ~300–800 bytes depending on waveform complexity and compiler optimization level; RAM scales linearly with active effect count, ranging from 43 bytes (no effect) to 1,803 bytes (all 14 effects enabled and buffered). Disabling unused effects directly reduces both memory footprints.

Can CY8C20646A-24LTXI drive both ERM and LRA actuators?

No - the TS2000 User Module and associated drive circuitry (TPA6205A amplifier) are validated exclusively for Eccentric Rotating Motor (ERM) actuators: Sanyo NRS-2574i (≤150 g devices) and Jinlong Z6DL2A017000B (>150 g devices). No LRA support or waveform tuning is provided in the Immersion TouchSense 2000 library.