Infineon Technologies CY8C20666AS-24LQXI

Overview

CY8C20666AS-24LQXI from Cypress Semiconductor is a PSoC® 1 mixed-signal array IC configured with the TS2000 Haptics User Module for tactile feedback generation. It implements Immersion TouchSense 2000 haptic effects using two dedicated 16-bit timers (Timer0 and Timer2), supports up to 14 programmable vibration effects, operates at 3.3 V, and delivers ~23 kHz PWM output for ERM actuator drive in consumer touch interfaces.

For engineers reviewing the CY8C20666AS-24LQXI datasheet, CY8C20666AS-24LQXI pinout, CY8C20666AS-24LQXI application, or CY8C20666AS-24LQXI equivalent, key selection criteria include its firmware-based 5-ms haptic update timing, dual-timer resource allocation, PWM output frequency stability above 22 kHz, actuator enable signal control via SHDN#, and flash/RAM usage dependency on enabled effects (43–1803 bytes RAM, 15922 bytes flash).

Technical Context

The CY8C20666AS-24LQXI implements haptic feedback entirely in firmware using two 16-bit timers: Timer_PWM generates a ~23 kHz PWM signal (FPWM = FClock / 255) with ~90-cycle ISR duration, while Timer_TMR provides precise 5-ms intervals (±10% tolerance) for effect sequencing. Both timers operate under IMO clocking at 24 MHz for optimal timing integrity.

No hardware digital blocks are consumed for haptics on this device - unlike CY8C22x45H variants - making it suitable for resource-constrained CapSense+Haptics designs where digital block count is limited. The module remains non-blocking: CPU execution continues during effect playback, and zero ISR overhead occurs when no effect is active.

Key Specifications

Pinout & Package

LQFP-24 (24-pin Low-Profile Quad Flat Package) with 0.4 mm pitch; exposed thermal pad optional per design. Pin assignment is user-configurable via PSoC Designer - no fixed hardware pinout. Critical configurable terminals include PWM_Port/PWM_Pin (drives actuator IN-), AmplifierEnable_Port/AmplifierEnable_Pin (controls SHDN#), and I²C pins (P1[0]/P1[1], reserved and not recommended for haptics signals).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C20666AS-24LQXI, CY8C22345H trades firmware efficiency for hardware offload and reduced ISR latency, while CY8C20346H adds sensor scalability at the cost of higher base flash usage (14652 bytes vs. 15922 bytes) and less predictable CPU loading across configurations.

Availability

CY8C20666AS-24LQXI is available at Aetrix Electronics and suitable for smartphone touch UI feedback, wearable fitness tracker buttons, and industrial HMI touch panels requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.

Supply support for CY8C20666AS-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 control, sensing, and connectivity applications with emphasis on integration, low power, and developer tools.

The CY8C20xx6A/H series targets cost-sensitive, small-footprint CapSense+Haptics systems - specifically enabling tactile feedback on capacitive interfaces without external controllers or dedicated haptics ICs.

FAQ

What is the minimum clock configuration required for stable TS2000 operation on CY8C20666AS-24LQXI?

The device requires an IMO clock of 24 MHz with VC1 divider set to 4, yielding FClock = 6 MHz. This satisfies both PWM frequency (>22 kHz) and 5-ms timer accuracy (EffectUpdateDivider = 117). Lower IMO frequencies or improper VC1 settings cause FPWM drop below specification or 5-ms drift exceeding ±10% tolerance.

Can CY8C20666AS-24LQXI drive linear resonant actuators (LRAs)?

No - the TS2000 User Module and associated drive circuitry (TPA6205A) are validated exclusively for eccentric rotating motors (ERMs) like the Sanyo NRS-2574i and Jinlong Z6DL2A017000B. LRA drive requires resonant frequency matching, AC voltage biasing, and phase control not supported by this firmware module or its reference schematic.

How does disabling unused haptic effects impact memory usage?

Disabling effects directly reduces flash consumption: each enabled effect adds ~300–600 bytes depending on complexity. Base RAM usage starts at 43 bytes (no effects) and increases incrementally - e.g., enabling Strong Click + Sharp Click 60% raises RAM to ~320 bytes. Flash reduction is irreversible per build; disabled effects cannot be re-enabled at runtime.

Is P1[0]/P1[1] usable for haptics PWM output on CY8C20666AS-24LQXI?

No - P1[0] and P1[1] are hardwired to I²C SDA/SCL functions in this device family and are explicitly prohibited for haptics signal routing per Cypress Design Guide. Using them causes I²C communication failure and undefined TS2000 behavior. Valid PWM pins include P0[0]–P0[7], P2[0]–P2[7], and P3[0]–P3[7] as assigned in PSoC Designer.