Infineon Technologies CY8C20436A-24LQXI

Overview

CY8C20436A-24LQXI 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 generate 23 kHz PWM output and 5 ms haptic update intervals, operates at up to 3.3 V, and supports 14 Immersion TouchSense 2000 haptic effects for CapSense® button systems in portable consumer electronics.

For engineers reviewing the CY8C20436A-24LQXI datasheet, CY8C20436A-24LQXI pinout, CY8C20436A-24LQXI application, or CY8C20436A-24LQXI equivalent, key selection criteria include confirmed 23 kHz PWM frequency, 5 ms effect update timing, dual-timer resource allocation, actuator drive interface requirements (PWM and SHDN#), and flash/RAM usage dependency on enabled effects (43–1803 bytes RAM, 15922 bytes flash).

Technical Context

The CY8C20436A-24LQXI implements haptic feedback using firmware-driven timing: Timer_PWM generates ~23 kHz PWM via ISR (~90 clock cycles at 24 MHz IMO), while Timer_TMR triggers haptic effect updates every 5 ms. Both timers are dedicated and non-reconfigurable in this TS2000 configuration.

No hardware digital blocks are consumed-unlike CY8C22x45H variants-making it suitable for resource-constrained PSoC 1 designs where digital block count is limited. CPU load is active only during effect playback, with no background overhead when idle.

Key Specifications

Pinout & Package

LQFP-24 package (7 × 7 mm, 0.4 mm pitch) with 20 I/O pins. Dedicated TS2000 interface requires two user-configurable GPIOs: one for PWM output (e.g., P0[0]–P0[7], P1[2]–P1[7], P2[0]–P2[3]), and one for amplifier enable (SHDN#) signal.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C20436A-24LQXI, CY8C22345H offers lower CPU overhead at the cost of digital block usage, while CY8C20446H adds native CapSense hardware-enabling tighter sensor-feedback integration but with higher flash footprint (16210 bytes vs. 15922 bytes).

Availability

CY8C20436A-24LQXI is available at Aetrix Electronics and suitable for smartphone UI feedback, wearable device interaction, industrial handheld scanners, and medical patient monitors requiring stable component supply and long-term lifecycle support.

Supply support for CY8C20436A-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, with focus on low-power, high-integration solutions for human interface and sensing applications.

The CY8C20xx6A series delivers PSoC 1-based capacitive sensing and haptics control in compact packages, targeting cost-sensitive, battery-operated consumer and industrial touch interfaces where MCU offload and deterministic timing are critical.

FAQ

What is the minimum supported IMO clock frequency for reliable TS2000 operation on CY8C20436A-24LQXI?

The documented minimum IMO clock is 24 MHz. Lower frequencies cause deviation in the 5 ms haptic update interval and reduce PWM frequency below 22 kHz, risking audible noise and inconsistent effect playback. The TS2000_1.inc file defines TS2000_1_ISR_DUR assuming 24 MHz timing; altering clock speed requires manual ISR duration recalculation and validation against Immersion's waveform timing specs.

Can CY8C20436A-24LQXI drive an ERM actuator directly without an external amplifier?

No. The GPIO pins cannot source sufficient current (≥150 mA peak) or withstand back-EMF from ERM motors. The design requires the TPA6205A Class-D amplifier (or equivalent) between the PWM output pin and actuator. Direct connection risks GPIO damage, inconsistent vibration amplitude, and failure to meet Immersion TouchSense 2000 waveform fidelity requirements.

How does disabling unused haptic effects impact memory usage on CY8C20436A-24LQXI?

Each enabled effect increases flash usage by ~200–400 bytes and RAM by 15–45 bytes depending on complexity. Disabling all but one effect (e.g., Strong Click) reduces worst-case RAM from 1803 bytes to ~43 bytes and flash from 15922 bytes to ~12500 bytes. This optimization is performed at compile time and requires regenerating the PSoC Designer project after wizard reconfiguration.

Is the SHDN# signal on CY8C20436A-24LQXI internally debounced or latched?

No. The AmplifierEnable_Pin is a standard GPIO configured as open-drain or push-pull output per user code. Debouncing must be implemented in firmware if mechanical switch inputs drive the enable logic, or via RC filter (10 kΩ + 100 nF) on the PCB if driven from another digital source. The TS2000 module itself does not modify or condition this signal-it passes through as written by TS2000_EnableAmplifier() or direct port register write.