Infineon Technologies CY8C20336AN-24LQXIT

Overview

CY8C20336AN-24LQXIT from Cypress Semiconductor is a programmable 1.8 V CapSense® controller with SmartSense™ auto-tuning, integrating an M8C 8-bit Harvard-architecture CPU (24 MHz max), 32 KB flash, 2 KB SRAM, and dedicated hardware for capacitive sensing of up to 33 buttons or 6 sliders. It operates from 1.71 V to 5.5 V, draws 28 µA/sensor in active scan mode (125 ms interval), and supports full-speed USB 2.0 (12 Mbps) - deployed in human interface modules for consumer appliances and industrial HMI panels.

For engineers reviewing the CY8C20336AN-24LQXIT datasheet, CY8C20336AN-24LQXIT pinout, CY8C20336AN-24LQXIT application, or CY8C20336AN-24LQXIT equivalent, key selection criteria include SmartSense_EMC noise immunity, configurable GPIO sink capability (25 mA per pin), integrated 10-bit ADC with internal reference, and QFN-48 package compatibility with 33-sensor layouts.

Technical Context

The device implements a dedicated CapSense analog block with patented CSA_EMC and CSD sensing algorithms, coupled with real-time SmartSense_EMC auto-tuning that dynamically adjusts sensor thresholds and IDAC settings to maintain stable performance across temperature, humidity, and overlay material variation. Its analog mux bus enables ganged proximity sensing by routing multiple sensors to shared comparators and reference buffers.

It features four clock sources - 6/12/24 MHz IMO, 32 kHz ILO, external 32 kHz crystal, and external clock input - enabling precise timing control for low-power wake-up intervals and USB synchronization. The internal LDO provides high PSRR for analog subsystem stability under noisy supply conditions.

Key Specifications

Pinout & Package

Package: 48-pin QFN (7 mm × 7 mm, 0.5 mm pitch), thermally enhanced with exposed pad - optimized for high-density HMI PCB layouts and thermal dissipation during sustained scanning.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C20236A-24LQXIT and CY8C20436A-24LQXIT, the CY8C20336AN-24LQXIT uniquely balances full USB HID integration, 33-sensor capacity, and SmartSense_EMC noise immunity - making it optimal for production-ready touch UIs needing zero-tuning deployment and direct PC/host reporting.

Availability

CY8C20336AN-24LQXIT is available at Aetrix Electronics and suitable for home appliance control panels, industrial HMI keypads, and medical device touch interfaces requiring stable component supply, long-term lifecycle support, and consistent SmartSense calibration behavior across manufacturing lots.

Supply support for CY8C20336AN-24LQXIT 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 - headquartered in San Jose, CA, with global manufacturing and support infrastructure.

This device belongs to the PSoC® CY8C20xx6A family, engineered specifically for self-contained capacitive touch interfaces that eliminate manual tuning, reduce BOM count, and accelerate time-to-market for certified HMI products.

FAQ

Does CY8C20336AN-24LQXIT require external tuning components for CapSense operation?

No. The device integrates SmartSense™ auto-tuning with patented CSA_EMC and CSD algorithms that dynamically adjust IDAC values, scan resolution, and baseline tracking in real time. No external resistors, capacitors, or factory calibration fixtures are needed - sensor layout and overlay thickness are the only mechanical dependencies.

Can CY8C20336AN-24LQXIT operate without an external crystal?

Yes. It includes an internal 32 kHz ILO for sleep/wake timers and a 6/12/24 MHz IMO for CPU and CapSense clocking. An external 32 kHz crystal is optional and only required for applications demanding tighter timing accuracy in deep-sleep wake-up intervals or USB suspend/resume timing compliance.

What is the maximum number of simultaneous CapSense buttons supported in QFN-48 package?

The CY8C20336AN-24LQXIT in QFN-48 supports up to 33 capacitive sensing inputs - confirmed in Cypress datasheet 001-54459 Rev. *Y, page 17 (48-pin QFN with 33 Sensing Inputs). All 33 pins are assignable as buttons or grouped into sliders using the on-chip analog mux and SmartSense configuration.

Is USB functionality available out-of-the-box or does it require firmware development?

USB HID class functionality is pre-integrated in Cypress's CapSense Component library within PSoC Designer™. Engineers configure USB descriptors and report mapping graphically; no low-level USB stack coding is required. Firmware generation produces fully compliant HID reports for buttons, sliders, and proximity events upon enumeration.