Infineon Technologies CY8CTST200A-32LQXIT

Overview

CY8CTST200A-32LQXIT from Cypress Semiconductor is a capacitive touch-sensing PSoC (Programmable System-on-Chip) IC integrating an M8C 8-bit CPU core, TrueTouch analog front-end, I²C slave interface, and programmable digital logic. It features 16KB flash, 2KB SRAM, up to 24 GPIOs (including 12 analog-capable), and operates from 2.4–5.25V. Used in consumer electronics for button/slider/wheel replacement in battery-powered handheld devices.

For engineers reviewing the CY8CTST200A-32LQXIT datasheet, CY8CTST200A-32LQXIT pinout, CY8CTST200A-32LQXIT application, or CY8CTST200A-32LQXIT equivalent, key selection criteria include integrated TrueTouch sensing accuracy, low-power sleep current (<1 µA), I²C address configurability, and factory-calibrated baseline tracking-critical for robust touch performance in noisy, variable-temperature environments.

Technical Context

This device implements Cypress's TrueTouch architecture with dedicated analog signal chain: 12-channel analog multiplexer, rail-to-rail comparators with hysteresis, and programmable charge-transfer measurement engine. Sensing resolution supports <1 pF capacitance change detection with auto-tuning of reference current and integration time per channel.

The M8C CPU runs at up to 24 MHz with hardware-accelerated touch scanning firmware in SROM, enabling sub-100 ms full-panel scan cycles. Digital resources include four 8-bit programmable timers, SPI/I²C/USB interfaces, and configurable digital blocks for debounce, filtering, or protocol bridging-enabling single-chip touch + system control.

Key Specifications

Pinout & Package

32-pin QFN (5 mm × 5 mm, 0.5 mm pitch), thermally enhanced exposed pad. Pin mapping validated per TRM Section 1.1.3 (CY8CTST200A-32LQXI pinout).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT42QT2120-MAHR and STM32F070CBT6, CY8CTST200A-32LQXIT delivers lowest system-level integration for fixed-function touch, minimizing host dependency and qualification effort-ideal for cost-sensitive, high-volume consumer products where time-to-market and supply stability are critical.

Availability

CY8CTST200A-32LQXIT is available at Aetrix Electronics and suitable for remote controls, medical handhelds, smart thermostats, and industrial HMIs requiring stable component supply across multi-year production cycles.

Supply support for CY8CTST200A-32LQXIT 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 focus on reliability and integration.

CY8CTST200A belongs to the TrueTouch PSoC family, engineered specifically for single-chip capacitive touch solutions in space-constrained, low-power, and EMI-challenged environments.

FAQ

Does CY8CTST200A-32LQXIT support mutual capacitance sensing?

Yes. The device supports both self-capacitance and mutual-capacitance measurement modes via its programmable analog routing and dedicated charge-transfer engine. Mutual-capacitance configuration enables true multi-touch detection and improved noise immunity in high-interference environments, with up to 6 × 6 matrix support using Port 0 and Port 1 pins.

What is the maximum recommended PCB trace length for touch sensor electrodes?

For optimal signal integrity and noise immunity, Cypress specifies ≤10 cm total trace length per electrode, with impedance-controlled routing (50 Ω characteristic) and guard traces grounded between adjacent sensors. Longer traces require recalibration and may reduce dynamic range below 0.5 pF resolution.

Can the I²C address be changed dynamically during operation?

No. The I²C slave address is set at power-on by the ADDR pin voltage level (low/mid/high) and locked until next reset. It cannot be modified via software or runtime register writes. Address selection is hardware-strapped only, supporting three fixed values: 0x2A, 0x2B, or 0x2C.

Is USB functionality available on CY8CTST200A-32LQXIT?

No. Although the TRM references "Full-Speed USB" in Section 20, that capability applies only to higher-pin-count variants (e.g., CY8CTMG201A-48LTXI). The CY8CTST200A-32LQXIT package omits USB PHY pins and associated routing; only I²C and SPI interfaces are implemented and supported.