Infineon Technologies CY8CTST200-24LQXIT

Overview

CY8CTST200-24LQXIT 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 24-pin QFN package, 8 KB flash, 512 B SRAM, and supports up to 16 self-capacitive or 8 mutual-capacitive touch sensors. It is deployed in consumer electronics human-interface applications requiring low-power, noise-immune touch control.

For engineers reviewing the CY8CTST200-24LQXIT datasheet, CY8CTST200-24LQXIT pinout, CY8CTST200-24LQXIT application, or CY8CTST200-24LQXIT equivalent, key selection criteria include its integrated TrueTouch module architecture, 24-pin LQFP-compatible footprint, I²C-based host communication, flash code protection capability, and support for both self- and mutual-capacitance sensing topologies.

Technical Context

The CY8CTST200-24LQXIT implements Cypress's TrueTouch system with dedicated analog comparators, I/O analog multiplexer, and configurable sigma-delta modulator for high-SNR capacitive sensing. Its M8C CPU core runs at up to 24 MHz and executes firmware from on-chip flash memory with hardware-assisted boot and block erase functions.

System-level resources include an internal main oscillator (IMO) at 24 MHz ±5%, internal low-speed oscillator (ILO) at 100 kHz, programmable digital clocks, and dual reset sources (POR and LVD). The device supports I²C slave mode only (no master capability) and lacks USB or SPI peripherals in this variant.

Key Specifications

Pinout & Package

Package: 24-pin QFN (5 mm × 5 mm, 0.5 mm pitch), exposed thermal pad, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8CTMA120-24LQXIT, this part lacks TX driver circuitry and advanced noise cancellation but offers identical footprint and lower BOM cost; versus AT42QT1070-MAHR, it provides full firmware programmability and double the channel count at the expense of higher design complexity.

Availability

CY8CTST200-24LQXIT is available at Aetrix Electronics and suitable for smartphone side keys, industrial HMI panels, home appliance rotary controls, and medical device UIs requiring stable component supply and long-term lifecycle assurance.

Supply support for CY8CTST200-24LQXIT 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 mixed-signal programmable SoCs for embedded control, sensing, and connectivity applications.

The CY8CTST200 series belongs to Cypress's TrueTouch product line, engineered specifically for high-reliability, low-power capacitive touch interfaces in consumer and industrial equipment.

FAQ

Does CY8CTST200-24LQXIT support mutual-capacitance sensing?

Yes, it supports mutual-capacitance sensing with up to 8 channels. The TrueTouch module includes dedicated TX and RX paths, and firmware libraries in PSoC Designer v5.x provide calibrated mutual-cap routines. Channel mapping and scan timing are fully configurable via register writes or API calls.

What is the maximum operating temperature for continuous operation?

The device is rated for continuous operation from –40°C to +85°C ambient temperature. Thermal performance is validated with 5 mm × 5 mm QFN package mounted on 2-layer FR-4 with 1-in² copper pour; derating is not required within this range per Cypress TRM Section 17.2.

Can the internal 24 MHz IMO be used as the I²C clock source?

No - the I²C peripheral derives timing exclusively from the internal low-speed oscillator (ILO) at 100 kHz. The IMO feeds the CPU and digital clocks but is not routed to the I²C block; bit-rate accuracy depends solely on ILO stability and external pull-up resistor tolerance.

Is there hardware support for touch button auto-calibration?

Yes, the Supervisory ROM (SROM) includes Calibrate0 and Calibrate1 functions that perform baseline initialization and drift compensation during power-up and runtime. These routines execute in <500 µs and require no host intervention, enabling maintenance-free touch operation over temperature and humidity shifts.