XPT2046 Touch Screen Controller IC TSSOP-16

XPT2046 Touch Screen Controller IC TSSOP-16 is a highly efficient, 4-wire resistive touch screen controller that incorporates a successive-approximation register (SAR) A/D converter. This specialized chip operates as the primary interface between a microcontroller and a resistive touch panel, translating physical touch pressure into precise digital coordinates. Consequently, it enables smooth and responsive user interaction on digital displays. The device also features an on-chip temperature sensor and auxiliary analog inputs, which dramatically reduces overall component count on your PCB. Furthermore, its low power consumption makes it perfect for portable, battery-operated devices. Therefore, you should select this industry-standard controller to add robust touch capabilities to your next embedded display project.

Key Features:

• High Coordinate Resolution: Provides 12-bit resolution for the A/D converter, ensuring precise tracking and smooth touch detection across the panel.
• SPI Serial Interface: Communicates via a standard synchronous serial interface, which allows simple connection to hardware SPI ports on almost any host microcontroller.
• Integrated Auxiliary Inputs: Includes extra measurement channels for battery voltage monitoring and temperature sensing, optimizing system design efficiency.
• Low Power Architecture: Employs an automatic power-down feature between conversions, which significantly lowers power consumption during idle periods.
• Wide Supply Range: Operates reliably down to low voltage levels, making the chip fully compatible with both 3.3V and 5V logic systems.

Technical Specifications:

• Operating Voltage Range: 2.7 V to 5.25 V
• A/D Converter Resolution: 12-Bit
• Throughput Rate: Up to 125 kHz (at 5V)
• Interface Protocol: 3-Wire or 4-Wire SPI Serial Interface
• Reference Voltage (Internal): 2.5 V
• Power Consumption (Active): ≈ 750 μA (at 125 kHz, 3V)
• Power Consumption (Power-Down): ≤ 1 μA

Mechanical Specifications:

• Package Type: TSSOP-16 (Thin Shrink Small Outline Package)
• Pin Count: 16-Pin
• Mounting Type: Surface Mount Technology (SMT)
• Lead Finish: Matte Tin / Lead-Free Compliant

Dimensions:

• Body Length: ≈ 5.0 mm
• Body Width: ≈ 4.4 mm
• Total Pitch (Lead to Lead): 0.65 mm
• Overall Thickness: ≤ 1.2 mm

Pinout and Wiring:

• Pin 1 (VCC): Connect to the positive power supply rail (2.7V to 5.25V).
• Pin 2 (X+): Connect to the X+ electrode of the 4-wire resistive touch panel.
• Pin 3 (Y+): Connect to the Y+ electrode of the 4-wire resistive touch panel.
• Pin 4 (X-): Connect to the X- electrode of the 4-wire resistive touch panel.
• Pin 5 (Y-): Connect to the Y- electrode of the 4-wire resistive touch panel.
• Pin 6 (GND): Connect to the main circuit ground reference.
• Pin 11 (PENIRQ): Pen Interrupt Output. Connect to an MCU interrupt pin to detect panel touches automatically.
• Pins 12, 13, 14, 15 (DOUT, BUSY, DIN, CS): Connect these pins directly to the host microcontroller’s SPI bus lines.

Datasheet Reference:

• Download XPT2046 Touch Screen Controller Datasheet

Commonly Used in:

• TFT LCD Modules: Providing the built-in touch control layer for standard 2.4-inch, 2.8-inch, and 3.2-inch Arduino display shields.
• Smart Home Interfaces: Driving the resistive touch panel screens on wall switches and climate control consoles.
• Handheld Equipment: Managing user input interfaces on portable measurement instruments and field testers.

Applications:

• HMI Development: Establishing human-machine interfaces for embedded systems, machinery controllers, and interactive terminals.
• Point-of-Sale (POS) Systems: Processing touch selections on cost-sensitive retail terminal modules.
• Battery Level Diagnostics: Utilizing the auxiliary voltage inputs to monitor battery state while simultaneously managing touch inputs.

Equivalent Models:

• ADS7846 (Texas Instruments): A premium, drop-in replacement that shares identical pin layouts and SPI command structures.
• TSC2046 (Texas Instruments): An updated variant offering similar 12-bit SAR converter performance and pin compatibility.
• HR2046: A widely deployed second-source cross-reference alternative, however, engineers should confirm timing margins in high-speed SPI setups.

Package Includes:

• 1 x XPT2046 Touch Screen Controller IC TSSOP-16