Texas Instruments TSC2200IPWR

Overview

TSC2200IPWR from Texas Instruments is a complete PDA analog interface IC integrating 4-wire resistive touch screen controller, 4×4 keypad scanner, 8-/10-/12-bit SAR ADC, on-chip temperature sensor (±2°C accuracy, 0.3°C resolution), dual battery monitor (0.5V–6V range, ±3% accuracy), and 8-bit current-output DAC for LCD contrast control. It operates from a single 2.7V–3.6V supply and interfaces via SPI to host microprocessors in handheld human-interface systems.

For engineers reviewing the TSC2200IPWR datasheet, TSC2200IPWR pinout, TSC2200IPWR application, or TSC2200IPWR equivalent, this device delivers ratiometric touch position (X/Y) and pressure (Z) measurement, programmable sampling rates up to 125kHz, internal 2.5V/1.25V references, and integrated PENIRQ/KBIRQ interrupt generation - all in a space-constrained TSSOP-28 package suitable for portable electronics design.

Technical Context

The TSC2200IPWR implements a register-based SPI-controlled architecture with two independent interrupt outputs (PENIRQ and KBIRQ) tied to dedicated state machines for autonomous touch detection and keypad scanning. Its SAR ADC uses capacitive redistribution with built-in sample-and-hold and supports differential (touch) and single-ended (battery, AUX, temperature) input modes.

Internal 8MHz oscillator feeds programmable clock dividers to support 8-/10-/12-bit conversions at optimized speed-power trade-offs; conversion timing includes configurable panel voltage stabilization delay to accommodate mechanical settling of ITO layers. The DAC output current (650µA typ.) is set by external ARNG resistor and used directly for analog LCD bias control.

Key Specifications

Pinout & Package

TSC2200IPWR is packaged in a 28-pin TSSOP (PW) with 0.65mm pitch, 9.7mm × 4.4mm body size, and exposed pad for thermal dissipation. Pin functions are validated per TI SBAS191F datasheet Rev. April 2004.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog interface applications.

Compared with TSC2200IPWR, both alternatives require additional ICs to replicate its full PDA analog interface capability - TSC2003IPW omits keypad and DAC, while AD7873ARUZ provides touch-only functionality. Only TSC2200IPWR integrates touch, keypad, battery, temperature, and LCD control in one TSSOP-28 package.

Availability

TSC2200IPWR is available at Aetrix Electronics and suitable for personal digital assistants, cellular phones, and MP3 players requiring stable component supply across extended product lifecycles.

Supply support for TSC2200IPWR 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

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and consumer markets.

The TSC2200 family was designed specifically as an integrated analog front-end for portable human-interface devices, consolidating touch, keypad, power monitoring, thermal sensing, and display control functions into a single SPI-managed IC.

FAQ

What is the primary function of the TSC2200IPWR in a portable electronic system?

The TSC2200IPWR serves as a complete analog interface IC for handheld devices, integrating 4-wire resistive touch screen control, 4×4 keypad scanning, 8-/10-/12-bit ADC, dual battery monitoring (0.5V–6V), on-chip temperature sensing, and an 8-bit current-output DAC for LCD contrast. It replaces multiple discrete components in PDAs, smartphones, and MP3 players, reducing board space and firmware complexity while maintaining high accuracy across operating conditions.

Does the TSC2200IPWR support true ratiometric touch conversion, and how is it implemented?

Yes, the TSC2200IPWR implements true ratiometric conversion for touch position measurements. It applies excitation voltage across one resistive axis (e.g., Y+–Y–) and measures the divided voltage on the orthogonal axis (e.g., X+) using differential inputs - making the result independent of absolute reference voltage or supply variations. This architecture ensures stable X/Y coordinate accuracy even with ±10% VDD drift or reference tolerance, as confirmed in the SBAS191F datasheet's electrical characteristics table.

How does the TSC2200IPWR generate the PENIRQ signal, and what is its timing behavior?

The TSC2200IPWR generates PENIRQ by enabling a 50kΩ pull-up from X+ to VDD and connecting Y– to GND during power-down mode. When the touch screen is pressed, X+ is shorted to GND through the ITO layers, pulling PENIRQ low to signal touch detection. The datasheet specifies that this occurs with <10µs latency after contact, and the signal remains asserted until the host reads the touch data or disables the interrupt - ensuring reliable wake-up for low-power portable systems using TSC2200IPWR.

Can the TSC2200IPWR measure touch pressure (Z-axis), and what resolution is supported?

Yes, the TSC2200IPWR supports touch pressure measurement using two methods described in the SBAS191F datasheet: Z1/Z2 cross-panel resistance calculation or X/Y-plate resistance-based computation. It leverages the same SAR ADC used for position sensing, supporting 8-bit resolution for fast Z-sampling (recommended for pressure) or full 12-bit resolution for higher precision. The device provides dedicated Z1 and Z2 result registers (addresses 02h and 03h in Page 0) and requires no external components beyond the standard 4-wire touch panel to execute either method.

What are the key differences between the TSC2200IPWR and the TSC2200IRHBR package variants?

The TSC2200IPWR uses a 28-pin TSSOP package (PW), while TSC2200IRHBR uses a 32-pin QFN (RHB). Both share identical electrical specifications, register maps, and functional capabilities per SBAS191F. Key differences include pin count (28 vs. 32), footprint size (9.7mm × 4.4mm vs. 5mm × 5mm), thermal performance (θ_JA = 90°C/W for TSSOP vs. ~45°C/W for QFN), and lead count (exposed pad in QFN improves heat dissipation). TSC2200IPWR is optimized for legacy TSSOP assembly lines; TSC2200IRHBR suits space-constrained, thermally demanding designs.