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Texas Instruments TSC2003IR
- Part No.:
- TSC2003IR
- Manufacturer:
- Texas Instruments
- Category:
- Touch Screen Controllers
- Package:
- -
- Datasheet:
-
TSC2003IR.pdf
- Description:
- IC SCREEN CNTRL 12BIT 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,998
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Product details
Overview
TSC2003IR from Texas Instruments is a 4-wire resistive touch screen controller IC with integrated 12-bit SAR ADC, on-chip 2.5V reference, dual battery monitoring (0.5V–6V), on-die temperature sensing, and touch-pressure calculation capability. It operates from 2.5V to 5.25V supply and supports I²C Standard/Fast/High-Speed modes up to 3.4 MHz for use in portable handheld UI subsystems.
For engineers reviewing the TSC2003IR datasheet, TSC2003IR pinout, TSC2003IR application, or TSC2003IR equivalent, key selection considerations include its differential ratiometric touch measurement architecture, PENIRQ open-drain interrupt signaling, dual auxiliary analog inputs (IN1/IN2), and support for both internal and external reference configurations in single-ended or differential modes.
Technical Context
The TSC2003IR implements a capacitive redistribution-based SAR ADC with built-in sample-and-hold, enabling simultaneous X/Y/Z coordinate acquisition and pressure computation. Its multiplexer routes touch panel signals (X+, X−, Y+, Y−), battery monitors (VBAT1/VBAT2), auxiliary inputs (IN1/IN2), and temperature diodes (TEMP0/TEMP1) to the converter core.
Differential reference mode uses switched Y+/Y− drivers as the A/D reference path-eliminating switch-on-resistance error in position measurement-while single-ended mode leverages the internal 2.5V reference or external VREF input for battery, temperature, and auxiliary channel digitization with ±3% accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC with no missing codes; 11-bit in Standard/Fast I²C mode; 10-bit in High-Speed mode |
| Supply Range | 2.5V to 5.25V operation; specified performance from 2.7V to 3.6V |
| I²C Support | Standard (100 kHz), Fast (400 kHz), and High-Speed (up to 3.4 MHz) modes with programmable address (A0/A1) |
| Touch Interface | 4-wire resistive touch panel controller with PENIRQ interrupt output and Z1/Z2 pressure measurement support |
| Battery Monitoring | Two independent inputs (VBAT1/VBAT2) measuring 0.5V–6.0V via internal 4:1 resistor divider; ±3% accuracy using internal reference |
| Temperature Sensing | Dual diode-based measurement: TEMP0 (±3°C absolute, 0.3°C/LSB) and differential TEMP0/TEMP1 (±2°C, 1.6°C/LSB) |
| Reference Options | Internal 2.45–2.55V bandgap reference (25 ppm/°C drift); external VREF input range 2.0V to VDD |
Pinout & Package
TSC2003IR is packaged in TSSOP-16 (PW) with exposed thermal pad; pinout validated per TI SBAS162G datasheet Rev G (June 2007).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VDD | Power Supply Input | Main analog/digital supply rail (2.5V–5.25V); powers internal reference, ADC, and logic |
| X+, X−, Y+, Y− | Touch Panel Interface | Direct connection to 4-wire resistive overlay; low RON switches (5.5Ω/7.3Ω) enable precise ratiometric position sampling |
| PENIRQ | Open-Drain Interrupt Output | Active-low pen-down detection signal requiring external 30kΩ–100kΩ pull-up; asserts on touch initiation |
| SDA / SCL | I²C Serial Data/Clock | Compliant with Standard/Fast/High-Speed I²C protocols; SDA is bidirectional open-drain |
| A0 / A1 | I²C Address Inputs | Set slave address bits (0x48–0x4F); allow up to four TSC2003IR devices on same bus |
| VBAT1 / VBAT2 | Battery Monitor Inputs | High-impedance inputs (10 kΩ during sampling) for direct connection to battery rails via internal 4:1 divider |
| IN1 / IN2 | Auxiliary Analog Inputs | Single-ended channels referenced to internal 2.5V or external VREF; usable for system voltage or sensor monitoring |
| VREF | Reference Input/Output | Accepts external 2.0V–VDD reference or outputs internal 2.5V reference; unbuffered, <6 µA input current |
Key Features
| Feature | Design Value |
|---|---|
| Ratiometric Touch Measurement | Uses Y+/Y− driver outputs as differential reference-rejects switch RON error and enables accurate position tracking without calibration |
| Integrated Power Management | Configurable power-down modes (PD0/PD1) reduce quiescent current to 3 µA (non-addressed, SDA/SCL high) and disable internal reference to save power |
| Dual Battery Monitoring | Simultaneous 0.5V–6.0V measurement on VBAT1/VBAT2 with ±3% accuracy using internal reference-supports main/backup battery tracking |
| On-Die Temperature Sensing | Two independent diode-based sensors (TEMP0/TEMP1) enable either calibrated single-point (±3°C) or differential two-point (±2°C) ambient temperature measurement |
| Touch Pressure Calculation | Supports Z1/Z2 cross-panel measurements to compute touch resistance-enables pressure-sensitive UI interaction without external circuitry |
Applications
| Handheld Point-of-Sale Terminal | Industrial Portable Instrument |
|---|---|
Use Scenario: Operator interacts with resistive touchscreen to enter orders, scan barcodes, and confirm transactions in warehouse or retail environments. IC Role / Device Role / Timing Role: TSC2003IR digitizes X/Y coordinates, detects pen-down events via PENIRQ, measures battery voltage for low-power alerts, and monitors ambient temperature for display brightness compensation. Use Value: Integrated battery and temperature sensing eliminates need for discrete monitoring ICs; ratiometric architecture ensures consistent touch accuracy across varying supply and panel conditions. | Use Scenario: Field technician uses ruggedized handheld multimeter or data logger with resistive touchscreen under variable temperature and battery-voltage conditions. IC Role / Device Role / Timing Role: TSC2003IR provides touch interface control, monitors primary and backup battery health (VBAT1/VBAT2), and tracks internal die temperature to flag thermal derating or calibration drift. Use Value: Dual battery inputs enable failover awareness; differential temperature mode delivers ±2°C accuracy without factory calibration-reducing test time and BOM cost. |
| Cellular Phone UI Subsystem | Medical Patient Monitor Display |
Use Scenario: Feature phone with resistive touchscreen requires low-power, space-constrained touch controller supporting stylus input and battery telemetry. IC Role / Device Role / Timing Role: TSC2003IR handles touch coordinate acquisition, generates PENIRQ for CPU wake-up, measures battery voltage for fuel-gauge estimation, and samples auxiliary input for keypad backlight control. Use Value: 3 µA standby current extends idle battery life; I²C High-Speed mode (3.4 MHz) enables fast coordinate polling during active UI navigation. | Use Scenario: Clinical-grade patient monitor displays vital signs on resistive touchscreen while operating continuously from AC adapter or internal Li-ion battery. IC Role / Device Role / Timing Role: TSC2003IR manages touch input, monitors main battery (VBAT1) and backup supercapacitor (VBAT2), and performs on-die temperature measurement to validate ADC stability during long-duration acquisitions. Use Value: Internal 2.5V reference drift (25 ppm/°C) ensures stable conversion gain over medical operating temperature range (–40°C to +85°C); PENIRQ enables immediate UI response to clinician touch. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar touch screen controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TSC2007IPW | 12-bit resolution, same TSSOP-16 package, but adds auto-scan mode and improved noise immunity; higher quiescent current (1.2 mA active) | Targeted at higher-noise LCD environments; lacks VFBGA-48 option | Select when continuous coordinate streaming or enhanced EMI rejection is required; not drop-in due to different register map and timing |
| Analog Devices AD7879-1WARUZ | 12-bit SAR ADC, 2.7V–3.6V supply only, integrated charge pump for touch drive, no internal reference | Requires external reference and biasing; optimized for ultra-low-power (<1 µA shutdown) portable designs | Prefer for battery-critical wearables; incompatible supply range and missing VBAT/temperature features of TSC2003IR |
Compared with TSC2003IR, TSC2007IPW offers enhanced noise handling and auto-scan but increases power and changes firmware interface, while AD7879-1WARUZ reduces sleep current significantly but sacrifices battery monitoring, internal reference, and wide-supply flexibility-making TSC2003IR optimal for cost-sensitive, multi-function portable UIs needing integrated telemetry.
Availability
TSC2003IR is available at Aetrix Electronics and suitable for handheld point-of-sale terminals, industrial portable instruments, and cellular phone UI subsystems requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for TSC2003IR 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 specializing in analog, embedded processing, and digital signal technologies with leadership in precision data converters and human-interface solutions.
The TSC2003IR belongs to TI's touch screen controller product line, designed specifically for integration into space-constrained, battery-powered portable devices requiring simultaneous touch coordinate acquisition, battery telemetry, and ambient temperature monitoring.
FAQ
What is the operating supply voltage range for the TSC2003IR?
The TSC2003IR operates from 2.5V to 5.25V, with specified performance guaranteed between 2.7V and 3.6V. The internal 2.5V reference remains functional down to 2.7V supply, and battery monitoring supports input voltages from 0.5V to 6.0V via internal scaling. This wide supply range allows direct integration into systems powered by single-cell Li-ion, NiMH, or regulated 3.3V/5V rails without additional level-shifting circuitry. The TSC2003IR maintains full functionality-including PENIRQ assertion, I²C communication, and ADC conversion-across this entire range.
How does the TSC2003IR achieve accurate touch position measurement despite switch resistance variation?
The TSC2003IR achieves accurate touch position measurement by using differential reference mode: Y+ and Y− drivers serve directly as the +REF and –REF inputs to the SAR ADC, making the conversion inherently ratiometric. This architecture cancels out errors caused by switch-on-resistance (5.5Ω on Y+, 7.3Ω on Y−) and eliminates dependence on absolute reference voltage stability. As a result, position accuracy remains consistent even with process, voltage, and temperature variations-no calibration is needed for basic X/Y coordinate acquisition. The TSC2003IR implements this automatically during touch measurement sequences without requiring host software intervention.
Can the TSC2003IR monitor two separate batteries simultaneously?
Yes, the TSC2003IR supports simultaneous monitoring of two independent battery rails via dedicated VBAT1 and VBAT2 inputs. Each input accepts 0.5V–6.0V and connects to an internal 4:1 resistor divider before digitization by the 12-bit ADC. Accuracy is ±3% when using the internal 2.5V reference, and measurements are performed sequentially under host I²C command. This dual-battery capability enables robust power management in devices with primary/backup cells or split-rail architectures-such as handheld scanners with removable main battery and non-volatile memory backup-without adding external monitoring ICs or multiplexers.
What temperature measurement methods does the TSC2003IR support, and how do they differ in accuracy?
The TSC2003IR supports two temperature measurement methods: TEMP0-only mode (single diode, ±3°C absolute accuracy, 0.3°C/LSB resolution) and differential TEMP0/TEMP1 mode (two diode readings with 91× current ratio, ±2°C absolute accuracy, 1.6°C/LSB resolution). The first method requires one-time calibration at known temperature; the second eliminates calibration need by computing delta-V across matched diodes. Both use the same on-die junctions and share the same 25 ppm/°C reference drift. Host firmware selects mode via I²C register configuration-no hardware change is needed. The TSC2003IR delivers these capabilities without external components, reducing BOM count and layout area.
Does the TSC2003IR require external passive components for basic operation?
The TSC2003IR requires minimal external components for basic operation: a 30kΩ–100kΩ pull-up resistor on PENIRQ, decoupling capacitors (0.1µF ceramic + optional 1–10µF bulk) on +VDD, and standard I²C pull-ups on SDA/SCL. No external reference, op-amps, or RC filters are mandatory-its internal 2.5V reference, low-leakage analog inputs (0.1 µA), and integrated touch drivers eliminate typical support circuitry. Optional 0.1µF capacitors across X+/X− and Y+/Y− may be added for LCD noise suppression, but are not required for functional operation. This component reduction simplifies design, improves reliability, and shrinks PCB footprint-key advantages in compact portable devices using the TSC2003IR.
TSC2003IR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- -
- Touchscreen:
- 4 Wire Resistive
- Resolution (Bits):
- 12 b
- Interface:
- I2C
- Voltage Reference:
- Internal
- Voltage - Supply:
- 2.5V ~ 5.25V
- Current - Supply:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-TSSOP
TSC2003IR FAQ
1.How can I place an order for TSC2003IR through Aetrix?
Please submit a Request for Quotation (RFQ) for TSC2003IR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TSC2003IR reliable?
The price and inventory of TSC2003IR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSC2003IR is usually 5 days.
3.What payment methods are accepted for TSC2003IR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSC2003IR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TSC2003IR?
TSC2003IR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSC2003IR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TSC2003IR?
For technical support, including TSC2003IR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSC2003IR requirements.
6.How does Aetrix verify that TSC2003IR is sourced from the original manufacturer or authorized distributors?
All TSC2003IR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TSC2003IR meets industry standards.
7.What is the process for return or replacement of TSC2003IR?
All TSC2003IR units undergo pre-shipment inspection (PSI). If there is an issue with TSC2003IR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TSC2003IR part is unused and in its original packaging.
Return procedure for TSC2003IR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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