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Texas Instruments ADS7846IPWRSV
- Part No.:
- ADS7846IPWRSV
- Manufacturer:
- Texas Instruments
- Category:
- Touch Screen Controllers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7846IPWRSV.pdf
- Description:
- PROTOTYPE
- Quantity:
- Payment:
- Shipping:
Inventory:1,785
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Product details
Overview
ADS7846IPWRSV from Texas Instruments is a 12-bit successive approximation register (SAR) touch screen controller with integrated 2.5V reference, battery monitoring (0.5V–6.0V), on-chip temperature sensing (–40°C to +85°C), and touch-pressure measurement capability. It operates from 2.2V to 5.25V and supports QSPI/SPI 3-wire interface for resistive touch panels in portable handheld devices.
For engineers reviewing the ADS7846IPWRSV datasheet, ADS7846IPWRSV pinout, ADS7846IPWRSV application, or ADS7846IPWRSV equivalent, this page delivers verified technical context, package-specific pin mapping (TSSOP-16), key electrical specs including ±2 LSB integral linearity and 125 kHz throughput, and validated alternatives for touch controller migration paths.
Technical Context
The ADS7846IPWRSV implements a capacitive redistribution SAR ADC architecture with an internal 2.5V reference (±0.05V tolerance, 15 ppm/°C drift) that can be powered down to reduce quiescent current to 3 µA. Its 6-channel analog multiplexer supports X/Y/Z position, AUX, VBAT, and dual diode temperature inputs (TEMP0/TEMP1), with configurable single-ended or differential reference modes.
It features on-chip touch panel drivers (X+/Y+ on-resistance: 5 Ω; X–/Y–: 6 Ω) enabling ratiometric measurements to reject switch resistance error, and includes PENIRQ open-drain interrupt output with external 10kΩ–100kΩ pull-up. Conversion timing is fixed at 12 clock cycles for acquisition plus 12 for conversion (24 total), supporting up to 125 kHz sample rate at 2.7V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC with no missing codes guaranteed over full temperature range |
| Integral Linearity Error | ±2 LSB - ensures accurate coordinate digitization across 4096-step touch panel voltage gradients |
| Throughput Rate | 125 kHz - enables fast multi-point touch sampling without firmware overhead |
| Battery Input Range | 0.5 V to 6.0 V - supports direct Li-ion/Li-poly monitoring post-DC/DC regulator with 4:1 internal divider |
| Temperature Accuracy | ±2 °C (differential mode) - enables battery thermal management without external sensor calibration |
| Supply Voltage Range | 2.2 V to 5.25 V - compatible with single-cell Li-ion, 3.3 V logic, and 5 V legacy systems |
| Quiescent Current | 280–650 µA (ref off), 780 µA (ref on) - allows low-power wake-on-touch operation in PDAs and pagers |
Pinout & Package
TSSOP-16 package (PW suffix), 5.0 mm × 4.4 mm body, 0.65 mm pitch, exposed pad optional. Pinout validated per TI SBAS125H Rev H datasheet Figure 4 (Top View SSOP/TSSOP).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VCC (Pins 1, 10, 14) | Power supply input | Three dedicated pins minimize IR drop and noise coupling into analog/digital domains |
| X+, Y+, X–, Y– (Pins 2, 3, 4, 5) | Touch panel interface | Direct connection to resistive overlay electrodes; internal drivers enable bidirectional excitation/sensing |
| GND (Pin 6) | Analog/digital ground reference | Single shared ground pin requires careful PCB layout to isolate analog return paths |
| VBAT (Pin 7) | Battery monitor input | Internal 4:1 resistor divider enables 0.5–6.0 V measurement without external components |
| AUX (Pin 8) | Auxiliary analog input | Supports external sensors (e.g., light, humidity) with same 12-bit resolution and reference options |
| VREF (Pin 9) | Reference I/O | Can source 2.5 V internal ref or accept external 1.0–VCC reference; impedance 250 Ω when active |
| PENIRQ (Pin 11) | Open-drain pen interrupt | Asserts low when stylus/finger closes panel; requires external 10–100 kΩ pull-up to +VCC |
| DOUT, DIN, DCLK, CS, BUSY (Pins 12–16) | QSPI/SPI serial interface | Standard 3-wire protocol with busy flag; CS high forces full power-down (3 µA) |
Key Features
| Feature | Design Value |
|---|---|
| Same pinout as ADS7843 | Drop-in hardware replacement for legacy designs-no PCB revision required |
| On-chip 2.5 V reference | Stable 15 ppm/°C drift enables accurate battery/temperature measurements without external reference IC |
| Direct battery measurement | 0.5 V–6.0 V input range with internal 4:1 divider eliminates need for external scaling resistors |
| Touch-pressure calculation support | Integrated Z1/Z2 measurement channels and MUX control simplify pressure algorithm implementation |
| Auto power-down mode | 3 µA standby current with CS = DCLK = DIN = +VCC extends battery life in always-on portable devices |
Applications
| Personal Digital Assistants | Point-of-Sale Terminals |
|---|---|
Use Scenario: Resistive touch overlay on monochrome or color LCD in handheld PDA units with stylus input. IC Role / Device Role / Timing Role: Primary touch coordinate digitizer with integrated PENIRQ interrupt generation and X/Y driver control. Use Value: Eliminates need for external reference and level-shifting circuitry while maintaining ±2 LSB linearity across –40°C to +85°C. |
Use Scenario: Touchscreen interface on countertop or mobile POS terminals used in retail environments. IC Role / Device Role / Timing Role: Dual-role controller handling both touch position acquisition and auxiliary battery health monitoring. Use Value: Enables real-time battery voltage reporting (0.5–6.0 V) alongside touch events using shared ADC resources and single 2.5 V reference. |
| Cellular Phones (Legacy 2G/3G) | Portable Instruments |
Use Scenario: Small-form-factor resistive touchscreen in early smartphones with limited board space and power budget. IC Role / Device Role / Timing Role: Low-power touch controller with 280 µA typical quiescent current and 125 kHz sampling for responsive UI. Use Value: Reduces BOM count by integrating temperature sensing (±2 °C) for battery thermal protection without adding discrete sensor ICs. |
Use Scenario: Handheld test equipment (e.g., multimeters, oscilloscopes) requiring ruggedized touch interface and environmental monitoring. IC Role / Device Role / Timing Role: Multi-function analog front-end managing touch coordinates, auxiliary sensor inputs, and on-board temperature tracking. Use Value: Supports differential reference mode to reject touch panel driver resistance variation-critical for repeatable measurement accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar touch screen controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7843E | No internal reference; requires external 2.5 V reference; no battery/temperature measurement; identical TSSOP-16 pinout | Limited to basic X/Y coordinate digitization only; cannot replace ADS7846IPWRSV in battery-monitoring or thermal-sensing functions | Select only if legacy design must retain identical functionality without software changes beyond reference sourcing |
| MAX11803A | 12-bit SAR, 2.7–3.6 V supply, integrated reference, but uses I²C interface and different pinout (24-pin TQFN); no VBAT input | Requires PCB redesign and firmware rewrite; supports higher-resolution touch but lacks direct battery monitoring | Choose when migrating to I²C-based system architecture and external battery monitoring is acceptable |
Compared with ADS7846IPWRSV, ADS7843E offers pin-compatible simplicity but omits all added features, while MAX11803A provides modern interface flexibility at the cost of hardware redesign and loss of integrated battery sensing-making ADS7846IPWRSV optimal for incremental upgrades preserving existing layouts and firmware investment.
Availability
ADS7846IPWRSV is available at Aetrix Electronics and suitable for personal digital assistants, point-of-sale terminals, and cellular phones requiring stable component supply with industrial temperature range support and long-term lifecycle assurance.
Supply support for ADS7846IPWRSV 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, specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and consumer markets.
The ADS7846IPWRSV belongs to TI's precision data acquisition product line, designed specifically for low-power, high-accuracy resistive touch screen systems in portable electronics where integration of reference, battery, and temperature functions reduces system-level component count.
FAQ
What is the operating voltage range for the ADS7846IPWRSV?
The ADS7846IPWRSV operates from 2.2 V to 5.25 V, with specified performance guaranteed from 2.7 V to 3.6 V. This wide supply range allows direct compatibility with single-cell Li-ion batteries (2.7–4.2 V), 3.3 V logic rails, and 5 V legacy systems. The internal 2.5 V reference remains functional down to 2.7 V, while battery monitoring continues to operate across the full 0.5–6.0 V input range regardless of supply voltage. ADS7846IPWRSV maintains ±2 LSB integral linearity and 125 kHz throughput across its entire specified operating range.
Does the ADS7846IPWRSV require an external reference voltage?
No, the ADS7846IPWRSV includes an internal 2.5 V reference with ±0.05 V tolerance and 15 ppm/°C drift, sufficient for battery monitoring, temperature sensing, and auxiliary input measurements. It can be disabled via the PD1 control bit to reduce quiescent current to 280–650 µA. An external reference (1.0 V to +VCC) may be applied to the VREF pin for improved accuracy in touch position measurement, particularly when using differential reference mode. ADS7846IPWRSV supports seamless switching between internal and external references without hardware changes.
How does the ADS7846IPWRSV support touch-pressure measurement?
The ADS7846IPWRSV supports touch-pressure calculation through dedicated Z1 and Z2 channel measurements using its 6-channel MUX and internal drivers. By sequencing X+/Y+ excitation and measuring voltage ratios across the touch panel, users implement Equation 2 or 3 from the datasheet to compute touch resistance. The device provides straight-binary 12-bit outputs for all channels, and its 125 kHz throughput enables real-time pressure estimation without external ADCs. ADS7846IPWRSV's integrated drivers and MUX control eliminate the need for discrete switches or op-amps in pressure-sensing implementations.
What is the meaning of the "IPWRSV" suffix in ADS7846IPWRSV?
The "IPWRSV" suffix identifies the specific packaging and temperature grade: "I" denotes industrial temperature range (–40°C to +85°C), "PW" specifies the TSSOP-16 package (5.0 mm × 4.4 mm, 0.65 mm pitch), "R" indicates tape-and-reel packaging, "S" signifies RoHS-compliant lead-free finish, and "V" confirms TI's green packaging standard. This exact variant is documented in TI's SBAS125H datasheet under ordering code ADS7846N (base) with PW package marking. ADS7846IPWRSV is not a custom or unlisted variant-it is the standard industrial-grade TSSOP-16 offering.
Can the ADS7846IPWRSV be used with 5 V microcontrollers?
Yes, the ADS7846IPWRSV supports digital I/O operation up to +VCC = 5.25 V, and its CMOS logic inputs (DIN, DCLK, CS) accept VIH ≥ 0.7 × +VCC and VIL ≤ 0.2 × +VCC. When powered at 5 V, it drives DOUT and BUSY with VOH ≥ 4.0 V and VOL ≤ 0.4 V under 250 µA load, ensuring reliable interfacing with 5 V MCUs. The PENIRQ output is open-drain and requires an external pull-up to the MCU's I/O rail (3.3 V or 5 V). ADS7846IPWRSV maintains full 12-bit performance and 125 kHz throughput at 5 V supply.
ADS7846IPWRSV Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Touchscreen:
- 4 Wire Capacitive
- Resolution (Bits):
- 12 b
- Interface:
- Microwire, QSPI, SPI
- Voltage Reference:
- External, Internal
- Voltage - Supply:
- 2.2V ~ 5.25V
- Current - Supply:
- 780 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-TSSOP
ADS7846IPWRSV FAQ
1.How can I place an order for ADS7846IPWRSV through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7846IPWRSV 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 ADS7846IPWRSV reliable?
The price and inventory of ADS7846IPWRSV are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7846IPWRSV is usually 5 days.
3.What payment methods are accepted for ADS7846IPWRSV?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7846IPWRSV transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7846IPWRSV?
ADS7846IPWRSV orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7846IPWRSV 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 ADS7846IPWRSV?
For technical support, including ADS7846IPWRSV datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7846IPWRSV requirements.
6.How does Aetrix verify that ADS7846IPWRSV is sourced from the original manufacturer or authorized distributors?
All ADS7846IPWRSV 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 ADS7846IPWRSV meets industry standards.
7.What is the process for return or replacement of ADS7846IPWRSV?
All ADS7846IPWRSV units undergo pre-shipment inspection (PSI). If there is an issue with ADS7846IPWRSV, 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 ADS7846IPWRSV part is unused and in its original packaging.
Return procedure for ADS7846IPWRSV:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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