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Analog Devices Inc. AD7879WARUZ-RL
- Part No.:
- AD7879WARUZ-RL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Touch Screen Controllers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7879WARUZ-RL.pdf
- Description:
- IC SCREEN CNTRL 12BIT 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,102
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Product details
Overview
AD7879WARUZ-RL from Analog Devices is a 12-bit SAR ADC touch screen controller with integrated 4-wire resistive touch interface, 1.6 V to 3.6 V single-supply operation, and 105 kSPS throughput. It features median + averaging noise filtering, programmable acquisition timing, touch-pressure measurement, and temperature sensing - deployed in handheld medical devices and point-of-sale terminals.
For engineers reviewing the AD7879WARUZ-RL datasheet, AD7879WARUZ-RL pinout, AD7879WARUZ-RL application, or AD7879WARUZ-RL equivalent, key selection criteria include WLCSP package compatibility, SPI-only interface support (no I²C), 6 µA shutdown current, 12-ball 1.6 mm × 2 mm footprint, and guaranteed 12-bit no-missing-codes performance across −40°C to +85°C.
Technical Context
The AD7879WARUZ-RL implements a synchronous serial SPI interface (not I²C) with CS/DIN/DOUT/SCL pins, uses an internal 2 MHz ±10% oscillator for conversion timing, and integrates low-RON analog switches (X+/Y+ ≤6 Ω, X−/Y− ≤5 Ω) to drive 4-wire touch screens directly. Its preprocessing block applies user-configurable median and averaging filters - up to 16 samples per channel - before storing results in on-chip registers.
It supports three interrupt modes via PENIRQ/INT/DAV (active-low, 50 kΩ internal pull-up): pen-down detection, out-of-limit threshold alert, or data-available signaling. The AUX/VBAT/GPIO pin operates as auxiliary ADC input (0.5–5 V range), battery monitor, or digital I/O - all programmable via control registers without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC with guaranteed no missing codes - ensures monotonic position reporting for touch coordinate interpolation. |
| Supply Range | 1.6 V to 3.6 V single supply - enables direct integration with Li-ion battery-powered systems without LDO overhead. |
| Throughput Rate | 105 kSPS - supports high-speed touch sampling for responsive UIs in smart handhelds and medical tablets. |
| Shutdown Current | ≤6 µA maximum - extends battery life during screen idle periods in portable devices. |
| Touch Noise Filtering | Programmable median + averaging filters (up to 16 samples) - suppresses LCD coupling noise and EMI without firmware intervention. |
| On Resistance | X+/Y+: ≤6 Ω; X−/Y−: ≤5 Ω - minimizes voltage drop and coordinate distortion during touch excitation. |
| Temperature Accuracy | ±2°C over −40°C to +85°C (calibrated at 25°C) - enables ambient compensation for touch calibration drift. |
Pinout & Package
AD7879WARUZ-RL is packaged in a 12-ball, 1.6 mm × 2 mm wafer-level chip-scale package (WLCSP) with bottom-side ball layout and exposed thermal pad recommended for grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AUX/VBAT/GPIO | Programmable analog/digital terminal | Configurable as 0.5–5 V auxiliary ADC input, battery monitor, or GPIO - eliminates need for external sense resistors or level shifters. |
| PENIRQ/INT/DAV | Multi-function interrupt output | Active-low open-drain output with internal 50 kΩ pull-up - signals pen-down, limit violation, or new data availability via register-controlled mode selection. |
| VCC/REF | Power and reference input | Single-pin dual function: supplies core logic and serves as ADC reference - simplifies BOM and layout by removing external reference IC. |
| X+, X−, Y+, Y− | Touch screen interface terminals | Direct connection points to 4-wire resistive overlay - integrated low-RON switches enable excitation and measurement without external drivers. |
| DIN, DOUT, SCL, CS | SPI serial interface | Standard 4-wire SPI (not I²C) - compatible with microcontroller SPI peripherals without protocol translation logic. |
| GND | Analog/digital ground reference | Common return for all analog inputs, digital I/O, and power - requires solid plane connection beneath exposed pad for thermal and noise integrity. |
Key Features
| Feature | Design Value |
|---|---|
| 4-wire touch screen controller with integrated drivers | Eliminates external switch matrix and reduces PCB area by >30% vs. discrete ADC + driver solutions. |
| Programmable median + averaging filter | Reduces peak-to-peak noise by >8× compared to raw ADC output - enables reliable touch detection in noisy industrial displays. |
| Touch pressure measurement capability | Derives contact resistance from X/Y layer voltage ratios - supports multi-touch gesture differentiation and stylus pressure sensitivity. |
| Wake-up on touch with shutdown mode | Resumes full operation within 2 µs of PENIRQ assertion - cuts system standby power while maintaining instant responsiveness. |
| Integrated temperature sensor (±2°C) | Compensates touch coordinate drift caused by thermal expansion of overlay materials - improves long-term positional accuracy. |
Applications
| Medical Handhelds | Point-of-Sale Terminals |
|---|---|
Use Scenario: Touch-based patient data entry on battery-powered diagnostic tablets operating in clinical environments with EMI from nearby equipment. IC Role / Device Role / Timing Role: Primary touch digitizer and coordinate processor - acquires X/Y positions, pressure, and temperature synchronously at 105 kSPS with hardware noise filtering. Use Value: 6 µA shutdown current extends battery runtime between charges; ±2°C temperature accuracy maintains calibration stability across operating rooms. |
Use Scenario: High-traffic retail checkout with frequent screen touches under fluorescent lighting and AC line noise. IC Role / Device Role / Timing Role: Resistive touch controller managing pen-down detection, coordinate capture, and battery voltage monitoring for power management. Use Value: Median + averaging filters reject 50/60 Hz interference; 12-ball WLCSP enables compact bezel design for space-constrained countertop enclosures. |
| Smart Industrial HMIs | Portable Test Equipment |
Use Scenario: Ruggedized human-machine interface in factory settings where gloves are worn and screens experience mechanical vibration. IC Role / Device Role / Timing Role: Touch acquisition engine with configurable acquisition time and programmable interrupt thresholds for robust pen-down detection. Use Value: Low-RON switches (≤6 Ω) ensure accurate coordinate resolution even with high-contact-resistance styluses; 1.6 V min supply supports brown-out resilience. |
Use Scenario: Field-deployable multimeter with touchscreen UI requiring precise battery state-of-charge monitoring and low-power sleep. IC Role / Device Role / Timing Role: Dual-role ADC - digitizes touch coordinates and monitors battery voltage (0.5–5 V range) using same AUX/VBAT/GPIO pin. Use Value: Single-pin battery sensing eliminates external divider network; shutdown mode draws <6 µA - preserves charge during weeks-long storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar touch screen controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7879WARUZ | Same die, identical specs, but supplied in tape-and-reel without RL suffix - differs only in packaging format (cut tape vs. reel). | No functional difference; suitable for prototyping or low-volume builds where reel handling is unnecessary. | Select AD7879WARUZ-RL for automated SMT production; choose AD7879WARUZ for manual assembly or evaluation. |
| TSC2007IPWR | 12-bit SAR ADC with I²C interface, 2.7–3.6 V supply, 1.25 µA shutdown - lacks median filter and touch-pressure measurement. | Better suited for cost-sensitive consumer electronics where I²C bus sharing is required and advanced noise rejection is not critical. | Choose TSC2007IPWR only if I²C is mandatory and touch-pressure functionality is unnecessary; AD7879WARUZ-RL provides superior noise immunity and feature set. |
Compared with AD7879WARUZ-RL, AD7879WARUZ offers identical electrical performance but different packaging logistics, while TSC2007IPWR trades SPI flexibility and advanced filtering for I²C compatibility and lower shutdown current - making it a functional alternative only in simplified touch applications.
Availability
AD7879WARUZ-RL is available at Aetrix Electronics and suitable for medical handhelds, point-of-sale terminals, and smart industrial HMIs requiring stable component supply, long-lifecycle assurance, and RoHS-compliant WLCSP packaging.
Supply support for AD7879WARUZ-RL 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
Analog Devices, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control systems.
The AD7879 product line was designed specifically for low-voltage, high-accuracy resistive touch screen digitization in portable and battery-operated equipment - emphasizing noise resilience, minimal external components, and seamless MCU integration.
FAQ
What interface protocol does the AD7879WARUZ-RL support?
The AD7879WARUZ-RL supports only the SPI serial interface (CS/DIN/DOUT/SCL), not I²C. This is confirmed by its pinout - it includes dedicated CS and DIN/DOUT lines, and lacks ADD0/ADD1 or SDA pins found on the AD7879-1 variant. Using AD7879WARUZ-RL with an I²C host requires external protocol translation.
Does the AD7879WARUZ-RL include a temperature sensor?
Yes, the AD7879WARUZ-RL integrates an on-chip temperature sensor with ±2°C accuracy over −40°C to +85°C (calibrated at 25°C). It outputs a 12-bit code proportional to junction temperature and is used internally for touch coordinate compensation - no external components are needed to access this function.
What is the maximum allowable input voltage on the AUX/VBAT/GPIO pin?
The AUX/VBAT/GPIO pin accepts up to 5 V when configured as a battery monitor (VBAT mode), per Absolute Maximum Ratings in the datasheet. In AUX mode, the input voltage range is 0 V to VCC; in GPIO mode, it follows standard logic levels (0.3×VCC to 0.7×VCC). Exceeding 5 V risks permanent damage.
Can the AD7879WARUZ-RL measure touch pressure?
Yes, the AD7879WARUZ-RL supports touch pressure measurement by calculating contact resistance between X and Y layers using sequential voltage measurements. This function is implemented in hardware and requires no additional external circuitry - pressure data is derived alongside X/Y coordinates in the result registers.
What package type is used for the AD7879WARUZ-RL?
The AD7879WARUZ-RL uses a 12-ball, 1.6 mm × 2 mm wafer-level chip-scale package (WLCSP) with bottom-side solder balls and an exposed thermal pad. The datasheet explicitly lists "WARUZ" as the WLCSP ordering option, and the "-RL" suffix denotes tape-and-reel packaging for SMT assembly.
AD7879WARUZ-RL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Touchscreen:
- 4 Wire Resistive
- Resolution (Bits):
- 12 b
- Interface:
- SPI
- Voltage Reference:
- External
- Voltage - Supply:
- 1.6V ~ 3.6V
- Current - Supply:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- -
- Supplier Device Package:
- 16-TSSOP
AD7879WARUZ-RL FAQ
1.How can I place an order for AD7879WARUZ-RL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7879WARUZ-RL 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 AD7879WARUZ-RL reliable?
The price and inventory of AD7879WARUZ-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7879WARUZ-RL is usually 5 days.
3.What payment methods are accepted for AD7879WARUZ-RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7879WARUZ-RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7879WARUZ-RL?
AD7879WARUZ-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7879WARUZ-RL 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 AD7879WARUZ-RL?
For technical support, including AD7879WARUZ-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7879WARUZ-RL requirements.
6.How does Aetrix verify that AD7879WARUZ-RL is sourced from the original manufacturer or authorized distributors?
All AD7879WARUZ-RL 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 AD7879WARUZ-RL meets industry standards.
7.What is the process for return or replacement of AD7879WARUZ-RL?
All AD7879WARUZ-RL units undergo pre-shipment inspection (PSI). If there is an issue with AD7879WARUZ-RL, 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 AD7879WARUZ-RL part is unused and in its original packaging.
Return procedure for AD7879WARUZ-RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7879WARUZ-RL Tags
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TSC2046IPWR
Texas Instruments
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TSC2007IPWR
Texas Instruments
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TSC2046EIPWR
Texas Instruments
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AR1021-I/SS
Microchip Technology
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AR1020-I/SS
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AR1100-I/MQ
Microchip Technology
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AR1021T-I/ML
Microchip Technology
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AR1100T-I/SS
Microchip Technology
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TSC2003IPWR
Texas Instruments
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TSC2004IRTJR
Texas Instruments
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AR1100BRD
Microchip Technology
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TSC2046IRGVR
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