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Home > Products > Integrated Circuits (ICs) > Data Acquisition > Touch Screen Controllers

Analog Devices Inc. AD7879-1WACPZ-RL

Name: AD7879-1WACPZ-RL
Brand: Analog Devices Inc.
SKU: AD7879-1WACPZ-RL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD7879-1WACPZ-RL

Manufacturer:: Analog Devices Inc.

Category:: Touch Screen Controllers

Package:: 16-VQFN Exposed Pad, CSP

Datasheet:: AD7879-1WACPZ-RL.pdf

Description:: IC SCREEN CNTRL 12BIT 16LFCSP

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Product details

Overview

AD7879-1WACPZ-RL from Analog Devices is a 12-bit I²C-compatible touch screen controller for 4-wire resistive panels, operating from 1.6 V to 3.6 V, featuring median/averaging noise filtering, touch-pressure measurement, and 105 kSPS throughput. It integrates low-R_ON analog switches (X+/Y+ ≤ 6 Ω), auxiliary ADC input (0.5–5 V), and programmable GPIO/interrupt outputs (PENIRQ/INT/DAV), deployed in automotive infotainment and handheld medical devices.

For engineers reviewing the AD7879-1WACPZ-RL datasheet, AD7879-1WACPZ-RL pinout, AD7879-1WACPZ-RL application, or AD7879-1WACPZ-RL equivalent, key selection criteria include I²C interface compatibility, 16-lead 4 mm × 4 mm LFCSP packaging, −40°C to +85°C automotive qualification, ratiometric touch measurement capability, and integrated temperature sensing with ±2°C accuracy.

Technical Context

The AD7879-1WACPZ-RL implements a 12-bit SAR ADC with internal track-and-hold, dual 3-to-1 reference multiplexer, and programmable acquisition timing. Its analog front end includes low-R_ON switches (X+/Y+: 6 Ω typ; X−/Y−: 5 Ω typ) and supports both ratiometric (default) and single-ended touch coordinate conversion modes.

It features an automatic conversion sequencer with timer-based or touch-triggered operation, median + averaging filters (up to 16 samples), and three interrupt modes (PENIRQ, INT, DAV) driven by dedicated registers. The AUX/VBAT/GPIO pin functions as ADC auxiliary input, battery monitor, or digital I/O under register control.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	12-bit SAR ADC with no missing codes - ensures full-scale linearity for precise X/Y coordinate digitization.
Supply Range	1.6 V to 3.6 V - enables direct integration into single-supply battery-powered systems (e.g., 2.8 V Li-ion).
Throughput Rate	105 kSPS - supports fast touch response (<10 µs conversion time) for real-time gesture tracking.
Touch Interface	4-wire resistive only - requires external X/Y layer excitation but eliminates need for external drivers or op-amps.
Interface Protocol	I²C-compatible (400 kHz max) - uses ADD0/ADD1 pins for address configuration; no SPI CS/DIN/DOUT required.
Temperature Accuracy	±2°C over −40°C to +85°C - calibrated at 25°C; enables system-level thermal compensation without external sensor.
Shutdown Current	≤6 µA - extends battery life in always-on portable devices during idle periods.

Pinout & Package

AD7879-1WACPZ-RL is housed in a 16-lead, 4 mm × 4 mm lead frame chip scale package (LFCSP) with exposed pad (EP) recommended for soldering to ground plane for thermal and mechanical reliability.

Pin/Terminal	Circuit Role	Design Meaning
1 Y+	Touch screen analog input	High-side excitation and sensing node for Y-layer; connected internally to low-R_ON switch and ADC MUX.
4 X−	Touch screen analog input	Low-side excitation and sensing node for X-layer; referenced to GND during ratiometric measurement.
5 Y−	Touch screen analog input	Low-side excitation and sensing node for Y-layer; used as ADC reference (REF−) in ratiometric mode.
7 GND	Ground reference	Common return for all analog/digital circuitry; must be low-impedance connection to system ground plane.
8 SCL	I²C clock input	Drives internal timing for I²C communication; compatible with standard 400 kHz bus timing (t_LOW/t_HIGH ≥ 1.3 µs).
9 SDA	I²C bidirectional data	Open-drain I²C data line; supports multi-master arbitration and ACK/NACK signaling per I²C spec.
12 PENIRQ/INT/DAV	Programmable interrupt output	Active-low open-drain output; configurable as pen-down detect (PENIRQ), limit alert (INT), or data-ready (DAV).
13 AUX/VBAT/GPIO	Multi-function terminal	Configurable via register: auxiliary ADC input (0.5–5 V), battery voltage monitor, or digital I/O with pull-up/down control.
14 ADD0	I²C address bit 0	Hardware-configurable LSB of 7-bit I²C slave address; tied high/low to select one of two device addresses.
15 VCC/REF	Power and reference supply	Single 1.6–3.6 V supply powers core logic and serves as ADC reference for AUX/VBAT/TEMP channels.
16 X+	Touch screen analog input	High-side excitation and sensing node for X-layer; used as ADC input during Y-position measurement.
EP	Exposed thermal pad	Not electrically connected; must be soldered to PCB ground plane to meet θ_JA = 30.4°C/W thermal spec.

Key Features

Feature	Design Value
Ratiometric touch measurement	Uses Y+ and Y− as ADC reference inputs - eliminates errors from switch R_ON and supply drift, enabling accurate position detection across varying VCC.
Programmable median + averaging filter	Configurable filter depth (1–16 samples) and type - suppresses LCD noise and transient spikes without sacrificing update rate.
Touch-pressure estimation	Calculates contact resistance (R_TOUCH) from sequential X/Y measurements - provides proportional pressure feedback for UI haptics or stylus force sensitivity.
Wake-up on touch	Generates PENIRQ interrupt from deep shutdown (6 µA) - allows host MCU to remain asleep until user interaction occurs.
Automotive qualification	AEC-Q100 Grade 3 (−40°C to +85°C) - validated for use in dashboard displays, rear-seat entertainment, and ADAS human-machine interfaces.

Applications

Automotive Infotainment Display	Handheld Medical Monitor
Use Scenario: Touch-responsive center console display in passenger vehicles with ambient temperature extremes and EMI from ignition systems. IC Role / Device Role / Timing Role: Primary touch coordinate digitizer and pressure estimator; manages excitation sequencing, noise filtering, and interrupt-driven wake-up for SoC coordination. Use Value: Delivers stable X/Y resolution (12-bit) and ±2°C thermal compensation across −40°C to +85°C, reducing firmware calibration overhead and improving UI responsiveness under vibration.	Use Scenario: Portable vital signs monitor with glove-compatible touchscreen used in clinical and field environments. IC Role / Device Role / Timing Role: Low-power touch controller interfacing to ARM Cortex-M4 host; handles battery monitoring (VBAT), temperature sensing, and PENIRQ-driven UI state transitions. Use Value: Enables <6 µA shutdown current and 0.5–5 V auxiliary input range - extends single-charge battery life while supporting dual-role AUX/VBAT pin for compact BOM design.
Industrial HMI Panel	Smart Point-of-Sale Terminal
Use Scenario: Dust- and moisture-resistant operator interface on factory floor machinery with high ESD risk (15 kV air discharge on X+/Y+). IC Role / Device Role / Timing Role: Robust touch acquisition engine with median filtering and 10 kV contact ESD protection on touch pins - maintains accuracy despite noisy 24 V DC plant power. Use Value: Integrates 5 kΩ internal pull-up on PENIRQ and supports ratiometric measurement - eliminates external level shifters and reduces layout sensitivity to ground bounce.	Use Scenario: Compact countertop payment terminal with capacitive-stylus support and battery backup for offline transactions. IC Role / Device Role / Timing Role: Dual-function controller managing touch input and 3.3 V system battery voltage monitoring via same AUX/VBAT/GPIO pin. Use Value: Reduces component count by combining touch digitization, battery telemetry, and interrupt signaling in one 4 mm × 4 mm LFCSP - accelerates CE/FCC certification via pre-qualified AEC-Q100 design.

Automotive Infotainment Display

Handheld Medical Monitor

Use Scenario: Touch-responsive center console display in passenger vehicles with ambient temperature extremes and EMI from ignition systems.

IC Role / Device Role / Timing Role: Primary touch coordinate digitizer and pressure estimator; manages excitation sequencing, noise filtering, and interrupt-driven wake-up for SoC coordination.

Use Value: Delivers stable X/Y resolution (12-bit) and ±2°C thermal compensation across −40°C to +85°C, reducing firmware calibration overhead and improving UI responsiveness under vibration.

Use Scenario: Portable vital signs monitor with glove-compatible touchscreen used in clinical and field environments.

IC Role / Device Role / Timing Role: Low-power touch controller interfacing to ARM Cortex-M4 host; handles battery monitoring (VBAT), temperature sensing, and PENIRQ-driven UI state transitions.

Use Value: Enables <6 µA shutdown current and 0.5–5 V auxiliary input range - extends single-charge battery life while supporting dual-role AUX/VBAT pin for compact BOM design.

Industrial HMI Panel

Smart Point-of-Sale Terminal

Use Scenario: Dust- and moisture-resistant operator interface on factory floor machinery with high ESD risk (15 kV air discharge on X+/Y+).

IC Role / Device Role / Timing Role: Robust touch acquisition engine with median filtering and 10 kV contact ESD protection on touch pins - maintains accuracy despite noisy 24 V DC plant power.

Use Value: Integrates 5 kΩ internal pull-up on PENIRQ and supports ratiometric measurement - eliminates external level shifters and reduces layout sensitivity to ground bounce.

Use Scenario: Compact countertop payment terminal with capacitive-stylus support and battery backup for offline transactions.

IC Role / Device Role / Timing Role: Dual-function controller managing touch input and 3.3 V system battery voltage monitoring via same AUX/VBAT/GPIO pin.

Use Value: Reduces component count by combining touch digitization, battery telemetry, and interrupt signaling in one 4 mm × 4 mm LFCSP - accelerates CE/FCC certification via pre-qualified AEC-Q100 design.

Equivalent & Alternatives

The following parts are listed as comparable options for similar touch screen controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AD7879WACPZ-RL	SPI-only interface; DIN/DOUT/CS pins instead of ADD0/ADD1/SDA; identical analog performance and LFCSP package.	Requires SPI master host; not compatible with I²C-only microcontrollers or existing I²C bus infrastructure.	Select when host MCU lacks I²C hardware or when SPI timing margins exceed I²C requirements (5 MHz vs. 400 kHz).
TSC2007IPWR	12-bit SAR ADC with integrated charge pump; supports 4-/5-/8-wire touch; 2.2–3.6 V supply; I²C interface; no temperature sensor.	Lacks on-chip temperature measurement and touch-pressure calculation logic; requires external firmware for R_TOUCH derivation.	Choose when multi-wire panel support or higher drive strength is needed, accepting added software complexity for pressure estimation.

Compared with AD7879WACPZ-RL and TSC2007IPWR, the AD7879-1WACPZ-RL uniquely balances I²C simplicity, automotive qualification, integrated temperature sensing, and hardware-accelerated touch-pressure computation - making it optimal for space-constrained, thermally demanding embedded touch systems requiring minimal host CPU intervention.

Availability

AD7879-1WACPZ-RL is available at Aetrix Electronics and suitable for automotive infotainment, handheld medical monitors, industrial HMIs, smart point-of-sale terminals, and portable test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7879-1WACPZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide and ISO 9001-certified manufacturing.

The AD7879 family was engineered specifically for low-voltage, low-power 4-wire resistive touch screen digitization in automotive and portable electronics - emphasizing noise resilience, integrated system functions (temp, battery, GPIO), and AEC-Q100 compliance.

FAQ

What interface protocol does the AD7879-1WACPZ-RL support?

The AD7879-1WACPZ-RL supports only the I²C-compatible interface, using pins ADD0 and ADD1 to configure its 7-bit slave address. Unlike the SPI-only AD7879WACPZ-RL variant, the AD7879-1WACPZ-RL omits DIN, DOUT, and CS pins entirely - confirming its exclusive reliance on SDA/SCL for register access and data readback.

Does the AD7879-1WACPZ-RL include an integrated temperature sensor?

Yes, the AD7879-1WACPZ-RL includes an on-chip temperature sensor with ±2°C accuracy over −40°C to +85°C, calibrated at 25°C. Temperature readings are accessible via dedicated result registers and require no external components - a feature retained identically across all AD7879 family variants including the AD7879-1WACPZ-RL.

What is the maximum sampling rate of the AD7879-1WACPZ-RL ADC?

The AD7879-1WACPZ-RL achieves a maximum throughput rate of 105 kSPS, with a typical conversion time of 9.5 µs (including 2 µs acquisition). This specification holds under full operation (ADC on, PM = 10) at VCC = 2.6 V and TA = 25°C - confirmed in Table 1 of the AD7879W datasheet applicable to AD7879-1WACPZ-RL.

Can the AD7879-1WACPZ-RL measure touch pressure, and how is it implemented?

Yes, the AD7879-1WACPZ-RL supports touch-pressure measurement by calculating contact resistance (R_TOUCH) between X and Y layers using sequential conversions. The device provides dedicated register controls and preprocessing logic to derive pressure - eliminating need for host-side computation - and is explicitly documented in the "Touch-Pressure Measurement" section of the AD7879W datasheet.

What package type and dimensions does the AD7879-1WACPZ-RL use?

The AD7879-1WACPZ-RL uses a 16-lead lead frame chip scale package (LFCSP) measuring 4 mm × 4 mm with an exposed thermal pad (EP). This matches the package specified for the AD7879-1W variant in Figures 8 and Table 7 of the datasheet - distinct from the larger 4.4 mm × 5.0 mm TSSOP option used by other family members.

AD7879-1WACPZ-RL Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Package/Case:: 16-VQFN Exposed Pad, CSP

Touchscreen:: 4 Wire Resistive

Resolution (Bits):: 12 b

Interface:: I2C, Serial

Voltage Reference:: External

Voltage - Supply:: 1.6V ~ 3.6V

Current - Supply:: -

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 16-LFCSP-VQ (4x4)

AD7879-1WACPZ-RL FAQ

1.How can I place an order for AD7879-1WACPZ-RL through Aetrix?

Please submit a Request for Quotation (RFQ) for AD7879-1WACPZ-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 AD7879-1WACPZ-RL reliable?

The price and inventory of AD7879-1WACPZ-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7879-1WACPZ-RL is usually 5 days.

3.What payment methods are accepted for AD7879-1WACPZ-RL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7879-1WACPZ-RL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD7879-1WACPZ-RL?

AD7879-1WACPZ-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD7879-1WACPZ-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 AD7879-1WACPZ-RL?

For technical support, including AD7879-1WACPZ-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7879-1WACPZ-RL requirements.

6.How does Aetrix verify that AD7879-1WACPZ-RL is sourced from the original manufacturer or authorized distributors?

All AD7879-1WACPZ-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 AD7879-1WACPZ-RL meets industry standards.

7.What is the process for return or replacement of AD7879-1WACPZ-RL?

All AD7879-1WACPZ-RL units undergo pre-shipment inspection (PSI). If there is an issue with AD7879-1WACPZ-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 AD7879-1WACPZ-RL part is unused and in its original packaging.

Return procedure for AD7879-1WACPZ-RL:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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