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Analog Devices Inc. AD7879WACPZ-RL
- Part No.:
- AD7879WACPZ-RL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Touch Screen Controllers
- Package:
- 16-VQFN Exposed Pad, CSP
- Datasheet:
-
AD7879WACPZ-RL.pdf
- Description:
- IC SCREEN CNTRL 12BIT 16LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,025
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Product details
Overview
AD7879WACPZ-RL from Analog Devices is a 12-bit SAR ADC touch screen controller with integrated 4-wire resistive touchscreen interface, 1.6 V to 3.6 V single-supply operation, 105 kSPS throughput, median/averaging noise filtering, and touch-pressure measurement capability - used in automotive infotainment displays and handheld medical devices for precise coordinate acquisition.
For engineers reviewing the AD7879WACPZ-RL datasheet, AD7879WACPZ-RL pinout, AD7879WACPZ-RL application, or AD7879WACPZ-RL equivalent, key selection considerations include its dual SPI/I²C interface support (via variant), programmable AUX/VBAT/GPIO terminal, PENIRQ/INT/DAV interrupt modes, and automotive-qualified 4 mm × 4 mm LFCSP package with exposed pad thermal management.
Technical Context
The AD7879WACPZ-RL integrates a 12-bit SAR ADC with on-chip track-and-hold, 6 Ω X+/Y+ switch on-resistance, and a 6-to-1 analog multiplexer supporting X/Y position, temperature, auxiliary input, battery monitor, and touch-pressure measurement. Its automatic conversion sequencer operates in master or slave mode with user-programmable acquisition time and first-conversion delay.
It implements dual-stage digital preprocessing: a programmable median filter followed by up to 16-sample averaging per channel, both configurable via control registers. The device supports ratiometric or single-ended touchscreen measurements, with reference selection (VCC or touchscreen excitation) controlled by SER/DFR bit in Control Register 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC with no missing codes - ensures monotonic position reporting across full touchscreen range. |
| Throughput Rate | 105 kSPS - enables sub-10 µs per conversion for responsive multi-touch gesture detection. |
| Supply Range | 1.6 V to 3.6 V - compatible with Li-ion battery systems and low-voltage microcontrollers without level-shifting. |
| Touch-Pressure Measurement | Supported via contact resistance calculation - provides analog feedback for stylus pressure sensitivity in drawing applications. |
| Shutdown Current | ≤6 µA - extends battery life in always-on portable devices during idle screen periods. |
| Interface Options | SPI (AD7879W) or I²C (AD7879-1W) - selectable by part variant; AD7879WACPZ-RL uses SPI with CS/DIN/DOUT/SCL pins. |
| Temperature Accuracy | ±2°C over −40°C to +85°C - calibrated at 25°C, suitable for cabin-temperature monitoring in automotive HUDs. |
Pinout & Package
AD7879WACPZ-RL is housed in a 16-lead, 4 mm × 4 mm LFCSP package with exposed thermal pad (soldered to ground plane). Pin functions are validated per Analog Devices Rev. 0 datasheet Figures 7–8 and Table 7.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC/REF (Pin 15) | Power supply and ADC reference input | Single 1.6–3.6 V rail powers logic and serves as default ADC reference; enables ratiometric touchscreen measurement when used with excitation voltage. |
| X+, X−, Y+, Y− (Pins 16, 4, 1, 5) | Touchscreen analog interface terminals | Drive and sense 4-wire resistive touch panels; X+/Y+ exhibit 6 Ω on-resistance, X−/Y− exhibit 5 Ω - minimizes position error from switch IR drop. |
| AUX/VBAT/GPIO (Pin 13) | Programmable multifunction terminal | Configurable as 0.5–5 V battery monitor input, auxiliary ADC channel, or digital I/O - eliminates need for external supervisor or GPIO expander. |
| PENIRQ/INT/DAV (Pin 12) | Multi-mode active-low interrupt output | Signals pen-down event (PENIRQ), limit violation (INT), or new data ready (DAV); internal 50 kΩ pull-up simplifies host MCU interface. |
| CS (Pin 14) | SPI chip select | Active-low enable for SPI serial communication; allows daisy-chaining or shared bus with other SPI peripherals. |
| GND (Pin 7) | Analog/digital ground reference | Common return for all analog inputs, reference, and digital I/O; must be connected to low-impedance system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | Qualified per AEC-Q100 Grade 3 (−40°C to +85°C) - certified for use in instrument clusters and center-stack displays. |
| Programmable median + averaging filters | Configurable filter depth per channel - rejects LCD noise bursts and EMI transients without sacrificing update rate. |
| Wake-up on touch | Enters active conversion only upon PENIRQ assertion - reduces average system power in battery-operated PDAs and point-of-sale terminals. |
| Touch-pressure measurement | Calculates RTOUCH from X/Y plate resistances - enables pressure-sensitive UI in medical tablets and signature capture devices. |
| Integrated temperature sensor | On-die sensor with ±2°C accuracy - monitors local IC junction temperature for thermal derating of touchscreen performance. |
Applications
| Automotive Infotainment Display | Medical Handheld Diagnostic Tablet |
|---|---|
Use Scenario: Touchscreen interface in vehicle head unit with ambient temperature variation and high EMI exposure from engine control units. IC Role / Device Role / Timing Role: Primary touchscreen digitizer and coordinate processor; performs ratiometric X/Y conversions with auto-sequenced timing and noise filtering. Use Value: 12-bit resolution and ±2°C temperature compensation maintain positional accuracy across −40°C to +85°C cabin environments. |
Use Scenario: Portable ultrasound or ECG tablet requiring reliable touch input under glove use and sterilization cycles. IC Role / Device Role / Timing Role: Touch controller with wake-on-touch and shutdown mode; manages AUX input for battery voltage monitoring and GPIO for peripheral enable. Use Value: ≤6 µA shutdown current extends runtime between charges; PENIRQ-triggered wake avoids continuous polling power loss. |
| Industrial HMI Panel | Smart Point-of-Sale Terminal |
Use Scenario: Factory-floor human-machine interface exposed to dust, vibration, and wide voltage fluctuations in 24 V DC systems. IC Role / Device Role / Timing Role: Touch acquisition subsystem with programmable acquisition time and 16-sample averaging to reject motor-drive noise. Use Value: Median filter discards spurious spikes from variable-frequency drives; 1.6 V minimum supply tolerates brownout conditions. |
Use Scenario: Retail countertop terminal with integrated battery backup and customer-facing touchscreen. IC Role / Device Role / Timing Role: Dual-role controller: digitizes touch coordinates and monitors battery health via AUX/VBAT input. Use Value: Single 0.5–5 V battery monitor channel replaces discrete supervisor IC; INT output flags low-battery condition before shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar touch screen controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7879-1WACPZ-RL | I²C interface instead of SPI; ADD0/ADD1 address pins replace CS/DIN/DOUT; identical ADC core, filters, and touchscreen functionality. | Requires I²C-capable host MCU; eliminates need for SPI bus arbitration but adds address configuration overhead. | Select AD7879-1WACPZ-RL when system uses I²C exclusively and board layout favors smaller signal count over interface flexibility. |
| TSC2007IPWR | 12-bit SAR ADC with integrated charge pump for higher touchscreen drive strength; no temperature sensor; 2.7–3.6 V supply only. | Lacks automotive qualification and shutdown current spec <6 µA; optimized for consumer-grade portable electronics. | Choose TSC2007IPWR for cost-sensitive non-automotive designs where higher drive current (>1 mA) is required for large-format screens. |
Compared with AD7879WACPZ-RL, AD7879-1WACPZ-RL offers identical analog performance but mandates I²C infrastructure, while TSC2007IPWR trades automotive compliance and ultra-low-power shutdown for higher drive capability - making AD7879WACPZ-RL optimal for safety-critical, battery-sensitive automotive and medical applications.
Availability
AD7879WACPZ-RL is available at Aetrix Electronics and suitable for automotive infotainment displays, medical handheld diagnostics, and industrial HMI panels requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for AD7879WACPZ-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 Wilmington, MA, with design centers worldwide.
The AD7879WACPZ-RL belongs to Analog Devices' precision touch controller product line, engineered specifically for automotive-qualified, low-power, noise-immune digitization of 4-wire resistive touchscreens in harsh electromagnetic environments.
FAQ
What interface protocol does the AD7879WACPZ-RL support?
The AD7879WACPZ-RL supports SPI communication with dedicated CS, DIN, DOUT, and SCL pins. It does not support I²C; that function is implemented in the pin-compatible AD7879-1W variant. The SPI interface operates up to 5 MHz with t1–t8 timing parameters defined in the datasheet, enabling deterministic low-latency touchscreen sampling.
Does the AD7879WACPZ-RL include an integrated temperature sensor?
Yes, the AD7879WACPZ-RL includes an on-die temperature sensor with ±2°C accuracy over −40°C to +85°C, calibrated at 25°C. Temperature readings are stored in dedicated result registers and can trigger INT interrupts if thresholds are exceeded - useful for thermal derating of touchscreen response in automotive cabins.
How does the AD7879WACPZ-RL handle noise from LCD backlights?
The AD7879WACPZ-RL combats LCD noise using a programmable two-stage digital filter: a median filter to discard outlier samples, followed by up to 16-sample averaging per channel. Both stages are configurable via control registers and operate in hardware, eliminating host CPU overhead while maintaining 105 kSPS throughput.
What is the purpose of the AUX/VBAT/GPIO pin on the AD7879WACPZ-RL?
The AUX/VBAT/GPIO pin (Pin 13) is a software-configurable terminal that can serve as an auxiliary ADC input (0–VCC), battery monitor (0.5–5 V), or general-purpose digital I/O. This multifunction capability reduces BOM count by consolidating sensing, supervision, and control functions into a single pin on the AD7879WACPZ-RL.
Is the AD7879WACPZ-RL qualified for automotive applications?
Yes, the AD7879WACPZ-RL is AEC-Q100 Grade 3 qualified (−40°C to +85°C), with tested reliability including ESD ratings of 15 kV air discharge on touchscreen pins and 4 kV HBM on digital I/O. Its 6 µA shutdown current, ratiometric measurement mode, and integrated noise filtering make it suitable for automotive infotainment and digital cluster applications.
AD7879WACPZ-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:
- 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-LFCSP-VQ (4x4)
AD7879WACPZ-RL FAQ
1.How can I place an order for AD7879WACPZ-RL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7879WACPZ-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 AD7879WACPZ-RL reliable?
The price and inventory of AD7879WACPZ-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7879WACPZ-RL is usually 5 days.
3.What payment methods are accepted for AD7879WACPZ-RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7879WACPZ-RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7879WACPZ-RL?
AD7879WACPZ-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7879WACPZ-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 AD7879WACPZ-RL?
For technical support, including AD7879WACPZ-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7879WACPZ-RL requirements.
6.How does Aetrix verify that AD7879WACPZ-RL is sourced from the original manufacturer or authorized distributors?
All AD7879WACPZ-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 AD7879WACPZ-RL meets industry standards.
7.What is the process for return or replacement of AD7879WACPZ-RL?
All AD7879WACPZ-RL units undergo pre-shipment inspection (PSI). If there is an issue with AD7879WACPZ-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 AD7879WACPZ-RL part is unused and in its original packaging.
Return procedure for AD7879WACPZ-RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7879WACPZ-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
Texas Instruments
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