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Analog Devices Inc. AD7143ACPZ-1REEL
- Part No.:
- AD7143ACPZ-1REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Sensor and Detector Interfaces
- Package:
- 16-VQFN Exposed Pad, CSP
- Datasheet:
-
AD7143ACPZ-1REEL.pdf
- Description:
- IC CONV CAP-TO-DGTL PROG 16LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,501
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Product details
Overview
AD7143ACPZ-1REEL from Analog Devices is a programmable capacitance-to-digital converter (CDC) IC designed for capacitive touch sensing in portable user interfaces. It features 8 sensor input channels, 16-bit resolution, better than 1 fF sensitivity, 25 ms update rate at full sequence, and on-chip environmental calibration logic. It serves as the core signal acquisition and preprocessing unit in touch-enabled handheld devices such as smartphones and multimedia players.
For engineers reviewing the AD7143ACPZ-1REEL datasheet, AD7143ACPZ-1REEL pinout, AD7143ACPZ-1REEL application, or AD7143ACPZ-1REEL equivalent, key selection considerations include its I²C-compatible serial interface with separate VDRIVE, interrupt-driven host notification, low-power mode operation (50 μA), 4 mm × 4 mm LFCSP-VQ package, and integrated automatic threshold adaptation for robust touch detection across temperature and humidity variations.
Technical Context
The AD7143ACPZ-1REEL implements an on-chip 16-bit sigma-delta (∑-Δ) CDC with 250 kHz excitation source and switch-matrix routing of eight CIN inputs. Its conversion sequencer supports configurable decimation rates (128 or 256), enabling trade-offs between noise performance (0.5 codes RMS at decimation = 256) and update speed (25 ms per full 8-stage sequence).
It integrates dedicated digital calibration logic-including ambient compensation engine, adaptive threshold/sensitivity control, and 528-word on-chip RAM-to autonomously correct for parasitic capacitance drift (up to 40 pF per input), temperature-induced offset, and humidity effects-without host intervention during normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit output with no missing codes; enables sub-femtofarad change detection for high-precision touch discrimination. |
| Update Rate | 25 ms per full 8-channel sequence; ensures responsive user feedback in real-time touch interfaces. |
| Sensor Inputs | 8 independent CIN channels (CIN0–CIN7); supports mixed topologies including buttons, scroll bars, and wheels. |
| Supply Voltage | 2.6 V to 3.6 V; compatible with single-cell Li-ion and regulated 3.3 V system rails. |
| Operating Current | <1 mA full power; 50 μA low power mode (400 ms delay); extends battery life in portable applications. |
| Interface | I²C-compatible with separate VDRIVE (1.65 V to 3.6 V); allows direct interfacing with diverse host voltage domains. |
| Package | 16-lead LFCSP-VQ, 4 mm × 4 mm; provides compact footprint and thermal performance suitable for space-constrained PCBs. |
Pinout & Package
AD7143ACPZ-1REEL is housed in a 16-lead, 4 mm × 4 mm LFCSP-VQ (Lead Frame Chip Scale Package – Very thin Quad) with exposed thermal pad. The package supports reflow soldering per JEDEC J-STD-020 (peak 260°C) and offers θJA = 135.7°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CIN0–CIN7 | Capacitance sensor inputs | Eight differential-capable analog inputs accepting ±2 pF sensor capacitance changes; each configurable via internal mux to positive/negative CDC input or CSHIELD. |
| SRC | Excitation source output | 250 kHz (typ.) square-wave drive signal; delivers up to 20 mA source / 50 mA sink current to sensor electrodes. |
| CSHIELD | Shield potential output | Biased at VCC/2; requires 10 nF capacitor to GND to reduce crosstalk and improve noise immunity. |
| VCC | Main supply voltage | 2.6 V to 3.6 V analog/digital core supply; powers CDC, sequencer, and calibration logic. |
| GND | Ground reference | Common return for all analog and digital circuitry; must connect directly to low-impedance ground plane. |
| VDRIVE | I²C interface voltage rail | Independent 1.65 V to 3.6 V supply for SDA/SCLK pins; decouples interface logic from core supply domain. |
| SDA | I²C bidirectional data line | Open-drain, requires external pull-up; supports standard/fast-mode I²C up to 400 kHz. |
| SCLK | I²C clock input | Open-drain, requires external pull-up; synchronous timing reference for register read/write operations. |
| INT | Programmable interrupt output | Open-drain, active-low by default; asserts on sensor activation or conversion completion to wake host MCU. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip environmental calibration | Continuous background recalibration using 528-word RAM; eliminates manual recalibration and false triggers due to humidity/temperature drift. |
| Automatic adaptive thresholds | Dynamically adjusts touch detection thresholds per channel based on baseline capacitance; maintains consistent sensitivity across aging and contamination. |
| No external RC tuning components | Self-contained excitation and conversion architecture; reduces BOM count and layout complexity versus discrete CDC solutions. |
| Configurable low-power wake-up | LP_CONV_DELAY selectable at 200/400/600/800 ms; enables <50 μA average current while retaining <25 ms response on touch event. |
| Flexible sensor topology support | Programmable CIN mux and stage registers allow independent configuration of buttons, sliders, and wheels on same device without hardware change. |
Applications
| Smartphone Front Panel Interface | Digital Still Camera Control Dial |
|---|---|
Use Scenario: Capacitive touch keys and proximity-activated display wake on smartphone bezels. IC Role / Device Role / Timing Role: Primary capacitance-to-digital converter acquiring raw sensor data and performing real-time baseline compensation before host MCU interpretation. Use Value: Enables reliable touch detection through 2 mm plastic overlay with <1 fF resolution, eliminating mechanical wear and supporting IP67 sealing. |
Use Scenario: Scroll wheel for menu navigation and exposure adjustment on compact DSLR-style cameras. IC Role / Device Role / Timing Role: High-resolution CDC capturing incremental capacitance delta across segmented electrodes to compute rotation direction and velocity. Use Value: Delivers 16-bit position data at 25 ms intervals with built-in oversampling (decimation = 256), reducing host-side filtering overhead by >70%. |
| Gaming Console Remote | TV Remote with Gesture Support |
Use Scenario: Multi-function directional pad and action buttons on wireless game controller remotes. IC Role / Device Role / Timing Role: On-device digital logic processes 8-way button states independently; reports only changed-state interrupts to conserve host polling bandwidth. Use Value: Full button functionality implemented entirely in hardware-zero host CPU cycles required for basic input, extending 2.4 GHz RF module battery life. |
Use Scenario: Proximity-sensing and swipe gesture recognition on premium TV remotes with minimal button count. IC Role / Device Role / Timing Role: CDC measures non-contact capacitance shift (≥10 mm range) using SRC-driven field modulation and slow-FIFO averaging. Use Value: Supports proximity wake + swipe detection using same electrode array, reducing layer count and bill-of-materials vs. dual-sensor implementations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitance-to-digital converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7142ACPZ-1REEL | 7-channel variant; identical architecture, register map, and calibration engine; lacks CIN7 input. | Suitable for designs requiring ≤7 sensors; same PCB footprint and firmware compatibility. | Select when sensor count is ≤7 to reduce cost without sacrificing feature set or software investment. |
| TI CAP11xx series (e.g., CAP1188) | Dedicated 8-channel QFN-based CDC with fixed thresholds; no programmable decimation or parasitic offset DACs. | Targeted at simple button-only UIs; lacks scroll/wheel support and advanced environmental compensation. | Choose for ultra-low-cost, high-volume button panels where adaptive calibration and mixed topology support are unnecessary. |
Compared with AD7142ACPZ-1REEL, AD7143ACPZ-1REEL adds one sensor channel and retains full register-level compatibility; compared with CAP1188, AD7143ACPZ-1REEL provides superior noise performance (0.5 codes RMS vs. ~3 codes), programmable decimation, and autonomous environmental compensation-critical for premium portable UIs.
Availability
AD7143ACPZ-1REEL is available at Aetrix Electronics and suitable for smartphone front panels, digital camera control dials, and gaming console remotes requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for consumer electronics production.
Supply support for AD7143ACPZ-1REEL 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 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 AD7143ACPZ-1REEL belongs to Analog Devices' Capacitive Touch Controller product line, engineered specifically for high-resolution, low-power, and environmentally robust human interface applications in portable and battery-operated systems.
FAQ
What is the primary function of the AD7143ACPZ-1REEL in a touch interface system?
The AD7143ACPZ-1REEL functions as a fully integrated capacitance-to-digital converter that acquires analog capacitance changes from up to eight external sensors, digitizes them with 16-bit resolution, and applies on-chip environmental calibration and adaptive thresholding. Unlike basic touch controllers, AD7143ACPZ-1REEL performs real-time baseline correction and stores calibration data in on-chip RAM-enabling reliable touch detection without host CPU involvement for compensation routines.
Does the AD7143ACPZ-1REEL require external passive components for basic operation?
No, the AD7143ACPZ-1REEL does not require external RC tuning components for core CDC operation. Its integrated 250 kHz excitation source and sigma-delta converter eliminate the need for external oscillators or filter networks. Only three external passives are mandatory: a 10 nF capacitor from CSHIELD to GND, and pull-up resistors on SDA and SCLK lines-making AD7143ACPZ-1REEL a true single-chip solution for capacitive sensing.
How does the AD7143ACPZ-1REEL handle environmental drift such as temperature and humidity changes?
The AD7143ACPZ-1REEL uses continuous, background environmental calibration executed automatically when sensors are idle. Its on-chip calibration engine monitors baseline capacitance across all eight inputs and updates 528 words of RAM-stored compensation parameters-correcting for parasitic shifts up to 40 pF per channel. This process occurs transparently and ensures zero false triggers or missed touches, even under rapid ambient changes-no host software or manual recalibration is needed for AD7143ACPZ-1REEL to maintain accuracy.
What power modes does the AD7143ACPZ-1REEL support, and how do they affect current consumption?
The AD7143ACPZ-1REEL supports three power modes: full power (<1 mA), low power (50 μA typical at 400 ms LP_CONV_DELAY), and full shutdown (≤15 μA). In low power mode, it dynamically reduces conversion frequency when no touch is detected-performing full 8-channel sequences only every 200–800 ms for calibration-then switches to 25 ms intervals upon touch detection. This behavior is fully hardware-managed and requires no host intervention, making AD7143ACPZ-1REEL ideal for battery-powered UIs.
Can the AD7143ACPZ-1REEL support both button and scroll wheel sensors simultaneously?
Yes, the AD7143ACPZ-1REEL supports mixed sensor topologies within a single device. Its programmable sequencer, per-channel offset/sensitivity registers, and flexible CIN mux allow independent configuration of CIN0–CIN7 as discrete buttons, linear sliders, or rotary wheels. For example, CIN0–CIN3 can be assigned to a 4-way directional pad while CIN4–CIN7 form a scroll wheel-each with tailored decimation, averaging, and threshold settings-all managed via AD7143ACPZ-1REEL's internal register map without external logic.
AD7143ACPZ-1REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-VQFN Exposed Pad, CSP
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Capacitance-to-Digital Converter
- Input Type:
- Logic
- Output Type:
- Logic
- Current - Supply:
- 1 mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-LFCSP-VQ (4x4)
AD7143ACPZ-1REEL FAQ
1.How can I place an order for AD7143ACPZ-1REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7143ACPZ-1REEL 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 AD7143ACPZ-1REEL reliable?
The price and inventory of AD7143ACPZ-1REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7143ACPZ-1REEL is usually 5 days.
3.What payment methods are accepted for AD7143ACPZ-1REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7143ACPZ-1REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7143ACPZ-1REEL?
AD7143ACPZ-1REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7143ACPZ-1REEL 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 AD7143ACPZ-1REEL?
For technical support, including AD7143ACPZ-1REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7143ACPZ-1REEL requirements.
6.How does Aetrix verify that AD7143ACPZ-1REEL is sourced from the original manufacturer or authorized distributors?
All AD7143ACPZ-1REEL 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 AD7143ACPZ-1REEL meets industry standards.
7.What is the process for return or replacement of AD7143ACPZ-1REEL?
All AD7143ACPZ-1REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7143ACPZ-1REEL, 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 AD7143ACPZ-1REEL part is unused and in its original packaging.
Return procedure for AD7143ACPZ-1REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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