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Analog Devices Inc. AD7143ACPZ-1500RL7
- Part No.:
- AD7143ACPZ-1500RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Sensor and Detector Interfaces
- Package:
- 16-VQFN Exposed Pad, CSP
- Datasheet:
-
AD7143ACPZ-1500RL7.pdf
- Description:
- IC CTLR PROGRAMMABLE CDC 16LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,230
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Product details
Overview
AD7143ACPZ-1500RL7 from Analog Devices is a programmable capacitance-to-digital converter (CDC) IC designed for capacitive touch sensor interfaces in portable electronics. It features 8 sensor input channels, 16-bit sigma-delta conversion, better than 1 fF resolution, and on-chip environmental calibration logic. It operates from 2.6 V to 3.6 V and supports I²C communication with separate VDRIVE for 1.65 V–3.6 V interface compatibility.
For engineers reviewing the AD7143ACPZ-1500RL7 datasheet, AD7143ACPZ-1500RL7 pinout, AD7143ACPZ-1500RL7 application, or AD7143ACPZ-1500RL7 equivalent, key selection considerations include update rate (25 ms max), low-power mode current (50 μA), automatic adaptive thresholding, interrupt-driven host notification, and LFCSP-VQ 4 mm × 4 mm package compatibility with high-density PCB layouts.
Technical Context
The AD7143ACPZ-1500RL7 integrates an excitation source (240 kHz ±2.5%), 16-bit sigma-delta CDC, switch matrix routing CIN0–CIN7 inputs, and on-chip RAM (528 words) for real-time environmental compensation. Its sequencer supports configurable conversion order and decimation rates (128 or 256), enabling trade-offs between noise (0.5 codes RMS at 256) and speed (3.072 ms/stage).
It implements shunt-method capacitance sensing with CSHIELD output (VCC/2 bias, 10 nF to GND) and SRC excitation (20 mA source/50 mA sink). Calibration runs autonomously during idle periods, compensating for temperature/humidity drift without host intervention-critical for reliable button, scroll bar, or wheel detection in consumer handhelds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes; enables sub-femtofarad change detection for high-precision touch localization. |
| Update Rate | 25 ms maximum at full sequence (8 stages); ensures responsive user interface feedback in multimedia controls. |
| Input Channels | 8 independent CIN inputs (CIN0–CIN7); supports mixed topologies-buttons, sliders, wheels-on single IC. |
| Supply Voltage | 2.6 V to 3.6 V; matches Li-ion battery and regulated 3.3 V rail operation without level-shifting. |
| Low Power Current | 50 μA in low-power mode (400 ms delay); extends battery life in always-on touch interfaces like remote controls. |
| I²C Interface | 400 kHz max clock, VDRIVE-independent (1.65 V–3.6 V); allows direct connection to 1.8 V or 3.3 V microcontrollers. |
| Calibration Logic | On-chip auto-recalibration engine with 528-word RAM; eliminates manual recalibration and false triggers due to ambient drift. |
Pinout & Package
AD7143ACPZ-1500RL7 is housed in a 16-lead, 4 mm × 4 mm LFCSP-VQ package with exposed thermal pad (EP). The package supports fine-pitch SMT assembly and provides low thermal resistance (θJA = 135.7°C/W) for sustained operation in compact enclosures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CIN0–CIN7 | Capacitance sensor inputs | Eight differential-capable analog inputs; each configurable via register to connect to positive/negative CDC input or CSHIELD for crosstalk suppression. |
| SRC | Excitation source output | 240 kHz AC drive signal (VCC amplitude); delivers up to 50 mA sink current to drive sensor electrodes directly. |
| CSHIELD | Shield bias output | Provides VCC/2 reference voltage; requires 10 nF capacitor to GND to stabilize shield potential and reduce noise coupling. |
| VCC / GND | Power supply / reference | VCC powers analog/digital core (2.6–3.6 V); GND is common reference for all circuitry-must tie to solid ground plane. |
| VDRIVE | I²C interface voltage rail | Decouples serial interface logic levels from core supply; enables interoperability with 1.8 V or 3.3 V hosts without external translators. |
| SCLK / SDA | I²C clock/data lines | Open-drain, require pull-up resistors; support standard/fast-mode I²C up to 400 kHz with 300 ns rise/fall time compliance. |
| INT | Interrupt output | Open-drain, active-low interrupt; signals host processor on sensor activation or conversion completion-reduces polling overhead. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable CDC sequencer | Full register control over channel order, decimation, averaging, and stage-specific offsets-enables custom sensor mapping without firmware changes. |
| Automatic environmental calibration | Continuous background compensation using on-chip RAM; maintains stable thresholds across −40°C to +85°C and varying humidity without host CPU involvement. |
| Adaptive threshold & sensitivity | Dynamically adjusts detection limits per channel based on baseline capacitance drift; prevents false touches during temperature transients or condensation. |
| No external RC tuning components | Eliminates discrete timing resistors/capacitors; reduces BOM count and layout sensitivity-ideal for space-constrained mobile PCBs. |
| Low-power wake-up architecture | Switches from 50 μA idle current to full-speed 25 ms updates on touch detection; achieves >95% power reduction during standby in handheld devices. |
Applications
| Smartphone Touch Interface | Media Player Control Panel |
|---|---|
Use Scenario: Capacitive scroll wheel and 8-way navigation buttons integrated into smartphone bezel for one-handed UI navigation. IC Role / Device Role / Timing Role: CDC front-end converting finger-induced capacitance shifts into digital position data; handles real-time proximity detection and debounced button state reporting via INT. Use Value: Enables mechanical-free, sealed front panel design with IP54-rated durability and <25 ms response latency for tactile feedback synchronization. | Use Scenario: Scroll bar and play/pause/volume buttons on portable music player housing, operating under plastic overlay. IC Role / Device Role / Timing Role: Primary touch controller managing multi-sensor event sequencing; uses internal RAM to store calibrated baselines and suppress false triggers from sweat or pocket contact. Use Value: Delivers consistent performance across battery voltage drop (2.6–3.6 V) and ambient temperature swings (−40°C to +85°C) without recalibration. |
| TV Remote Control | Gaming Console Peripheral |
Use Scenario: Slim-profile remote with capacitive touch keys and circular slider for menu navigation, powered by coin cell. IC Role / Device Role / Timing Role: Low-power CDC managing periodic 400 ms ambient sampling and burst-mode 25 ms updates on touch; INT pin wakes host MCU only when needed. Use Value: Extends CR2032 battery life to >12 months by reducing average current to 50 μA during idle and eliminating continuous polling. | Use Scenario: Wireless gamepad with capacitive D-pad and action buttons, requiring ESD-hardened, jitter-free input detection. IC Role / Device Role / Timing Role: Dedicated touch acquisition IC providing noise-immune, 1 fF-resolution sensing; CSHIELD and SRC drive minimize RF interference from 2.4 GHz radio co-location. Use Value: Achieves <10 ms end-to-end latency from finger contact to host-reported event, meeting gaming responsiveness requirements. |
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 |
|---|---|---|---|
| CY8C201A0-SX24 | CapSense® PSoC-based solution with integrated MCU; requires firmware development; 12-bit resolution; no on-chip RAM for calibration storage. | Best suited for designs needing embedded processing (e.g., gesture decoding) but lacks autonomous calibration engine of AD7143ACPZ-1500RL7. | Select CY8C201A0-SX24 only if host MCU resources are unavailable and local preprocessing is required. |
| AT42QT1070-SSUR | 7-channel QTouch® IC; fixed 16-bit resolution; no programmable sequencer or decimation control; 1.8–5.5 V supply range. | Targeted at cost-sensitive button-only applications; lacks scroll wheel support and adaptive thresholding logic present in AD7143ACPZ-1500RL7. | Choose AT42QT1070-SSUR for simple 7-button interfaces where configurability and environmental robustness are secondary to BOM cost. |
Compared with CY8C201A0-SX24 and AT42QT1070-SSUR, AD7143ACPZ-1500RL7 uniquely combines autonomous calibration, programmable 8-channel sequencing, and ultra-low 50 μA idle current-making it optimal for high-reliability, mixed-topology touch interfaces in battery-powered consumer devices.
Availability
AD7143ACPZ-1500RL7 is available at Aetrix Electronics and suitable for smartphone bezel interfaces, portable media player control panels, TV remote controls, and gaming peripheral designs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AD7143ACPZ-1500RL7 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.
The AD7143ACPZ-1500RL7 belongs to Analog Devices' Capacitance Sensing Solutions product line, engineered specifically for robust, low-power, and software-light capacitive touch interfaces in portable consumer electronics.
FAQ
What is the primary function of the AD7143ACPZ-1500RL7 in a touch interface system?
The AD7143ACPZ-1500RL7 serves as a dedicated capacitance-to-digital converter that acquires analog capacitance changes from up to eight external sensors (e.g., buttons, scroll bars), digitizes them with 16-bit resolution, and delivers calibrated results via I²C. Its on-chip logic handles environmental compensation, threshold adaptation, and interrupt generation-offloading these tasks from the host MCU. This makes AD7143ACPZ-1500RL7 ideal for resource-constrained embedded systems requiring reliable, low-latency touch detection without complex driver software.
Does the AD7143ACPZ-1500RL7 require external passive components for basic operation?
No, the AD7143ACPZ-1500RL7 requires no external RC tuning components for core CDC operation. Only three mandatory passives are needed: a 10 nF capacitor from CSHIELD to GND, and pull-up resistors on SDA and SCLK lines. The excitation source (SRC), shield bias (CSHIELD), and calibration logic are fully integrated-eliminating timing resistors, external references, or trimming capacitors typically found in discrete capacitive sensing solutions.
How does the AD7143ACPZ-1500RL7 manage power consumption in battery-powered devices?
The AD7143ACPZ-1500RL7 offers three operating modes: full power (<1 mA), low power (50 μA typical), and full shutdown (≤15 μA). In low power mode, it automatically extends the conversion interval to 200–800 ms when sensors are idle, then switches to 25 ms updates upon touch detection. This adaptive behavior-controlled entirely by on-chip logic-reduces average current by >95% versus continuous sampling, significantly extending battery life in remotes, wearables, and handhelds without host intervention.
Can the AD7143ACPZ-1500RL7 support both button and slider/wheel sensors simultaneously?
Yes, the AD7143ACPZ-1500RL7 natively supports mixed sensor topologies. Its 8-input switch matrix and programmable sequencer allow independent configuration of each CINx channel-including offset, sensitivity, and connection polarity (positive/negative input or CSHIELD). Buttons can be set for fast, debounced status reporting, while sliders or wheels use sequential sampling and host-side interpolation. No hardware change is needed; only register programming distinguishes function-making AD7143ACPZ-1500RL7 suitable for unified touch interfaces in smartphones or media players.
What is the role of the CSHIELD pin on the AD7143ACPZ-1500RL7, and how must it be connected?
The CSHIELD pin on the AD7143ACPZ-1500RL7 outputs a VCC/2 bias voltage used to drive guard traces or shield layers adjacent to sensor electrodes. Its purpose is to reduce parasitic coupling and improve noise immunity-especially critical in multi-layer PCBs or dense layouts. It must be connected to a 10 nF ceramic capacitor tied to GND; omitting this capacitor causes instability and degraded SNR. CSHIELD is not optional: proper termination ensures accurate 1 fF resolution and reliable operation under ESD or RF interference.
AD7143ACPZ-1500RL7 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-1500RL7 FAQ
1.How can I place an order for AD7143ACPZ-1500RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7143ACPZ-1500RL7 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-1500RL7 reliable?
The price and inventory of AD7143ACPZ-1500RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7143ACPZ-1500RL7 is usually 5 days.
3.What payment methods are accepted for AD7143ACPZ-1500RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7143ACPZ-1500RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7143ACPZ-1500RL7?
AD7143ACPZ-1500RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7143ACPZ-1500RL7 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-1500RL7?
For technical support, including AD7143ACPZ-1500RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7143ACPZ-1500RL7 requirements.
6.How does Aetrix verify that AD7143ACPZ-1500RL7 is sourced from the original manufacturer or authorized distributors?
All AD7143ACPZ-1500RL7 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-1500RL7 meets industry standards.
7.What is the process for return or replacement of AD7143ACPZ-1500RL7?
All AD7143ACPZ-1500RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7143ACPZ-1500RL7, 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-1500RL7 part is unused and in its original packaging.
Return procedure for AD7143ACPZ-1500RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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