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Analog Devices Inc. AD7151BRMZ-REEL
- Part No.:
- AD7151BRMZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Sensor and Detector Interfaces
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7151BRMZ-REEL.pdf
- Description:
- IC CAP CONV 1CH ULT LP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,753
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Product details
Overview
AD7151BRMZ-REEL from Analog Devices is an ultra-low-power, single-channel capacitance-to-digital converter (CDC) designed for proximity sensing in battery-powered and space-constrained systems. It delivers 10 ms response time, 1 fF sensitivity, adaptive environmental compensation, and operates from 2.7 V to 3.6 V at just 70 μA - enabling contactless switching in handheld consumer electronics.
For engineers reviewing the AD7151BRMZ-REEL datasheet, AD7151BRMZ-REEL pinout, AD7151BRMZ-REEL application, or AD7151BRMZ-REEL equivalent, key selection criteria include its 10-lead MSOP package, I²C-compatible serial interface, standalone detection flag output (OUT), and programmable CAPDAC for sensor offset compensation up to 10 pF.
Technical Context
The AD7151BRMZ-REEL integrates a second-order sigma-delta (Σ-Δ) capacitance-to-digital converter with a third-order digital filter, excitation source (15.4–16.3 kHz), and on-chip CAPDAC (0–12.5 pF range, 200 fF LSB). Its adaptive threshold algorithm continuously updates detection thresholds based on exponential averaging of CDC data over configurable time constants (2–65,536 cycles).
It supports two operational modes: standalone (fixed settings, direct OUT assertion) and microcontroller-controlled (full register access via I²C). The device features built-in power supply monitoring (2.45–2.65 V trip), power-down timer, hysteresis control, and timeout logic to prevent false triggers during large capacitance transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7 V to 3.6 V - compatible with standard Li-ion and coin-cell battery rails without external regulation. |
| Quiescent Current | 70 μA typical - enables multi-year operation in always-on proximity sensors powered by CR2032 cells. |
| Conversion Time | 10 ms - ensures sub-100 Hz update rate for responsive human-interface detection. |
| Sensitivity | 1 fF resolution - detects minute capacitance shifts from sub-millimeter object approach or material thickness variation. |
| Sensor Capacitance Range | 0 pF to 13 pF (with CAPDAC offset) - accommodates PCB trace, flex foil, and embedded metal pad sensors. |
| Operating Temperature | −40°C to +85°C - validated for industrial and automotive cabin environments. |
| I²C Interface Speed | Up to 400 kHz - supports fast configuration and status polling without MCU resource contention. |
Pinout & Package
AD7151BRMZ-REEL is housed in a 10-lead MSOP package (3.0 mm × 4.9 mm, 0.5 mm pitch), optimized for compact PCB layouts and automated assembly. Thermal resistance θJA = 206°C/W supports operation without heatsinking in low-power applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Primary return path for all analog and digital currents; requires low-impedance connection to system ground plane. |
| VDD (Pin 2) | Power supply input | Must be decoupled with ≥0.1 μF X7R ceramic capacitor placed within 2 mm of pin to suppress high-frequency noise. |
| NC (Pins 3, 5, 8) | No-connect | Must remain unconnected or tied to GND per layout guidelines; no internal circuitry attached. |
| CIN (Pin 4) | CDC capacitive input | High-impedance node connected to one plate of floating sensor; sensitive to parasitic CGND ≤ 150 pF and RGND ≤ 15 MΩ. |
| EXC (Pin 6) | Excitation output | Drives AC signal (±VDD/2, ~16 kHz) to second sensor plate; slew-rate limited for EMC compliance. |
| OUT (Pin 7) | Digital proximity flag | Active-high open-drain output; asserts when capacitance crosses programmed threshold - directly drives LED or MCU interrupt. |
| SCL (Pin 9) | I²C clock input | Requires external pull-up resistor (typically 4.7 kΩ); supports standard-mode I²C timing (tHIGH ≥ 0.6 μs, tLOW ≥ 1.3 μs). |
| SDA (Pin 10) | I²C bidirectional data | Open-drain interface; shares same pull-up as SCL; supports read/write of 24 registers including Data, Sensitivity, and CAPDAC. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive threshold algorithm | Automatically rejects slow drift from humidity/temperature while detecting fast proximity events - eliminates manual recalibration in field-deployed devices. |
| Programmable CAPDAC (0–12.5 pF) | Compensates for fixed sensor offset (e.g., PCB stray capacitance), extending effective measurement range beyond native 4 pF full-scale. |
| AutoCAPDAC adjustment | Self-adjusts CAPDAC value when CDC data exceeds 25% or 75% of full scale - maintains optimal conversion linearity across sensor aging or contamination. |
| Configurable timeout logic | Prevents prolonged false-negative states during large capacitance transitions by forcing threshold update after user-defined conversion count. |
| EMC-optimized excitation | Slew-rate limited 16 kHz square wave minimizes harmonic emissions - simplifies CE/FCC radiated emissions testing for end equipment. |
Applications
| Smartphone Proximity Sensing | Industrial Level Detection |
|---|---|
|
Use Scenario: Detects user's ear proximity during calls to disable touchscreen and backlight. IC Role / Device Role / Timing Role: Capacitance-to-digital converter measuring dynamic shift in electrode-to-ear capacitance; 10 ms response ensures immediate display blanking. Use Value: Eliminates mechanical IR sensors, reducing BOM cost and board area while improving reliability in dusty/humid conditions. |
Use Scenario: Monitors liquid level in non-metallic tanks using external capacitive electrodes. IC Role / Device Role / Timing Role: Single-channel CDC interfaced to microcontroller; adaptive threshold compensates for temperature-induced dielectric constant changes in fluid. Use Value: Enables maintenance-free level sensing without tank penetration or calibration drift over years of operation. |
| Automotive Touchless Door Handle | Medical Wearable Contact Detection |
|
Use Scenario: Triggers door unlock when hand approaches handle, before physical contact. IC Role / Device Role / Timing Role: Proximity detector with hysteresis-enabled OUT flag; CAPDAC offsets mounting bracket capacitance. Use Value: Supports IP67-rated sealed enclosures with no exposed buttons or apertures - improves ingress protection and aesthetics. |
Use Scenario: Confirms proper skin contact for ECG or pulse oximetry sensors before signal acquisition. IC Role / Device Role / Timing Role: Low-power CDC verifying electrode-skin coupling; 70 μA quiescent current extends wearable battery life. Use Value: Prevents false diagnostics from poor electrode placement - improves clinical accuracy and user guidance feedback. |
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 |
|---|---|---|---|
| AD7150BRMZ-REEL | 2-channel CDC, identical architecture and specs per channel; 12-lead MSOP package. | Supports dual-sensor systems (e.g., gesture direction detection); requires additional PCB area and routing. | Select AD7150BRMZ-REEL only if simultaneous dual-capacitance measurement is required - AD7151BRMZ-REEL offers lower cost and smaller footprint for single-point sensing. |
| TI FDC1004DGST | 4-channel CDC with integrated shield driver; 16-bit resolution; higher 115 μA supply current. | Better suited for high-precision, multi-electrode systems with guard/shield requirements; lacks adaptive threshold engine. | Choose TI FDC1004DGST when shielded sensor layouts or >12-bit resolution are mandatory; AD7151BRMZ-REEL provides superior power efficiency and autonomous operation for basic proximity flags. |
Compared with AD7150BRMZ-REEL and TI FDC1004DGST, the AD7151BRMZ-REEL uniquely combines ultra-low power (70 μA), autonomous adaptive thresholding, and minimal 10-lead MSOP packaging - making it optimal for cost-sensitive, single-node proximity applications where firmware overhead and board space are constrained.
Availability
AD7151BRMZ-REEL is available at Aetrix Electronics and suitable for smartphone proximity sensing, industrial level detection, automotive touchless interfaces, and medical wearable contact verification requiring stable component supply and long-term manufacturability.
Supply support for AD7151BRMZ-REEL 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 AD7151BRMZ-REEL belongs to Analog Devices' precision capacitance sensing product line, engineered specifically for robust, low-power proximity and position detection in consumer, industrial, and automotive systems where environmental stability and small form factor are critical.
FAQ
What is the primary function of the AD7151BRMZ-REEL in a proximity sensing system?
The AD7151BRMZ-REEL functions as a dedicated capacitance-to-digital converter that measures minute changes in sensor capacitance (down to 1 fF) and converts them into a digital decision - either asserting the OUT pin for immediate proximity detection or providing raw 12-bit data via I²C. Its integrated adaptive threshold engine autonomously distinguishes real user interaction from environmental drift, eliminating the need for host MCU intervention in basic use cases.
Can the AD7151BRMZ-REEL operate without a microcontroller?
Yes, the AD7151BRMZ-REEL supports standalone operation using factory-default register settings. In this mode, it continuously monitors the CIN–EXC sensor, applies adaptive thresholding, and asserts the OUT pin whenever proximity is detected - requiring only VDD, GND, and the sensor. No I²C interface or firmware is needed, making it ideal for simple, low-cost contactless switches.
How does the CAPDAC in the AD7151BRMZ-REEL improve sensor performance?
The CAPDAC in the AD7151BRMZ-REEL provides programmable offset compensation (0–12.5 pF, 200 fF steps) to nullify fixed parasitic capacitance from PCB traces or mounting structures. This allows the core CDC to operate within its optimal 4 pF full-scale range even when total sensor capacitance reaches 13 pF - preserving resolution, linearity, and immunity to ground leakage effects.
What is the significance of the 10 ms conversion time specification for the AD7151BRMZ-REEL?
The 10 ms conversion time defines the maximum interval between successive capacitance measurements under default settings. This enables a 100 Hz effective sampling rate - sufficient for human-motion detection (e.g., hand approach) while maintaining ultra-low power consumption. The time is fixed per conversion cycle and forms the basis for timeout, averaging, and hysteresis timing parameters in the AD7151BRMZ-REEL's adaptive logic.
Does the AD7151BRMZ-REEL require external components for basic operation?
For basic standalone operation, the AD7151BRMZ-REEL requires only a 0.1 μF decoupling capacitor on VDD and a two-terminal capacitive sensor connected between CIN and EXC. The OUT pin can drive an LED directly (with current-limiting resistor) or interface to a microcontroller interrupt. No external clock, reference, or bias components are needed - the excitation source, ADC, and logic are fully integrated.
AD7151BRMZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Capacitance-to-Digital Converter
- Input Type:
- Voltage
- Output Type:
- Digital
- Current - Supply:
- 70 µA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
AD7151BRMZ-REEL FAQ
1.How can I place an order for AD7151BRMZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7151BRMZ-REEL 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 AD7151BRMZ-REEL reliable?
The price and inventory of AD7151BRMZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7151BRMZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7151BRMZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7151BRMZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7151BRMZ-REEL?
AD7151BRMZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7151BRMZ-REEL 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 AD7151BRMZ-REEL?
For technical support, including AD7151BRMZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7151BRMZ-REEL requirements.
6.How does Aetrix verify that AD7151BRMZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7151BRMZ-REEL 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 AD7151BRMZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7151BRMZ-REEL?
All AD7151BRMZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7151BRMZ-REEL, 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 AD7151BRMZ-REEL part is unused and in its original packaging.
Return procedure for AD7151BRMZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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