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NXP Semiconductors FXLS8971CFR1
- Part No.:
- FXLS8971CFR1
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 12-LQFN Exposed Pad
- Datasheet:
-
FXLS8971CFR1.pdf
- Description:
- FXLS8971CFR1
- Quantity:
- Payment:
- Shipping:
Inventory:1,238
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Product details
Overview
FXLS8971CFR1 from NXP Semiconductors is a 3-axis MEMS accelerometer engineered for ultra-low-power motion wake-up and precision inertial sensing in industrial IoT and medical devices. It delivers ±2/4/8/16 g full-scale ranges, 12-bit acceleration data resolution, 230 µg/√Hz noise density in high-performance mode, and operates across –40 °C to +105 °C. It enables asset tracking, tilt measurement, and patient activity monitoring with autonomous orientation detection and integrated FIFO.
For engineers reviewing the FXLS8971CFR1 datasheet, FXLS8971CFR1 pinout, FXLS8971CFR1 application, or FXLS8971CFR1 equivalent, this page provides verified technical context, validated pin functions, confirmed low-power operating modes (≤1 µA at 6.25 Hz), real-world use-value of its 144-byte FIFO and SDCD event engine, and two rigorously cross-checked alternative accelerometers for motion-sensing designs.
Technical Context
The FXLS8971CFR1 integrates dual-mode operation-High-Performance Mode (HPM) with 230 µg/√Hz noise and Low-Power Mode (LPM) drawing ≤1 µA at 6.25 Hz ODR-enabling adaptive power/performance trade-offs. Its digital signal path includes programmable decimation, 12-bit vector magnitude calculation, and autonomous Sensor Data Change Detection (SDCD) for motion/no-motion, freefall, and high-g/low-g event classification without host intervention.
It features a 144-byte FIFO supporting LIFO/FIFO read order, configurable trigger input for external synchronization, and dual-interface support: I²C up to 1 MHz and 3-/4-wire SPI up to 4 MHz. The device implements post-board-mount offset stability of ±30 mg and TCO of ±0.15 mg/°C, ensuring reliable performance after reflow in harsh thermal environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-scale range | ±2/4/8/16 g - user-selectable via register; determines LSB scaling (e.g., 1024 LSB/g at ±2 g) and dynamic range for vibration or tilt sensing |
| Output resolution | 12-bit acceleration data - supports precise motion quantization down to 0.98 mg/LSB in ±2 g mode |
| Current consumption | ≤1 µA in LPM at 6.25 Hz ODR - enables multi-year battery life in always-on edge nodes |
| Noise spectral density | 230 µg/√Hz (typ, HPM, ±4 g) - defines minimum detectable acceleration change in high-fidelity applications |
| Operating temperature | –40 °C to +105 °C - qualified for industrial and medical equipment deployed in uncontrolled ambient environments |
| FIFO depth | 144 bytes - stores up to 32 X/Y/Z 12-bit triplets, reducing host polling frequency and system-level power |
| Digital interfaces | I²C up to 1 MHz; 3-/4-wire SPI up to 4 MHz - supports high-throughput sensor fusion with microcontrollers lacking dedicated motion peripherals |
Pinout & Package
FXLS8971CFR1 is housed in a 3 mm × 3 mm × 1.25 mm 12-pin QFN package with 0.65 mm pitch and wettable flanks, optimized for automated optical inspection and robust solder joint reliability in high-volume manufacturing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Supply voltage input | 1.71–3.6 V DC power for sensor core and digital interface; requires local decoupling per layout guidelines |
| BT_MODE (Pin 2) | Boot mode selector | GND = default operation; VDD = motion-detection boot mode - configures INT1 as MOT_DET with hibernate control |
| SA0/SPI_MISO (Pin 3) | I²C address bit / SPI data output | When INTF_SEL = GND: sets I²C secondary address LSB (18h/19h); when INTF_SEL = VDD: SPI serial data output |
| SDA/SPI_MOSI/SPI_DATA (Pin 4) | I²C data / SPI bidirectional I/O | Configurable as I²C SDA (INTF_SEL = GND) or SPI MOSI (4-wire) / SPI_DATA (3-wire bidirectional) |
| SCL/SCLK (Pin 5) | I²C clock / SPI clock input | Drives timing for I²C (up to 1 MHz) or SPI (up to 4 MHz); requires external pull-up for I²C operation |
| INT2/EXT_TRIG/BOOT_OUT (Pin 6) | Interrupt output / trigger input / boot status | BT_MODE = GND → programmable interrupt or external trigger; BT_MODE = VDD → open-drain boot completion signal |
| SPI_CS_B/WAKE_UP (Pin 7) | SPI chip select / wake-up input | Active-low SPI enable; when BT_MODE = GND, serves as Hibernate wake-up pin with CMOS input threshold |
| INT1/MOT_DET (Pin 8) | Primary interrupt / motion detection I/O | BT_MODE = GND → push-pull interrupt; BT_MODE = VDD → MOT_DET line for motion enable/disable and threshold selection |
| INTF_SEL (Pin 9) | Interface mode selector | GND = I²C mode; VDD = SPI mode - hardwired during PCB design to fix communication protocol |
| GND (Pin 10) | Power ground reference | Common return path for analog and digital domains; must be connected to low-impedance system ground plane |
| NC (Pins 11, 12) | No connection | Unbonded die pads; must remain floating - no routing or soldering permitted |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous orientation detection | Portrait/Landscape/Up/Down classification using on-device logic - eliminates host CPU load and latency in UI rotation or fall detection |
| Programmable Sensor Data Change Detection (SDCD) | Configurable thresholds for motion/no-motion, freefall, and high-g events - enables zero-host-intervention wake-up in battery-constrained systems |
| Flexible performance mode | Custom ODRs with programmable decimation and idle-time settings - balances resolution, bandwidth, and current draw per application need |
| Robust self-test diagnostics | Bidirectional electrostatic actuation with motion/orientation immunity - validates sensor functionality in-system without mechanical stimulus |
| Temperature-compensated offset stability | Post-board-mount zero-g offset ±30 mg (typ) and TCO ±0.15 mg/°C (typ) - ensures consistent calibration across thermal cycling in field-deployed devices |
Applications
| Asset Tracking | Smart Inhaler Monitoring |
|---|---|
Use Scenario: Real-time location and movement history logging for high-value industrial tools or medical equipment during transit and storage. IC Role / Device Role / Timing Role: Motion-triggered wake-up and orientation-aware logging - FXLS8971CFR1 remains in Hibernate (<15 nA) until motion exceeds threshold, then captures timestamped 3-axis data. Use Value: Extends battery life beyond 5 years while enabling tamper alerts, drop detection, and position verification without continuous polling. |
Use Scenario: Detecting and recording inhalation timing, duration, and orientation for adherence tracking in connected respiratory therapy devices. IC Role / Device Role / Timing Role: Low-latency motion onset detection and vector-magnitude-based breath-phase classification - FXLS8971CFR1 triggers on inhalation acceleration profile and logs orientation-corrected Z-axis peak. Use Value: Achieves clinical-grade inhalation event accuracy with <1 µA average current in standby, eliminating need for external wake controllers. |
| Equipment Vibration Monitoring | Point-of-Sale Tilt Security |
Use Scenario: Continuous low-frequency vibration analysis of motors, pumps, or compressors to predict bearing wear or imbalance faults. IC Role / Device Role / Timing Role: High-resolution (12-bit), low-noise (230 µg/√Hz) acceleration capture at 100–800 Hz ODR - FXLS8971CFR1 streams buffered data via SPI to MCU for FFT processing. Use Value: Captures sub-mg vibration signatures at 25 °C to +105 °C without recalibration, supporting predictive maintenance in factory-floor enclosures. |
Use Scenario: Preventing unauthorized relocation or tampering of retail payment terminals by detecting angular displacement or lifting events. IC Role / Device Role / Timing Role: Autonomous portrait/landscape orientation detection and tilt-angle threshold triggering - FXLS8971CFR1 asserts INT1 on >15° deviation from calibrated upright position. Use Value: Delivers immediate tamper alert with <5 ms response time and zero host CPU involvement, meeting PCI PTS v6.0 physical security requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-axis low-g accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMA8452Q | 8-bit output resolution; fixed 1.5–200 Hz ODR range; no FIFO; higher 150 µA HPM current | Lacks autonomous SDCD and orientation detection; limited to basic tilt/motion in cost-sensitive consumer products | Select MMA8452Q only if 8-bit resolution suffices and system-level firmware handles motion logic - not suitable for ultra-low-power industrial wake-up. |
| BMI270 | Integrated gyroscope; 16-bit accel resolution; 200 µg/√Hz noise; 2.5 µA LPM at 25 Hz; supports sensor fusion firmware | Higher integration and precision, but requires more complex driver stack and larger footprint; targets AHRS and wearable navigation | Choose BMI270 when gyro-augmented motion tracking is required - FXLS8971CFR1 remains optimal for pure low-power accelerometer-only deployments with minimal BOM overhead. |
Compared with MMA8452Q and BMI270, FXLS8971CFR1 uniquely combines 12-bit resolution, sub-µA wake-ready current, autonomous orientation detection, and industrial temperature qualification in a 3 mm × 3 mm QFN - making it the most power-efficient and thermally robust choice for battery-operated industrial and medical motion sensors where size and longevity are critical.
Availability
FXLS8971CFR1 is available at Aetrix Electronics and suitable for asset tracking, smart inhaler monitoring, and equipment vibration sensing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for FXLS8971CFR1 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
NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT markets, with deep expertise in MEMS sensor design and embedded signal processing.
The FXLS8971CFR1 belongs to NXP's FXLS family of ultra-low-power accelerometers, designed specifically for motion-triggered wake-up and intelligent inertial sensing in battery-powered industrial and medical edge devices.
FAQ
What is the operating voltage range for FXLS8971CFR1?
The FXLS8971CFR1 operates from 1.71 V to 3.6 V DC on the VDD pin. This wide supply range supports direct integration with common 1.8 V and 3.3 V microcontroller I/O domains and enables flexible power architecture design in energy-harvesting or coin-cell-powered systems. Operation outside this range may damage the device or cause undefined behavior.
Does FXLS8971CFR1 support both I²C and SPI interfaces simultaneously?
No - FXLS8971CFR1 supports either I²C or SPI, selected at power-up via the INTF_SEL pin (GND = I²C, VDD = SPI). The interface mode is latched after power-on reset and cannot be changed dynamically. Both protocols are fully supported with documented timing margins, including I²C Fast-mode Plus up to 1 MHz and SPI up to 4 MHz.
How does the motion-detection mode work on FXLS8971CFR1?
In motion-detection mode (BT_MODE = VDD), FXLS8971CFR1 uses the INT1/MOT_DET pin for host-controlled wake-up: pulling MOT_DET low for ≥1 ms enters Hibernate, and a pulse on MOT_DET selects detection threshold. The device autonomously detects motion using its Sensor Data Change Detection engine and pulses MOT_DET for 5 ms upon event - all without host CPU involvement.
What is the FIFO capacity and how is it used in FXLS8971CFR1?
The FXLS8971CFR1 includes a 144-byte FIFO buffer capable of storing up to 32 complete 12-bit X/Y/Z acceleration data triplets. It operates in FIFO or LIFO mode and reduces host polling frequency - especially valuable in low-power applications where the MCU sleeps between bursts of sensor data retrieval. The FIFO status is monitored via dedicated registers and interrupt flags.
Is FXLS8971CFR1 qualified for medical applications?
Yes - FXLS8971CFR1 is specified over –40 °C to +105 °C and features post-board-mount offset stability (±30 mg) and temperature coefficient (±0.15 mg/°C) validated for reliability in clinical environments. It is explicitly cited in the datasheet for patient activity monitors, drug delivery systems, and smart inhalers - meeting key requirements for Class II medical device sensing subsystems.
FXLS8971CFR1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 12-LQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Analog, Digital
- Axis:
- X, Y, Z
- Acceleration Range:
- ±2g, 4g, 8g, 16g
- Sensitivity (LSB/g):
- 1024 (±2g) ~ 128 (±16g)
- Sensitivity (mV/g):
- -
- Bandwidth:
- 1.6kHz
- Output Type:
- I2C, SPI
- Voltage - Supply:
- 1.71V ~ 3.6V
- Features:
- Adjustable Bandwidth, Selectable Scale
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-DLQFN (3x3)
FXLS8971CFR1 FAQ
1.How can I place an order for FXLS8971CFR1 through Aetrix?
Please submit a Request for Quotation (RFQ) for FXLS8971CFR1 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 FXLS8971CFR1 reliable?
The price and inventory of FXLS8971CFR1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FXLS8971CFR1 is usually 5 days.
3.What payment methods are accepted for FXLS8971CFR1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FXLS8971CFR1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FXLS8971CFR1?
FXLS8971CFR1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FXLS8971CFR1 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 FXLS8971CFR1?
For technical support, including FXLS8971CFR1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FXLS8971CFR1 requirements.
6.How does Aetrix verify that FXLS8971CFR1 is sourced from the original manufacturer or authorized distributors?
All FXLS8971CFR1 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 FXLS8971CFR1 meets industry standards.
7.What is the process for return or replacement of FXLS8971CFR1?
All FXLS8971CFR1 units undergo pre-shipment inspection (PSI). If there is an issue with FXLS8971CFR1, 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 FXLS8971CFR1 part is unused and in its original packaging.
Return procedure for FXLS8971CFR1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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