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STMicroelectronics LIS25BATR
- Part No.:
- LIS25BATR
- Manufacturer:
- STMicroelectronics
- Category:
- Accelerometers
- Package:
- 14-VFLGA
- Datasheet:
-
LIS25BATR.pdf
- Description:
- ACCELEROMETER 3.85G I2C
- Quantity:
- Payment:
- Shipping:
Inventory:11,974
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Product details
Overview
LIS25BATR from STMicroelectronics is a low-noise, high-bandwidth 3-axis MEMS digital accelerometer with TDM slave interface, ±3.85 g full-scale range, 2400 Hz signal bandwidth, and 16-bit output resolution. It operates across –40 °C to +85 °C in an LGA-14 package and is used in audio-accelerometer fusion systems for voice activity detection and acoustic event classification.
For engineers reviewing the LIS25BATR datasheet, LIS25BATR pinout, LIS25BATR application, or LIS25BATR equivalent, key selection criteria include TDM timing compliance (BCLK/WCLK synchronization), RMS noise performance (1.5 mg rms X/Y, 2.4 mg rms Z), shock survivability (20,000 g), and dual-interface support (TDM for streaming, I²C for configuration).
Technical Context
The LIS25BATR implements a dedicated TDM slave interface with configurable slot mapping (e.g., X→SLOT0, Y→SLOT1, Z→SLOT2) and supports three WCLK rates (8/16/24 kHz), each paired with corresponding BCLK frequencies (1.024/2.048/3.072 MHz). MCLK accuracy is ±0.1% at 12.288 MHz, and all TDM timing parameters-including SDOUT setup/hold times (15 ns/15 ns)-are specified for both rising- and falling-edge BCLK polarity modes.
It integrates factory-trimmed sensitivity (0.122 mg/LSB typ.) and zero-g offset calibration, with guaranteed non-linearity (±2%FS) and THD+N ≤1% at 1 kHz. The device supports triaxial, biaxial, and monoaxial operating modes, drawing 3.3 mA (triaxial), 2.75 mA (biaxial), or 2.2 mA (monoaxial) at 1.8 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full Scale Range | ±3.85 g - Enables high-dynamic-range motion capture without clipping in vibration-rich environments like industrial audio sensors. |
| Signal Bandwidth | 2400 Hz - Supports accurate capture of transient mechanical events up to audio sub-band frequencies. |
| Output Resolution | 16-bit - Delivers 0.122 mg/LSB sensitivity resolution for fine-grained acceleration quantization. |
| RMS Noise (X/Y) | 1.5 mg rms - Ensures clean signal acquisition for voice-triggered wake-word detection in low-SNR acoustic contexts. |
| Shock Survivability | 20,000 g - Guarantees operational integrity after mechanical shock events common in portable consumer electronics drop tests. |
| Supply Voltage | 1.71–1.99 V - Matches low-voltage SoC I/O domains and enables direct interfacing with 1.8 V audio DSPs. |
| Operating Temp | –40 °C to +85 °C - Validated for deployment in automotive cabin microphones and outdoor industrial monitoring nodes. |
Pinout & Package
The LIS25BATR is housed in a 2.5 mm × 2.5 mm × 0.86 mm LGA-14 package with exposed pad for thermal and mechanical stability. All 14 terminals are surface-mount land-grid array contacts; no through-hole or leaded variants exist.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (I2C_SCL) | I²C serial clock input | Used only for register configuration; not guaranteed for production timing-reserved for trim/test during manufacturing. |
| 2 (I2C_SDA) | I²C bidirectional data line | Configures TDM_CTRL_REG, AXES_CTRL_REG, and self-test registers; shares bus with other I²C peripherals. |
| 3 (TDM_BCLK) | TDM bit clock input | Synchronizes SDOUT data edges; supports rising/falling edge sampling per configuration register setting. |
| 4 (TDM_WCLK) | TDM word clock input | Defines frame boundary and sample rate (8/16/24 kHz); must be stable and jitter-controlled (<1 ns pk-pk). |
| 5 (TDM_SDOUT) | TDM serial data output | 3×16-bit aligned samples per frame (X/Y/Z), LSB-first, MSB-aligned within each 16-bit word. |
| 6, 10, 12, 13, 14 (RES) | Reserved terminals | Must be connected to GND (pins 6,12,13,14) or VDD (pin 10); floating connections risk ESD susceptibility or noise coupling. |
| 7 (TDM_MCLK) | TDM master clock input | 12.288 MHz reference for internal PLL; ±0.1% accuracy required to maintain TDM slot alignment and jitter specs. |
| 8 (VDD) | Power supply | 1.71–1.99 V analog/digital supply; requires local 1 µF + 100 nF decoupling adjacent to pin 8 and pin 9. |
| 9 (GND) | Ground reference | Primary return path for analog sensing core and digital I/O; must be low-impedance and separated from noisy digital ground planes. |
| 11 (I2C_A0) | I²C slave address select | Sets LSB of 7-bit I²C address (default 0x3A if low, 0x3B if high); enables dual-device addressing on same bus. |
Key Features
| Feature | Design Value |
|---|---|
| TDM slave interface | Dedicated 3-axis streaming path with deterministic latency, eliminating CPU polling overhead in real-time audio pipelines. |
| Factory-calibrated sensitivity | 0.122 mg/LSB typical with ±0.08%/°C TCSo ensures stable scale factor across automotive temperature ranges. |
| Low-noise analog front-end | 1.5 mg rms (X/Y) and 2.4 mg rms (Z) in-band noise enables SNR >60 dB for voice-band acceleration signals. |
| High-shock survivability | 20,000 g rating per MIL-STD-883H Method 2002.5 Condition F allows use in handheld devices subject to drop impact. |
| Multi-mode power optimization | Triaxial (3.3 mA), biaxial (2.75 mA), and monoaxial (2.2 mA) modes let designers trade axis count for battery life in wearables. |
Applications
| Smart Speaker Wake Word Detection | Industrial Vibration Monitoring |
|---|---|
Use Scenario: Detecting mechanical vibrations induced by spoken wake words (e.g., "Alexa") in far-field smart speakers. IC Role / Device Role / Timing Role: Accelerometer provides auxiliary motion trigger to reduce false positives from audio-only ASR; TDM streams synchronized 3-axis data at 16 kHz to DSP. Use Value: 2400 Hz bandwidth captures vocal cord vibration harmonics; 1.5 mg rms noise floor enables reliable discrimination against ambient room noise. |
Use Scenario: Continuous monitoring of bearing vibration signatures in factory-floor motors and pumps. IC Role / Device Role / Timing Role: High-bandwidth sensor feeds time-domain waveform data to FFT-based anomaly detection firmware running on edge MCU. Use Value: 20,000 g shock rating prevents failure during unexpected mechanical transients; ±3.85 g FS covers normal operational envelope without saturation. |
| Automotive Cabin Microphone Array | Wearable Fall Detection |
Use Scenario: Suppressing engine and road noise in in-cabin voice communication systems using accelerometer-audio fusion. IC Role / Device Role / Timing Role: LIS25BATR's TDM output aligns precisely with microphone PDM data clocks, enabling sample-synchronous beamforming. Use Value: Guaranteed PSRIBZ of 6.32 mgrms suppresses power-supply ripple coupling into Z-axis measurement-critical for vertical vibration rejection. |
Use Scenario: Detecting rapid deceleration events (>3 g) followed by prolonged immobility in elderly-worn pendants. IC Role / Device Role / Timing Role: Configured in monoaxial mode for longest battery life; triggers interrupt on threshold-crossing via embedded hardware engine. Use Value: 2.2 mA current draw extends coin-cell battery life beyond 12 months; –40 °C to +85 °C rating ensures operation in cold outdoor environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-axis TDM accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADXL355BRWZ | Analog voltage output, SPI/I²C interface only-no native TDM; 1000 Hz BW, 25 µg/√Hz noise density. | Requires external ADC and FPGA/ASIC for TDM framing; better suited for precision inertial navigation than audio-fusion. | Select when ultra-low noise and DC stability outweigh need for direct DSP interface. |
| ICM-42688-P | Supports I³C and SPI, includes on-chip FIFO and ODR programmability up to 32 kHz; 2000 g shock rating. | Lacks TDM interface-requires software-based time-slicing for multi-sensor streaming; optimized for motion tracking, not audio sync. | Choose for compact IMU designs needing gyro+accel fusion, where TDM is not mandated by host processor. |
Compared with ADXL355BRWZ and ICM-42688-P, the LIS25BATR uniquely delivers deterministic, low-latency 3-axis streaming directly into TDM-capable audio SoCs-eliminating glue logic, reducing BOM count, and simplifying timing-critical firmware integration.
Availability
LIS25BATR is available at Aetrix Electronics and suitable for smart speaker development, industrial predictive maintenance systems, automotive cabin microphone arrays, and wearable health monitors requiring stable component supply across long production lifecycles.
Supply support for LIS25BATR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing MEMS sensors, microcontrollers, power management ICs, and automotive-grade components.
The LIS25BA belongs to ST's high-performance motion sensor product line, engineered specifically for audio-accelerometer co-processing in always-on voice interfaces and industrial condition monitoring systems.
FAQ
What is the primary interface used for real-time acceleration data streaming in the LIS25BATR?
The LIS25BATR uses its dedicated TDM slave interface for continuous, low-latency 3-axis acceleration streaming. This interface outputs time-aligned X/Y/Z samples in fixed slots per frame at 8/16/24 kHz rates, enabling direct connection to audio DSPs without buffering or software intervention. The I²C interface is reserved solely for configuration and control-not data transfer.
Can the LIS25BATR operate without an external MCLK signal?
No. The LIS25BATR requires a stable 12.288 MHz MCLK input on pin 7 for internal PLL operation and TDM timing generation. Without MCLK, the TDM interface cannot lock to WCLK/BCLK, and SDOUT remains inactive. The device does not support internal oscillator or clock multiplication alternatives.
How is shock survivability validated for the LIS25BATR?
Shock survivability is validated per MIL-STD-883H Method 2002.5 Condition F, applying a 20,000 g half-sine pulse (0.1 ms duration) to the package. Post-test functional verification confirms full electrical and metrological performance retention-including full-scale range, noise floor, and TDM output integrity-across all axes.
What is the role of the four reserved pins (6, 12, 13, 14) in the LGA-14 package?
Pins 6, 12, 13, and 14 are reserved and must be connected to GND per datasheet Table 2. Leaving them floating increases susceptibility to ESD damage and may induce coupling of switching noise into the analog sensing element. Pin 10 is also reserved but requires connection to VDD-not GND-to ensure proper internal biasing and thermal stability.
LIS25BATR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- MEMS
- Package/Case:
- 14-VFLGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Digital
- Axis:
- X, Y, Z
- Acceleration Range:
- ±3.85g
- Sensitivity (LSB/g):
- 8196
- Sensitivity (mV/g):
- -
- Bandwidth:
- 2.34kHz
- Output Type:
- I2C
- Voltage - Supply:
- 1.71V ~ 1.99V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- -
LIS25BATR FAQ
1.How can I place an order for LIS25BATR through Aetrix?
Please submit a Request for Quotation (RFQ) for LIS25BATR 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 LIS25BATR reliable?
The price and inventory of LIS25BATR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LIS25BATR is usually 5 days.
3.What payment methods are accepted for LIS25BATR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LIS25BATR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LIS25BATR?
LIS25BATR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LIS25BATR 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 LIS25BATR?
For technical support, including LIS25BATR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LIS25BATR requirements.
6.How does Aetrix verify that LIS25BATR is sourced from the original manufacturer or authorized distributors?
All LIS25BATR 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 LIS25BATR meets industry standards.
7.What is the process for return or replacement of LIS25BATR?
All LIS25BATR units undergo pre-shipment inspection (PSI). If there is an issue with LIS25BATR, 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 LIS25BATR part is unused and in its original packaging.
Return procedure for LIS25BATR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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