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STMicroelectronics AIS25BATR
- Part No.:
- AIS25BATR
- Manufacturer:
- STMicroelectronics
- Category:
- Accelerometers
- Package:
- 14-VFLGA
- Datasheet:
-
AIS25BATR.pdf
- Description:
- MEMS DIGITAL OUTPUT MOTION SENSO
- Quantity:
- Payment:
- Shipping:
Inventory:4,935
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Product details
Overview
AIS25BATR from STMicroelectronics is an AEC-Q100 qualified 3-axis digital accelerometer with user-selectable ±3.85 g / ±7.7 g full-scale range, 2.4 kHz bandwidth, 266 µs latency at 2 kHz, and ultralow noise density (30 µg/√Hz X/Y, 50 µg/√Hz Z). It integrates a dedicated TDM slave interface for real-time sensor data streaming and I²C for configuration, targeting automotive wideband active noise control (ANC) systems.
For engineers reviewing the AIS25BATR datasheet, AIS25BATR pinout, AIS25BATR application, or AIS25BATR equivalent, this device delivers deterministic low-latency acceleration data with synchronized TDM timing, high shock survivability (10,000 g), extended temperature operation (−40 °C to +125 °C), and compact LGA-14 packaging for space-constrained automotive modules.
Technical Context
The AIS25BATR implements a MEMS sensing element with factory-calibrated sensitivity (0.122 mg/LSB at ±3.85 g) and integrated signal chain including ADC, decimation filter, and TDM serializer. Its TDM interface supports three fixed output data rates-8 kHz, 16 kHz, and 24 kHz-synchronized to WCLK, with BCLK derived from MCLK via integer division to ensure phase coherence with internal sampling.
It features dual digital interfaces: I²C (up to 400 kHz) exclusively for register configuration (not data readout), and TDM (3-wire: BCLK, WCLK, SDOUT) for continuous high-throughput acceleration data delivery. Reserved pins are hard-biased (GND or VDD) per layout guidance, and self-test functionality enables in-system verification of mechanical response across all axes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-scale range | ±3.85 g or ±7.7 g - selectable via register; determines dynamic range and resolution trade-off in ANC feedback loops |
| Bandwidth | DC to 2.4 kHz (typ) - enables capture of high-frequency vibration modes critical for wideband ANC error signal generation |
| Latency | 266 µs (typ @ 2 kHz) - end-to-end delay from physical acceleration to TDM data valid; essential for real-time closed-loop control stability |
| Noise density | 30 µg/√Hz (X/Y), 50 µg/√Hz (Z) - defines minimum detectable acceleration change; directly impacts ANC residual noise floor |
| Supply voltage | 1.71 V to 2.1 V - narrow rail optimized for automotive domain controllers; requires tight regulation and local 10 µF decoupling |
| Operating temp | −40 °C to +125 °C - qualified for under-hood and cabin-mounted automotive locations without derating |
| Shock survivability | 10,000 g (0.2 ms) - ensures robustness against mechanical transients during vehicle assembly and service |
Pinout & Package
Package: LGA-14L, 2.5 mm × 2.5 mm × 0.86 mm, lead-free, RoHS-compliant. Requires 10 µF ceramic decoupling capacitor between VDD and GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: I2C_SCL | I²C serial clock input | Controls timing for configuration register access only; not used for sensor data transfer |
| 2: I2C_SDA | I²C bidirectional data line | Carries register writes/reads; must be pulled up externally; shares bus with other I²C peripherals |
| 3: TDM_BCLK | TDM bit clock input | Synchronizes bit-level shifting of SDOUT; frequency derived from MCLK and WCLK ratio |
| 4: TDM_WCLK | TDM word clock input | Defines frame boundary and ODR (8/16/24 kHz); rising edge triggers new sample frame |
| 5: TDM_SDOUT | TDM serial data output | 3-axis acceleration data streamed left-justified in configurable slots (0–2 or 4–6); no pull-up required |
| 6, 12, 13, 14: RES (GND) | Reserved, hard-connected to ground | Must be soldered to GND plane; improves thermal dissipation and EMI immunity |
| 7: TDM_MCLK | TDM master clock input | 12.288 MHz nominal reference; drives internal ADC and TDM timing; jitter ≤1 ns (p-p) |
| 8: VDD | Power supply | 1.71–2.1 V analog/digital rail; sensitive to noise; requires local 10 µF decoupling |
| 9: GND | Ground reference | Common return for analog and digital sections; must be low-impedance connection to PCB ground plane |
| 10: RES (VDD) | Reserved, hard-connected to VDD | Must be tied to same VDD net; stabilizes internal bias networks |
| 11: I2C_A0 | I²C slave address select | Configures LSB of 7-bit I²C address (0x30 or 0x31); enables dual-device addressing on same bus |
Key Features
| Feature | Design Value |
|---|---|
| Dual-interface architecture | TDM for deterministic real-time data streaming + I²C for non-intrusive configuration; eliminates polling overhead in ANC host processors |
| Configurable TDM slot mapping | X/Y/Z axes assignable to slots 0–2 or 4–6 via register; enables time-aligned multiplexing with other TDM sensors in audio subsystems |
| Factory-calibrated sensitivity & offset | ±9% sensitivity tolerance and ±180 mg zero-g offset at 25 °C; reduces need for system-level calibration in production |
| Embedded self-test | Electrostatic actuation verifies MEMS element response per axis (300–2700 mg deviation); supports ASIL-B diagnostic coverage |
| High shock survivability | 10,000 g mechanical rating; maintains functionality after crash simulation or drop testing in module integration |
Applications
| Wideband Active Noise Control (ANC) | Vibration Monitoring |
|---|---|
|
Use Scenario: Real-time cabin noise cancellation in electric vehicles using feedforward + feedback algorithms. IC Role / Device Role / Timing Role: Primary acceleration reference for error microphone path compensation; provides synchronized 24 kHz TDM data to DSP. Use Value: 266 µs latency and 2.4 kHz bandwidth enable suppression of high-frequency combustion harmonics and road noise up to 1.2 kHz. |
Use Scenario: Continuous chassis and powertrain vibration analysis for predictive maintenance in commercial fleets. IC Role / Device Role / Timing Role: High-fidelity triaxial vibration sensor mounted on gearbox housing; streams raw acceleration via TDM to edge analytics MCU. Use Value: 30 µg/√Hz noise density captures subtle bearing defects; −40 °C to +125 °C rating supports under-hood deployment without thermal drift compensation. |
| Engine Mount Monitoring | Electric Power Steering (EPS) Feedback |
|
Use Scenario: Detection of engine mount degradation via abnormal low-frequency resonance shifts during idle and acceleration. IC Role / Device Role / Timing Role: Low-latency accelerometer embedded in mount bracket; feeds 16 kHz TDM stream to body control module. Use Value: ±7.7 g full-scale captures transient torque-induced mount deflection; 10,000 g shock rating prevents false failure during rough-road events. |
Use Scenario: Supplemental torque ripple detection in EPS systems to improve steering smoothness and reduce motor whine. IC Role / Device Role / Timing Role: Z-axis dominant vibration sensor on steering column; outputs synchronized TDM data aligned with motor PWM cycles. Use Value: 50 µg/√Hz Z-axis noise density resolves micro-vibrations below 100 Hz; I²C-configurable ODR avoids aliasing with 1–5 kHz EPS switching frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-axis automotive accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDK IAM-20380 | Wider supply range (1.71–3.6 V); no dedicated TDM interface; uses SPI/I²C for both config and data; higher noise density (80 µg/√Hz) | Lacks deterministic TDM timing; requires host CPU intervention for data reads; less suitable for real-time ANC loop closure | Prefer when multi-sensor SPI daisy-chaining is needed and latency <500 µs is acceptable |
| Analog Devices ADXL372 | Higher full-scale (±200 g); event-triggered wake-up mode; no TDM; I²C/SPI only; lower bandwidth (2.9 kHz but no flat response guarantee) | Optimized for impact detection, not continuous wideband streaming; lacks automotive temp range certification | Prefer for crash-event logging or condition monitoring where burst-mode operation suffices |
Compared with IAM-20380 and ADXL372, the AIS25BATR uniquely combines AEC-Q100 qualification, guaranteed flat 2.4 kHz bandwidth, sub-300 µs latency, and hardware-synchronized TDM output-making it the only choice for production automotive ANC systems requiring deterministic real-time acceleration data.
Availability
AIS25BATR is available at Aetrix Electronics and suitable for wideband active noise control (ANC), engine mount monitoring, vibration-based predictive maintenance, and electric power steering (EPS) feedback applications requiring stable component supply across automotive production lifecycles.
Supply support for AIS25BATR 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, specializing in automotive, industrial, and power management ICs with vertical manufacturing capability and AEC-Q100 design expertise.
The AIS25BA product line targets high-fidelity automotive sensing applications demanding ultra-low noise, wide bandwidth, and deterministic digital interfaces-specifically engineered for next-generation active noise cancellation and structural health monitoring systems.
FAQ
Can AIS25BATR output acceleration data over I²C?
No. The I²C interface is strictly for configuration register access (e.g., full-scale selection, TDM mapping, self-test activation). Accelerometer data is output exclusively via the TDM interface (pins TDM_BCLK, TDM_WCLK, TDM_SDOUT) in synchronous frames at 8/16/24 kHz. Attempting to read sensor data over I²C will return undefined values.
What is the purpose of the four RES (GND) pins?
Pins 6, 12, 13, and 14 are reserved and internally connected to ground. They must be externally soldered to the PCB ground plane to enhance thermal conduction, reduce package inductance, and improve electromagnetic immunity-especially critical for low-noise analog performance in automotive environments.
How is the 266 µs latency measured and what does it include?
The 266 µs latency is the total end-to-end delay from mechanical acceleration input to valid data on TDM_SDOUT at 2 kHz ODR. It includes MEMS element response, analog signal conditioning, ADC conversion, digital filtering, and TDM serialization-verified by design and characterized across temperature at 25 °C per DS14019 Rev 1, page 3.
Is external clock required for TDM operation?
Yes. TDM operation requires three external clocks: TDM_MCLK (12.288 MHz nominal), TDM_WCLK (8/16/24 kHz), and TDM_BCLK (derived from MCLK/WCLK ratio). All must be provided synchronously; the device does not generate or multiply clocks internally. MCLK jitter must remain ≤1 ns (peak-to-peak) to maintain ADC accuracy.
AIS25BATR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 14-VFLGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Digital
- Axis:
- X, Y, Z
- Acceleration Range:
- ±3.85g, 7.7g
- Sensitivity (LSB/g):
- -
- Sensitivity (mV/g):
- -
- Bandwidth:
- 2.4kHz
- Output Type:
- I2C, TDM
- Voltage - Supply:
- 1.71V ~ 2.1V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-LGA (2.5x2.5)
AIS25BATR FAQ
1.How can I place an order for AIS25BATR through Aetrix?
Please submit a Request for Quotation (RFQ) for AIS25BATR 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 AIS25BATR reliable?
The price and inventory of AIS25BATR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AIS25BATR is usually 5 days.
3.What payment methods are accepted for AIS25BATR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AIS25BATR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AIS25BATR?
AIS25BATR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AIS25BATR 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 AIS25BATR?
For technical support, including AIS25BATR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AIS25BATR requirements.
6.How does Aetrix verify that AIS25BATR is sourced from the original manufacturer or authorized distributors?
All AIS25BATR 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 AIS25BATR meets industry standards.
7.What is the process for return or replacement of AIS25BATR?
All AIS25BATR units undergo pre-shipment inspection (PSI). If there is an issue with AIS25BATR, 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 AIS25BATR part is unused and in its original packaging.
Return procedure for AIS25BATR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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