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STMicroelectronics AIS2120SXTR
- Part No.:
- AIS2120SXTR
- Manufacturer:
- STMicroelectronics
- Category:
- Accelerometers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AIS2120SXTR.pdf
- Description:
- ACCELEROMETER 120G SPI 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,942
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Product details
Overview
AIS2120SXTR from STMicroelectronics is a dual-axis automotive MEMS acceleration sensor with SPI interface, ±120 g full-scale range, 14-bit digital output, and AEC-Q100 qualification-designed for airbag deployment control in passenger vehicles operating from −40 °C to +105 °C.
For engineers reviewing the AIS2120SXTR datasheet, AIS2120SXTR pinout, AIS2120SXTR application, or AIS2120SXTR equivalent, key selection considerations include dual-axis sensing capability, embedded self-test, selectable low-pass filtering (400/800/1600 Hz), slow/fast offset cancellation, and SOIC8N package compatibility with automotive PCB layouts.
Technical Context
The AIS2120SXTR integrates a surface-micromachined silicon proof mass with differential capacitive transduction, a C/V converter, full-differential charge amplifier, second-order sigma-delta ADC, and digital core featuring decimation, linear interpolation, and on-chip oscillator. Its mechanical element detects acceleration via displacement-induced capacitance unbalance.
Digital signal processing includes configurable FIR-based low-pass filters (400/800/1600 Hz), real-time offset cancellation (slow and fast modes), and register-mapped SPI communication supporting 32-bit read/write commands with CRC protection. The device performs factory calibration for sensitivity and offset across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Axis Configuration | Dual-axis (X and Y) - enables simultaneous lateral and longitudinal acceleration monitoring for crash discrimination. |
| Full-Scale Range | ±120 g - supports high-g impact detection required for front/side airbag triggering algorithms. |
| Output Resolution | 14-bit digital output - provides 16,384 discrete levels for sub-g acceleration resolution at ±120 g range. |
| Interface Protocol | SPI (32-bit frame, CRC-protected) - ensures deterministic timing and noise immunity in electrically noisy automotive environments. |
| Operating Temperature | −40 °C to +105 °C - meets under-hood and cabin mounting requirements per AEC-Q100 Grade 2. |
| Supply Voltage | 3.3 V single supply - simplifies power design by eliminating need for dual-rail or voltage translation. |
| Self-Test Function | Embedded electrostatic self-test - allows functional verification without external stimulus during system startup or diagnostics. |
Pinout & Package
Package: SOIC8N (8-pin small outline integrated circuit, narrow body, 150 mil width). RoHS-compliant, ECOPACK certified, tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | 3.3 V nominal supply; bypass capacitor required for analog/digital noise suppression. |
| GND | Ground reference | Analog and digital common ground; requires low-impedance connection to minimize offset drift. |
| SDO | SPI serial data output | Master-in-slave-out line; outputs 32-bit response frames including acceleration data and status flags. |
| SDI | SPI serial data input | Master-out-slave-in line; accepts 32-bit command frames for configuration, register access, and self-test initiation. |
| SCLK | SPI clock input | Drives synchronous communication; max frequency 10 MHz per datasheet timing specs. |
| CS | Chip select input | Active-low enable; must be asserted before SCLK edge to initiate valid SPI transaction. |
| ST | Self-test activation | Hardware-triggered electrostatic self-test; driven high to initiate internal diagnostic sequence. |
| INT | Interrupt output | Open-drain output signaling data-ready, error, or self-test completion; configurable via registers. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-axis sensing (X/Y) | Enables vector-based crash classification by capturing orthogonal acceleration components simultaneously. |
| AEC-Q100 qualified | Validated for automotive use per stress test conditions including HTOL, TC, HAST, and ESD (HBM ±2 kV). |
| Selectable digital LPF | Configurable 400/800/1600 Hz FIR filters suppress high-frequency noise while preserving crash-signal rise time. |
| Slow & fast offset cancellation | Slow mode corrects long-term drift; fast mode compensates for thermal transients during ignition/startup. |
| Factory-trimmed sensitivity | Calibrated at wafer level to reduce post-assembly compensation effort and improve channel-to-channel matching. |
Applications
| Frontal Collision Detection | Side-Impact Monitoring |
|---|---|
|
Use Scenario: Detect rapid deceleration during head-on vehicle collision to trigger driver/front passenger airbags within ≤30 ms. IC Role / Device Role / Timing Role: Primary acceleration sensing element feeding real-time g-level data to airbag control unit (ACU) for deployment decision. Use Value: ±120 g range and 14-bit resolution ensure accurate discrimination between crash events and road shocks (e.g., potholes). |
Use Scenario: Monitor lateral acceleration during T-bone or side-swipe collisions to activate side-curtain and seat-mounted airbags. IC Role / Device Role / Timing Role: Dual-axis X/Y sensing provides directional impact vector for precise side-impact severity assessment. Use Value: Simultaneous X/Y acquisition eliminates timing skew between axes, critical for angular acceleration reconstruction. |
| Vibration-Based Structural Health Monitoring | Occupant Position Sensing (OPS) Support |
|
Use Scenario: Continuously monitor chassis vibration signatures to detect fatigue cracks or loose mounting in ADAS sensor housings. IC Role / Device Role / Timing Role: High-stability inertial reference enabling FFT-based spectral analysis of low-amplitude (<0.5 g) vibrations. Use Value: Extended temperature range (−40 °C to +105 °C) and embedded self-test support long-term reliability validation. |
Use Scenario: Supplement seatbelt pretensioner logic by detecting occupant slouch or forward lean prior to crash event. IC Role / Device Role / Timing Role: Low-noise static acceleration measurement in Z-axis (via tilt-derived X/Y projection) for posture estimation. Use Value: Slow offset cancellation maintains DC accuracy over temperature cycles, improving lean-angle inference fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-axis automotive acceleration sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADXL312WBRMZ-RL | 3.3 V operation, ±120 g, 13-bit output, I²C/SPI interface; lacks AEC-Q100 qualification and embedded self-test. | Targeted at industrial/portable systems-not validated for automotive safety-critical deployment. | Consider only for non-safety prototypes or cost-sensitive non-automotive designs where AEC-Q100 is not mandated. |
| MPU-6050 | 6-axis (3-axis accel + 3-axis gyro), 16-bit accel resolution, I²C-only, no AEC-Q100 rating, operates up to +85 °C. | Designed for motion tracking in consumer electronics-not suitable for airbag control due to temp and qualification gaps. | Use only in infotainment or HUD motion compensation where functional safety is not required. |
Compared with ADXL312WBRMZ-RL and MPU-6050, the AIS2120SXTR delivers automotive-grade reliability through AEC-Q100 qualification, extended temperature operation, and hardware self-test-making it the sole option qualified for ASIL-B–aligned airbag control loops.
Availability
AIS2120SXTR is available at Aetrix Electronics and suitable for airbag systems, impact monitoring, and automotive structural health diagnostics requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for AIS2120SXTR 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, specializing in automotive, industrial, and power management ICs with strong MEMS manufacturing capability.
The AIS2120SXTR belongs to ST's automotive-grade MEMS sensor portfolio, engineered specifically for safety-critical vehicle dynamics sensing-including crash detection, rollover prevention, and electronic stability control.
FAQ
What is the maximum SPI clock frequency supported by AIS2120SXTR?
The AIS2120SXTR supports SPI clock frequencies up to 10 MHz, as specified in Section 5.3 (Timing Parameters) of the datasheet. This allows sub-10 µs readout latency for acceleration data registers, meeting real-time airbag control timing budgets. Operation above 10 MHz may cause communication errors or data corruption.
Does AIS2120SXTR provide temperature-compensated output?
Yes-the device integrates an on-die temperature sensor and applies factory-calibrated compensation coefficients in its digital core. Section 4.5 (Factory calibration) confirms that sensitivity and offset are trimmed across temperature, and Section 31 (Temperature sensor data example) shows typical compensated output stability over −40 °C to +105 °C.
How is the self-test function triggered and verified?
The self-test is activated by driving the ST pin high, which applies electrostatic force to the proof mass. Verification is performed by reading REG_ACC_CHX_HIGH/LOW and REG_ACC_CHY_HIGH/LOW registers post-test: a valid response shows ≥10% full-scale deflection in both axes with <5% inter-axis crosstalk, per Section 3.4 and Table 39 (Acceleration data example).
Can AIS2120SXTR operate in single-axis mode?
No-it is a fixed dual-axis (X/Y) sensor. Unlike the AIS1120SXTR (single-axis X), the AIS2120SXTR's mechanical structure and register map (e.g., presence of CHY registers) are designed exclusively for two-axis operation. There is no hardware or firmware provision to disable one axis.
AIS2120SXTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Digital
- Axis:
- X, Y
- Acceleration Range:
- ±120g
- Sensitivity (LSB/g):
- 68
- Sensitivity (mV/g):
- -
- Bandwidth:
- 400Hz
- Output Type:
- SPI
- Voltage - Supply:
- 3.13V ~ 3.47V
- Features:
- Adjustable Bandwidth
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AIS2120SXTR FAQ
1.How can I place an order for AIS2120SXTR through Aetrix?
Please submit a Request for Quotation (RFQ) for AIS2120SXTR 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 AIS2120SXTR reliable?
The price and inventory of AIS2120SXTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AIS2120SXTR is usually 5 days.
3.What payment methods are accepted for AIS2120SXTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AIS2120SXTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AIS2120SXTR?
AIS2120SXTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AIS2120SXTR 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 AIS2120SXTR?
For technical support, including AIS2120SXTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AIS2120SXTR requirements.
6.How does Aetrix verify that AIS2120SXTR is sourced from the original manufacturer or authorized distributors?
All AIS2120SXTR 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 AIS2120SXTR meets industry standards.
7.What is the process for return or replacement of AIS2120SXTR?
All AIS2120SXTR units undergo pre-shipment inspection (PSI). If there is an issue with AIS2120SXTR, 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 AIS2120SXTR part is unused and in its original packaging.
Return procedure for AIS2120SXTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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