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STMicroelectronics AIS328DQ
- Part No.:
- AIS328DQ
- Manufacturer:
- STMicroelectronics
- Category:
- Accelerometers
- Package:
- 24-QFN
- Datasheet:
-
AIS328DQ.pdf
- Description:
- ACCELEROMETER 2-8G I2C/SPI 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,322
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Product details
Overview
AIS328DQ from STMicroelectronics is a high-performance, ultra-low-power 3-axis digital accelerometer qualified to AEC-Q100 for automotive use, featuring ±2g/±4g/±8g dynamically selectable full scale, 16-bit SPI/I²C output, and 10 μA ultra-low-power mode consumption. It operates across -40 °C to +105 °C and supports inertial wakeup, self-test, and dual programmable interrupts - deployed in telematics black boxes and in-dash navigation systems.
For engineers reviewing the AIS328DQ datasheet, AIS328DQ pinout, AIS328DQ application, or AIS328DQ equivalent, key selection criteria include automotive-grade temperature range (-40 °C to +105 °C), dual interrupt generation capability, low-voltage I/O compatibility (1.8 V), embedded self-test functionality, and QFPN-24 package mechanical constraints.
Technical Context
The AIS328DQ integrates a MEMS sensing element with a signal-conditioning analog front-end, 16-bit ADC, and configurable digital logic for motion detection and event triggering. Its dual interrupt generators support independent threshold, duration, and configuration registers (INT1_CFG/INT2_CFG), enabling wake-on-motion and position-based alerts without host processor intervention.
It implements both SPI (4-wire and 3-wire modes) and I²C interfaces with internal pull-ups on SPC/SCL, CS, SDO/SA0, and SDI/SDA pins. The device supports programmable high-pass filtering, sleep-to-wakeup timing control, and factory-calibrated offset/sensitivity across temperature - all accessible via 26+ mapped registers including WHO_AM_I (0Fh) for identity verification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 2.4 V to 3.6 V - enables direct integration into 3.3 V automotive power domains with margin for transients |
| I/O voltage compatibility | 1.8 V - allows seamless interfacing with low-voltage microcontrollers without level-shifting |
| Ultra-low-power mode current | 10 μA - extends battery life in always-on telematics or anti-theft monitoring applications |
| Full-scale ranges | ±2g / ±4g / ±8g - user-selectable via CTRL_REG4, supporting both fine-tilt and high-shock detection |
| Output resolution | 16-bit digital - provides sub-mg sensitivity (e.g., 0.98 mg/digit at ±2g) for precision inclination measurement |
| Operating temperature | -40 °C to +105 °C - meets under-hood and dashboard environmental requirements per AEC-Q100 Grade 2 |
| Shock survivability | 10,000 g - ensures robustness during crash events or manufacturing handling |
Pinout & Package
Package: QFPN-24 (4 × 4 × 1.8 mm³), wettable flank, RoHS-compliant, ECOPACK® green packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 5, 14 | VDD / VDD_IO | Separate analog (VDD) and I/O (VDD_IO) supplies - decoupling required per datasheet layout guidelines |
| 6, 8, 9, 10 | GND | Four dedicated ground pins - minimize noise coupling and improve ADC accuracy in noisy automotive environments |
| 11 | SPC / SCL | Shared SPI clock / I²C clock input - internal active pull-up eliminates external resistor need |
| 12 | CS / Mode select | Active-low SPI enable; logic high selects I²C mode - enables single-BOM dual-interface flexibility |
| 15 | SDO / SA0 | SPI data out / I²C address LSB - allows two devices on same I²C bus via SA0 pin strapping |
| 16 | SDI / SDA | Shared SPI input / I²C bidirectional data - supports 3-wire SPI when SDI used as SDO |
| 3, 7 | INT_2 / INT_1 | Dedicated open-drain interrupt outputs - drive external MCU wake lines independently with configurable latching |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualification | Qualified to Grade 2 (-40 °C to +105 °C), including HTOL, TC, ESD, and mechanical shock testing - mandatory for automotive safety-critical subsystems |
| Embedded self-test | Electrostatic actuation verifies sensor integrity in-system without external stimulus - reduces field failure root-cause analysis time |
| Dual programmable interrupts | Independent INT1/INT2 with configurable thresholds, duration, and latch behavior - enables simultaneous impact logging and tilt-triggered wake |
| Sleep-to-wakeup function | Configurable ODR down to 0.5 Hz and wake latency < 10 ms - balances responsiveness and power in battery-powered black boxes |
| High shock survivability | 10,000 g rating - survives solder reflow, drop testing, and crash-induced mechanical stress without calibration shift |
Applications
| Telematics Black Boxes | In-Dash Car Navigation |
|---|---|
Use Scenario: Continuous motion logging during vehicle operation, crash detection, and trip analytics. IC Role / Device Role / Timing Role: Primary inertial sensor providing real-time 3-axis acceleration data at up to 1 kHz ODR for event reconstruction. Use Value: 16-bit resolution and ±8g range capture both gentle braking and severe collision events with minimal quantization error. | Use Scenario: Real-time tilt compensation for GPS dead-reckoning and map orientation in moving vehicles. IC Role / Device Role / Timing Role: Low-latency orientation reference feeding IMU fusion algorithms in navigation SoCs. Use Value: Ultra-low-power mode (10 μA) enables continuous background sensing without draining infotainment system batteries. |
| Tilt / Inclination Measurement | Impact Recognition and Logging |
Use Scenario: Static and quasi-static angle estimation for chassis leveling, cargo monitoring, or ADAS camera alignment. IC Role / Device Role / Timing Role: High-accuracy DC-coupled accelerometer measuring gravity vector with factory-trimmed offset and sensitivity. Use Value: ±2g full-scale with 0.98 mg/digit sensitivity delivers < 0.1° tilt resolution over ±30° range. | Use Scenario: Detecting and timestamping door slams, cargo impacts, or unauthorized vehicle movement. IC Role / Device Role / Timing Role: Autonomous interrupt generator triggering MCU wake and data capture without polling. Use Value: Dual independent interrupt channels allow one to detect high-g shocks while the other monitors low-g vibration patterns. |
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 |
|---|---|---|---|
| ADXL313 | 3.3 V only supply; no AEC-Q100 qualification; 13-bit output; max ODR 400 Hz | Targeted at industrial/commercial portable devices, not automotive safety systems | Select when AEC-Q100 is not required and cost optimization outweighs extended temperature and qualification needs |
| BMA255 | 12-bit output; 2.0–3.6 V supply; AEC-Q100 Grade 2; 10-bit FIFO; no embedded self-test | Optimized for space-constrained consumer wearables and entry-level ADAS modules | Choose for footprint-sensitive designs where 16-bit resolution and self-test are secondary to package size (LGA-12) |
Compared with ADXL313 and BMA255, the AIS328DQ uniquely combines AEC-Q100 Grade 2 qualification, 16-bit resolution, dual interrupt engines, and embedded self-test - making it the only option among the three validated for mission-critical automotive black box and navigation functions requiring long-term reliability across extreme temperatures.
Availability
AIS328DQ is available at Aetrix Electronics and suitable for telematics black boxes, in-dash car navigation systems, tilt/inclination measurement modules, and impact recognition loggers requiring stable component supply across automotive production lifecycles.
Supply support for AIS328DQ 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 microcontrollers, sensors, power ICs, and automotive-grade components for industrial, automotive, and consumer markets.
The AIS328DQ belongs to ST's automotive-qualified MEMS accelerometer product line, engineered specifically for high-reliability motion sensing in harsh vehicular environments - emphasizing AEC-Q100 compliance, extended temperature operation, and functional safety readiness.
FAQ
What is the purpose of the separate VDD and VDD_IO supply pins?
The AIS328DQ uses independent VDD (analog core) and VDD_IO (digital interface) supplies to isolate noise-sensitive analog circuitry from digital switching transients. This separation improves ADC accuracy and reduces cross-talk in electrically noisy automotive environments, especially when interfacing with high-speed MCUs. Decoupling capacitors must be placed close to each supply pin per Section 9.2 of the datasheet.
How does the self-test function verify sensor integrity in-field?
The AIS328DQ's embedded self-test applies electrostatic force to the MEMS proof mass, generating a known acceleration output measurable at OUT_X/Y/Z registers. By comparing the measured LSb change (e.g., −800 LSb for X-axis at ±2g) against datasheet-specified ranges, users confirm mechanical integrity and signal chain functionality without external equipment - critical for post-deployment validation in inaccessible telematics units.
Can INT1 and INT2 be configured for different trigger conditions simultaneously?
Yes - INT1 and INT2 are fully independent. Each has its own configuration register (INT1_CFG/INT2_CFG), threshold (INT1_THS/INT2_THS), source status (INT1_SRC/INT2_SRC), and duration (INT1_DURATION/INT2_DURATION). For example, INT1 can be set to trigger on free-fall detection while INT2 responds to 6g+ impact - both active concurrently without interference.
What is the significance of the QFPN-24 wettable flank package in automotive assembly?
The QFPN-24 wettable flank package features exposed vertical sidewalls on all four edges, enabling automated optical inspection (AOI) of solder joint quality after reflow - a critical requirement for automotive PCB assembly process control. Its 4×4 mm footprint and 1.8 mm height support miniaturized modules while maintaining thermal and mechanical robustness under thermal cycling and vibration stress.
AIS328DQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 24-QFN
- Packaging:
- Tray
- Product Status:
- Active
- Type:
- Digital
- Axis:
- X, Y, Z
- Acceleration Range:
- ±2g, 4g, 8g
- Sensitivity (LSB/g):
- 1020 (±2g) ~ 255 (±8g)
- Sensitivity (mV/g):
- -
- Bandwidth:
- 25Hz ~ 500Hz
- Output Type:
- I2C, SPI
- Voltage - Supply:
- 2.4V ~ 3.6V
- Features:
- Adjustable Bandwidth, Selectable Scale
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
AIS328DQ FAQ
1.How can I place an order for AIS328DQ through Aetrix?
Please submit a Request for Quotation (RFQ) for AIS328DQ 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 AIS328DQ reliable?
The price and inventory of AIS328DQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AIS328DQ is usually 5 days.
3.What payment methods are accepted for AIS328DQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AIS328DQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AIS328DQ?
AIS328DQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AIS328DQ 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 AIS328DQ?
For technical support, including AIS328DQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AIS328DQ requirements.
6.How does Aetrix verify that AIS328DQ is sourced from the original manufacturer or authorized distributors?
All AIS328DQ 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 AIS328DQ meets industry standards.
7.What is the process for return or replacement of AIS328DQ?
All AIS328DQ units undergo pre-shipment inspection (PSI). If there is an issue with AIS328DQ, 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 AIS328DQ part is unused and in its original packaging.
Return procedure for AIS328DQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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