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STMicroelectronics AIS328DQTR
- Part No.:
- AIS328DQTR
- Manufacturer:
- STMicroelectronics
- Category:
- Accelerometers
- Package:
- 24-QFN
- Datasheet:
-
AIS328DQTR.pdf
- Description:
- ACCELEROMETER 2-8G I2C/SPI 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:10,077
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Product details
Overview
AIS328DQTR from STMicroelectronics is a high-performance, ultra-low-power 3-axis digital accelerometer qualified for automotive applications (AEC-Q100), operating across -40 °C to +105 °C, with dynamically selectable ±2g/±4g/±8g full-scale ranges, 16-bit SPI/I²C output, and 10 μA low-power mode consumption - used in telematics, black boxes, and motion-activated vehicle safety systems.
For engineers reviewing the AIS328DQTR datasheet, AIS328DQTR pinout, AIS328DQTR application, or AIS328DQTR equivalent, key selection criteria include AEC-Q100 qualification, dual SPI/I²C interface support, programmable inertial interrupts, embedded self-test, and QFPN-24 package compatibility with automotive-grade thermal and shock survivability (10,000 g).
Technical Context
The AIS328DQTR integrates a MEMS sensing element with a low-noise analog front-end, 12-bit ADC (with 16-bit data output via left-aligned format), and configurable digital signal path including high-pass filtering and sleep-to-wakeup logic. Its dual-mode serial interface supports SPI (4-wire or 3-wire) and I²C (standard/fast-mode), with CS pin selecting protocol and internal pull-ups on SCL/SDA/SDO/SDI/SPC.
Two independent interrupt generators (INT1, INT2) provide user-programmable thresholds, duration, and event sources (motion detection, wake-up, data-ready, FIFO status), enabling autonomous operation without host processor intervention. Factory calibration ensures offset and sensitivity accuracy across temperature, with zero-g offset drift ≤ ±2 mg/°C (X/Y) and ≤ ±3 mg/°C (Z).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.4 V to 3.6 V - supports wide automotive battery range; VDD_IO tolerant to 1.8 V for mixed-voltage system interfacing. |
| Full-Scale Range | ±2g / ±4g / ±8g - software-selectable per application; enables optimal resolution trade-off (e.g., 0.98 mg/digit at ±2g). |
| Output Resolution | 16-bit digital output - provides extended dynamic range beyond native 12-bit ADC via left-aligned format. |
| Low-Power Mode Current | 10 μA - enables always-on monitoring in battery-constrained automotive modules (e.g., parking sensors, impact loggers). |
| Operating Temperature | -40 °C to +105 °C - meets under-hood and cabin deployment requirements per AEC-Q100 Grade 2. |
| Shock Survivability | 10,000 g - ensures functional integrity during crash events or mechanical stress in safety-critical systems. |
| Interface Support | SPI (4-/3-wire) and I²C - dual-protocol flexibility simplifies integration into legacy and new automotive ECUs. |
Pinout & Package
Package: QFPN-24 (4 × 4 × 1.8 mm³), wettable flank, RoHS-compliant, ECOPACK® green packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 5, 6, 8, 9, 10 | VDD / GND | Dedicated power and ground pins minimize noise coupling; multiple GND pins improve return path integrity for analog and digital domains. |
| 11 | SPC / SCL | Shared clock input: SPI serial port clock or I²C serial clock; internal active pull-up eliminates external resistor. |
| 12 | CS | Mode select: low = SPI enabled, high = I²C mode; also serves as chip select in SPI configuration. |
| 14 | VDD_IO | Independent I/O supply rail - allows 1.8 V logic interfacing while core runs at 3.3 V, reducing EMI and power loss. |
| 15 | SDO / SA0 | Serial data output (SPI) or I²C address LSB; internal pull-up enables open-drain I²C operation without external component. |
| 16 | SDI / SDA | Serial data input (SPI) or bidirectional I²C data line; internal pull-up supports standard I²C bus topology. |
| 3, 7 | INT_2 / INT_1 | Dedicated open-drain interrupt outputs - drive external MCU GPIOs directly; support configurable wakeup and event signaling. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Grade 2 reliability certified for automotive use - includes HTOL, TC, ESD, and mechanical shock testing per JEDEC standards. |
| Programmable Interrupt Generators | Two independent engines with configurable threshold, duration, latch behavior, and source (6-axis motion, direction, free-fall, data-ready). |
| Embedded Self-Test | Electrostatic actuation verifies sensor functionality in-system without external stimulus - critical for ASIL-B/C diagnostic coverage. |
| Sleep-to-Wakeup Function | Automatic transition from <10 μA standby to full operation upon inertial event - reduces host MCU polling overhead and system power budget. |
| Factory-Calibrated Offset & Sensitivity | Initial zero-g offset ≤ ±200 mg (X/Y), ≤ ±300 mg (Z); sensitivity tolerance ≤ ±6% - minimizes post-production calibration effort. |
Applications
| Telematics & Black Boxes | In-Dash Navigation |
|---|---|
Use Scenario: Real-time acceleration logging during vehicle operation for insurance scoring, fleet analytics, or crash reconstruction. IC Role / Device Role / Timing Role: Primary inertial measurement unit capturing 3-axis motion at up to 1 kHz ODR with timestamp-aligned data packets. Use Value: 10,000 g shock survivability ensures data integrity during collision events; AEC-Q100 qualification guarantees long-term reliability in harsh ECU environments. | Use Scenario: Tilt compensation and orientation tracking for GPS-denied navigation in tunnels or urban canyons. IC Role / Device Role / Timing Role: Low-latency tilt sensor feeding pitch/roll data to sensor fusion algorithms alongside gyroscope and magnetometer inputs. Use Value: ±2g/±4g full-scale selection optimizes resolution for subtle inclination changes; 10 μA low-power mode extends battery life in portable dash units. |
| Anti-Theft Devices | Vibration Monitoring |
Use Scenario: Detecting unauthorized vehicle movement or tampering during parked state. IC Role / Device Role / Timing Role: Always-on inertial watchdog triggering wake-up interrupt (INT1) when acceleration exceeds programmable threshold for defined duration. Use Value: Sleep-to-wakeup capability enables sub-10 μA system standby; dual interrupt outputs allow separate alarm and diagnostic signaling paths. | Use Scenario: Continuous chassis or engine-mount vibration analysis for predictive maintenance alerts. IC Role / Device Role / Timing Role: High-bandwidth (up to 1 kHz) acceleration sampling feeding FFT-based spectral analysis firmware. Use Value: 16-bit output and low noise density (100–600 μg/√Hz) preserve signal fidelity for detecting early-stage bearing wear or imbalance. |
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 |
|---|---|---|---|
| ADXL313WBRMZ-RL | Lower max ODR (400 Hz), no AEC-Q100 qualification, single SPI-only interface, 3.3 V only supply. | Targeted at industrial or consumer-grade motion sensing; lacks automotive temperature range and qualification. | Select if cost-sensitive non-automotive designs require lower power (350 nA standby) but accept reduced robustness. |
| KX132-1211 | Wider voltage range (1.71–3.6 V), integrated FIFO (32×16-bit), higher shock rating (50,000 g), but no I²C interface. | Optimized for high-reliability industrial IoT and wearable impact detection; lacks dual-interface flexibility. | Select when deep FIFO buffering and extreme shock tolerance outweigh need for I²C compatibility in automotive gateway modules. |
Compared with ADXL313WBRMZ-RL and KX132-1211, the AIS328DQTR uniquely balances AEC-Q100 compliance, dual SPI/I²C support, and programmable interrupts - making it the preferred choice for automotive ECUs requiring field-proven qualification, interface flexibility, and deterministic wakeup latency.
Availability
AIS328DQTR is available at Aetrix Electronics and suitable for telematics systems, black box recorders, and in-dash navigation units requiring stable component supply across automotive production lifecycles.
Supply support for AIS328DQTR 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, designing and manufacturing microcontrollers, sensors, power ICs, and automotive-grade components.
The AIS328DQTR belongs to ST's automotive-qualified MEMS accelerometer product line, engineered specifically for safety-critical vehicle subsystems requiring high reliability, low power, and seamless integration with CAN/LIN gateways and domain controllers.
FAQ
What is the maximum output data rate (ODR) supported by the AIS328DQTR?
The AIS328DQTR supports an output data rate up to 1 kHz in normal mode, configurable via CTRL_REG1 register. This enables high-fidelity capture of transient events such as impacts or rapid vehicle maneuvers, while lower ODR settings (down to 0.5 Hz) optimize power in always-on monitoring applications.
Does the AIS328DQTR require external pull-up resistors for I²C communication?
No. The AIS328DQTR features internal active pull-ups on SCL (Pin 11), SDA (Pin 16), SDO (Pin 15), and SDI (Pin 16) pins, eliminating the need for external pull-up resistors in standard I²C configurations. External resistors may be added only for specific bus loading or noise immunity requirements.
How is the self-test function implemented, and what does it verify?
The self-test applies electrostatic force to the MEMS proof mass, generating a known acceleration response (e.g., −800 LSb on X-axis at ±2g range). It verifies mechanical integrity, signal chain gain/offset, and register read/write functionality - confirming end-of-line functionality without external equipment, supporting ISO 26262 diagnostic coverage.
Can the AIS328DQTR operate with different supply voltages for core and I/O rails?
Yes. The device separates VDD (2.4–3.6 V for core logic and MEMS) from VDD_IO (1.8 V nominal, up to VDD+0.1 V), enabling direct interfacing with 1.8 V microcontrollers while maintaining full analog performance - critical for mixed-voltage automotive architectures with low-power domain controllers.
AIS328DQTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 24-QFN
- Packaging:
- Tape & Reel (TR)
- 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)
AIS328DQTR FAQ
1.How can I place an order for AIS328DQTR through Aetrix?
Please submit a Request for Quotation (RFQ) for AIS328DQTR 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 AIS328DQTR reliable?
The price and inventory of AIS328DQTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AIS328DQTR is usually 5 days.
3.What payment methods are accepted for AIS328DQTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AIS328DQTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AIS328DQTR?
AIS328DQTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AIS328DQTR 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 AIS328DQTR?
For technical support, including AIS328DQTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AIS328DQTR requirements.
6.How does Aetrix verify that AIS328DQTR is sourced from the original manufacturer or authorized distributors?
All AIS328DQTR 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 AIS328DQTR meets industry standards.
7.What is the process for return or replacement of AIS328DQTR?
All AIS328DQTR units undergo pre-shipment inspection (PSI). If there is an issue with AIS328DQTR, 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 AIS328DQTR part is unused and in its original packaging.
Return procedure for AIS328DQTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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