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STMicroelectronics IIS328DQ
- Part No.:
- IIS328DQ
- Manufacturer:
- STMicroelectronics
- Category:
- Accelerometers
- Package:
- 24-FQFN Exposed Pad
- Datasheet:
-
IIS328DQ.pdf
- Description:
- ACCELEROMETER 2-8G I2C/SPI 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,840
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Product details
Overview
IIS328DQ from STMicroelectronics is a high-performance, ultralow-power 3-axis linear accelerometer with digital SPI/I²C interface, ±2g/±4g/±8g dynamically selectable full scale, 16-bit output resolution, and dual programmable inertial interrupt generators. It operates from 2.16 V to 3.6 V, consumes as low as 10 μA in low-power mode, and is qualified for industrial use across –40°C to +105°C.
For engineers reviewing the IIS328DQ datasheet, IIS328DQ pinout, IIS328DQ application, or IIS328DQ equivalent, key selection considerations include its dual-interrupt architecture, factory-calibrated zero-g offset and sensitivity, self-test capability, sleep-to-wake-up functionality, and QFPN-24L package compatibility with space-constrained industrial sensor nodes.
Technical Context
The IIS328DQ integrates a surface-micromachined capacitive MEMS sensing element with a low-noise charge amplifier and 16-bit ADC, delivering acceleration data via configurable SPI (3- or 4-wire) or I²C (standard/fast mode) interfaces. Its measurement chain includes embedded trimming for sensitivity (So) and zero-g offset (TyOff), stored in nonvolatile memory and auto-loaded at power-on.
Two independent interrupt generators support user-defined wake-up events (e.g., motion threshold, free-fall) and position-based triggers, with fully programmable thresholds, timing, and latching via register access. The device supports dynamic ODR scaling from 0.5 Hz to 1 kHz and system bandwidth up to 500 Hz, enabling adaptive power management in battery-operated systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.16 V to 3.6 V - Enables direct integration with common industrial LDOs and battery-backed systems without level-shifting. |
| Current Consumption | 10 μA in low-power mode (ODR = 1 Hz) - Extends operational lifetime in always-on monitoring applications such as tamper detection. |
| Full-Scale Range | ±2g / ±4g / ±8g - Dynamically selectable via register bits to optimize resolution vs. range trade-off per application requirement. |
| Output Resolution | 16-bit digital output - Provides sub-mg resolution (e.g., 0.98 mg/digit at ±2g), critical for tilt and inclination accuracy. |
| Interface Support | SPI (up to 10 MHz) and I²C (up to 400 kHz) - Dual-protocol flexibility simplifies host MCU selection and legacy system upgrades. |
| Operating Temperature | –40°C to +105°C - Validated for harsh industrial environments including motor control cabinets and outdoor enclosures. |
| Self-Test Function | Electrostatic actuation with axis-specific output change (e.g., ±800 LSB on Y-axis at ±2g) - Enables in-field functional verification without mechanical stimulus. |
Pinout & Package
Package: QFPN-24L, 4 mm × 4 mm × 1.8 mm, no-lead, exposed pad (not electrically connected). RoHS-compliant, ECOPACK® certified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 5, 14 | VDD / VDD_IO | VDD powers internal analog/digital core; VDD_IO supplies I/O buffers - allows independent power domain control and 1.8 V logic compatibility. |
| 6, 8, 9, 10 | GND | Four dedicated ground pins minimize noise coupling and improve ADC reference stability in high-resolution measurements. |
| 3, 7 | INT_2 / INT_1 | Dedicated open-drain interrupt outputs - support simultaneous wake-up and free-fall detection with independent configuration. |
| 11, 12, 15, 16 | SCL/SPC, CS, SDO/SA0, SDA/SDI/SDO | Multiplexed I²C/SPI interface pins - CS selects protocol; SA0 sets LSB of I²C address (0011000b or 0011001b) for dual-device bus sharing. |
| 4, 13 | Reserved | Pin 4 must be tied to GND; Pin 13 must be tied to VDD - ensures proper internal biasing and ESD protection network operation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow-power operation | 10 μA at 1 Hz ODR enables multi-year battery life in wireless vibration sensors and portable diagnostic tools. |
| Dual programmable interrupts | Independent configuration of INT_1 and INT_2 allows concurrent detection of motion onset and orientation change without host polling. |
| Sleep-to-wake-up function | Automatic transition from 1 Hz low-power mode to 1 kHz full-rate mode upon interrupt trigger - reduces average system power by >95%. |
| Factory-trimmed calibration | Sensitivity and zero-g offset trimmed at wafer level and stored in NV memory - eliminates need for end-of-line calibration in production. |
| High shock survivability | Withstands 10,000 g shocks (0.1 ms) - suitable for deployment in impact-prone equipment like construction machinery and rail-mounted sensors. |
Applications
| Antitampering Devices | Platform Stabilization |
|---|---|
|
Use Scenario: Mounted inside utility meters or secure enclosures to detect unauthorized physical access or case opening. IC Role / Device Role / Timing Role: Accelerometer detecting sudden acceleration spikes (>2g threshold) triggering immediate tamper alert via INT_1. Use Value: Confirmed 10000 g shock survivability ensures reliable operation after installation impact; 10 μA sleep current extends battery life beyond 5 years. |
Use Scenario: Integrated into antenna positioning systems to maintain alignment during wind-induced tower sway or vehicle motion. IC Role / Device Role / Timing Role: Tilt/inclination sensor feeding real-time pitch/roll data to servo controller at 100 Hz ODR for closed-loop correction. Use Value: ±2g full-scale with 0.98 mg/digit resolution enables <0.1° tilt accuracy; extended temperature range prevents drift in outdoor deployments. |
| Vibration Monitoring | Robotics Motion Control |
|
Use Scenario: Embedded in predictive maintenance sensors on industrial motors and pumps to log RMS acceleration spectra over time. IC Role / Device Role / Timing Role: Low-noise (218 μg/√Hz) accelerometer capturing broadband vibration signatures at 1 kHz ODR for FFT analysis. Use Value: Factory-calibrated sensitivity ensures consistent amplitude tracking across units; self-test validates sensor health before each measurement cycle. |
Use Scenario: Used in collaborative robot joints to detect unintended contact or sudden deceleration for safety shutdown. IC Role / Device Role / Timing Role: Inertial wake-up detector generating INT_2 signal on >3g transient event, initiating emergency stop within 1 ms latency. Use Value: Dual-interrupt architecture isolates safety-critical motion detection from non-critical telemetry; –40°C to +105°C rating supports operation near motor heat sources. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-axis accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LSM6DSOXTR | Integrated 6-axis IMU (accelerometer + gyroscope); higher current (360 μA typical in low-power mode); supports machine learning core. | Targeted at motion-tracking and gesture recognition where angular rate data is required alongside acceleration. | Select when fused orientation estimation or on-sensor AI inference is needed; not drop-in due to different pinout and feature set. |
| ADXL355BCPZ | Analog output option; lower noise (25 μg/√Hz); wider full-scale (±2g/±4g/±8g/±16g); no integrated self-test; higher supply voltage (2.25–3.6 V). | Preferred for precision seismic or structural health monitoring where ultra-low noise dominates over power or digital interface needs. | Choose for metrology-grade static tilt accuracy; requires external ADC and lacks interrupt-driven wake-up capability. |
Compared with LSM6DSOXTR and ADXL355BCPZ, the IIS328DQ uniquely balances ultralow power (10 μA), dual-interrupt autonomy, factory calibration, and industrial temperature resilience - making it optimal for long-life, self-contained industrial sensing nodes without gyro or analog requirements.
Availability
IIS328DQ is available at Aetrix Electronics and suitable for antitampering devices, platform stabilization systems, and vibration monitoring solutions requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for IIS328DQ 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 semiconductors for industrial, automotive, and consumer markets.
The IIS328DQ belongs to ST's "nano" series of industrial-grade MEMS accelerometers, engineered specifically for robust, low-power, long-lifetime sensing in harsh environments - emphasizing reliability, factory calibration, and ease of integration into resource-constrained edge nodes.
FAQ
What is the maximum SPI clock frequency supported by the IIS328DQ?
The IIS328DQ supports SPI clock frequencies up to 10 MHz, with guaranteed timing parameters (e.g., 100 ns minimum clock cycle) validated at that speed. This allows high-speed register access and burst data reads without compromising timing margins in microcontroller-based systems.
How does the self-test function verify sensor integrity in-field?
The self-test applies an electrostatic force to the MEMS proof mass, inducing a known DC-level shift in output (e.g., +800 LSB on Y-axis at ±2g). By reading the response via SPI/I²C and comparing it against datasheet-specified ranges, users confirm both MEMS functionality and signal chain integrity without mechanical movement.
Can INT_1 and INT_2 operate simultaneously with different trigger conditions?
Yes - INT_1 and INT_2 are independently configurable through separate control registers. One can be set for free-fall detection (e.g., all axes <0.2g for 20 ms), while the other monitors wake-up motion (e.g., X-axis >1.5g for 5 ms), enabling concurrent safety and power-management functions.
Is the QFPN-24L package compatible with standard reflow profiles?
Yes - the IIS328DQ's QFPN-24L package complies with JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) and is qualified for standard lead-free reflow profiles (peak temperature ≤260°C). The exposed pad is non-functional and requires no solder connection.
IIS328DQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 24-FQFN Exposed Pad
- 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:
- 2.16V ~ 3.6V
- Features:
- Selectable Scale
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
IIS328DQ FAQ
1.How can I place an order for IIS328DQ through Aetrix?
Please submit a Request for Quotation (RFQ) for IIS328DQ 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 IIS328DQ reliable?
The price and inventory of IIS328DQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IIS328DQ is usually 5 days.
3.What payment methods are accepted for IIS328DQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IIS328DQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IIS328DQ?
IIS328DQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IIS328DQ 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 IIS328DQ?
For technical support, including IIS328DQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IIS328DQ requirements.
6.How does Aetrix verify that IIS328DQ is sourced from the original manufacturer or authorized distributors?
All IIS328DQ 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 IIS328DQ meets industry standards.
7.What is the process for return or replacement of IIS328DQ?
All IIS328DQ units undergo pre-shipment inspection (PSI). If there is an issue with IIS328DQ, 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 IIS328DQ part is unused and in its original packaging.
Return procedure for IIS328DQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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