My Inquiry
My Account
STMicroelectronics IIS328DQTR
- Part No.:
- IIS328DQTR
- Manufacturer:
- STMicroelectronics
- Category:
- Accelerometers
- Package:
- 24-QFN
- Datasheet:
-
IIS328DQTR.pdf
- Description:
- ACCELEROMETER 2-8G I2C/SPI 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:10,743
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
IIS328DQTR from STMicroelectronics is a high-performance, ultralow-power 3-axis MEMS accelerometer with digital SPI/I²C output, designed for industrial motion sensing in harsh environments. It delivers ±2g/±4g/±8g dynamically selectable full scale, 16-bit resolution, and operates from 2.16 V to 3.6 V supply across –40°C to +105°C. Its dual programmable interrupt generators and sleep-to-wake-up function enable intelligent power management in vibration monitoring and platform stabilization systems.
For engineers reviewing the IIS328DQTR datasheet, IIS328DQTR pinout, IIS328DQTR application, or IIS328DQTR equivalent, key selection criteria include its extended temperature operation, 10 μA low-power mode current, factory-calibrated sensitivity and zero-g offset, self-test capability, and QFPN-24L 4×4 mm package compatibility with space-constrained industrial PCBs.
Technical Context
The IIS328DQTR integrates a surface-micromachined capacitive sensing element with a low-noise charge amplifier and 12-bit ADC (16-bit output via data formatting), enabling DC-coupled acceleration measurement down to 0.5 Hz ODR. Its dual interrupt generators support independent configuration for inertial wake-up and free-fall detection on INT_1 and INT_2 pins.
Factory-trimmed sensitivity (e.g., 0.98 mg/digit at ±2g) and zero-g offset are stored in nonvolatile memory and auto-loaded at power-on. The device supports both 3-wire and 4-wire SPI modes and standard/fast-mode I²C (up to 400 kHz), with CS pin selecting interface protocol and SA0 configuring I²C slave address LSB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.16 V to 3.6 V - Enables direct integration with 3.3 V industrial rails and compatibility with wide-input PMICs. |
| Low-Power Mode Current | 10 μA at 1 Hz ODR - Sustains battery-operated logging for months without compromising wake-up responsiveness. |
| Full-Scale Range | ±2g / ±4g / ±8g (user-selectable) - Allows dynamic trade-off between resolution (0.98 mg/digit at ±2g) and range for tilt vs. impact applications. |
| Output Data Rate | 0.5 Hz to 1 kHz - Supports slow-motion tilt tracking and fast transient event capture (e.g., shock detection). |
| Interface Support | SPI (3-/4-wire) and I²C (100/400 kHz) - Dual-protocol flexibility simplifies host MCU interface selection without external level shifters. |
| Operating Temperature | –40°C to +105°C - Qualified for under-hood automotive, industrial motor control, and outdoor infrastructure deployments. |
| Self-Test Output Change | X: –800 LSb, Y: +800 LSb, Z: +600 LSb (at ±2g) - Enables in-system 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 circuitry; VDD_IO supplies I/O buffers - allows independent rail control for voltage translation. |
| 6, 8, 9, 10 | GND | Four dedicated ground terminals minimize noise coupling and improve ADC reference stability. |
| 3, 7 | INT_2 / INT_1 | Dedicated open-drain interrupt outputs - configurable independently for wake-up, free-fall, or data-ready events. |
| 11, 12, 15, 16 | SCL/SPC, CS, SDO/SA0, SDA/SDI/SDO | Multiplexed I²C/SPI interface pins - CS = 1 selects I²C; SA0 sets LSB of I²C address (0011000b or 0011001b). |
| 1, 2, 4, 13, 17–24 | NC / Reserved | No-connect or reserved pins - must be left floating or tied per datasheet (e.g., Pin 4 to GND, Pin 13 to VDD). |
Key Features
| Feature | Design Value |
|---|---|
| Dual Programmable Interrupt Generators | Independent configuration of INT_1 and INT_2 for simultaneous wake-up and free-fall detection without host polling. |
| Embedded Self-Test | Electrostatic actuation verifies sensor functionality and signal chain integrity in final application without physical movement. |
| Factory Calibration | Sensitivity and zero-g offset trimmed and stored in NVM - eliminates need for system-level calibration in production. |
| Sleep-to-Wake-Up Mode | Automatically transitions from 10 μA low-power mode to full-bandwidth operation upon inertial event detection. |
| High Shock Survivability | Withstands 10,000 g shocks (0.1 ms) - suitable for deployment in machinery subject to hammering, drop testing, or explosive environments. |
Applications
| Antitampering & Impact Logging | Vibration Monitoring |
|---|---|
|
Use Scenario: Detect unauthorized physical access or mechanical tampering on secure enclosures or utility meters. IC Role / Device Role / Timing Role: Accelerometer providing threshold-triggered interrupt on sudden acceleration transients (>2g peak). Use Value: Enables immediate system lockdown or alert transmission using only 10 μA background current until event occurs. |
Use Scenario: Continuous monitoring of bearing vibration spectra in industrial pumps or motors for predictive maintenance. IC Role / Device Role / Timing Role: High-stability 3-axis sensor capturing low-frequency (<100 Hz) acceleration waveforms at 1 kHz ODR. Use Value: Factory-calibrated sensitivity (±0.01 %/°C TCSo) ensures consistent amplitude accuracy across ambient temperature swings. |
| Platform Stabilization | Tilt & Inclination Sensing |
|
Use Scenario: Real-time correction of antenna pointing error due to wind-induced mast sway or vehicle motion. IC Role / Device Role / Timing Role: Low-noise (218 μg/√Hz) DC-coupled accelerometer feeding closed-loop servo controller. Use Value: Extended –40°C to +105°C operation maintains calibration integrity in outdoor telecom base stations. |
Use Scenario: Determining pitch/roll angle of construction equipment or agricultural machinery on uneven terrain. IC Role / Device Role / Timing Role: ±2g full-scale mode delivering 0.98 mg/digit resolution for sub-degree inclination accuracy. Use Value: Embedded high-pass filter eliminates thermal drift effects on zero-g offset during long-term static measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-axis industrial accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LSM6DSOXTR | Integrated 6-axis IMU (accel + gyro); higher current (350 μA typical); supports machine learning core. | Better for motion fusion and gesture recognition; less optimal for pure low-power tilt-only use cases. | Choose when angular rate data and AI-based classification are required alongside acceleration. |
| ADXL355BCPZ-RL7 | Analog output; ultra-low noise (25 μg/√Hz); wider supply (2.25–3.6 V); no embedded interrupts. | Superior for precision seismic or structural health monitoring; requires external ADC and interrupt logic. | Choose when nanograde noise performance outweighs digital integration and interrupt autonomy. |
Compared with LSM6DSOXTR and ADXL355BCPZ-RL7, the IIS328DQTR uniquely balances ultralow power (10 μA), autonomous dual-interrupt capability, and industrial temperature resilience in a compact QFPN package-making it optimal for standalone, event-driven industrial sensing where size, power, and reliability are co-prioritized.
Availability
IIS328DQTR is available at Aetrix Electronics and suitable for antitampering devices, vibration monitoring systems, and platform stabilization applications requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for IIS328DQTR 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 microcontrollers, sensors, power management, and automotive ICs.
The IIS328DQTR belongs to ST's industrial-grade MEMS accelerometer product line, engineered specifically for robustness, long-term calibration stability, and seamless integration into harsh-environment embedded systems.
FAQ
What is the maximum SPI clock frequency supported by the IIS328DQTR?
The IIS328DQTR supports SPI clock frequencies up to 10 MHz, with guaranteed timing parameters (e.g., 100 ns minimum SPC cycle time) validated at that speed. Operation beyond 10 MHz is not characterized or recommended, as setup/hold margins degrade and may cause communication errors.
Can the IIS328DQTR operate with separate VDD and VDD_IO voltages?
Yes - VDD (2.16–3.6 V) powers the internal analog and digital core, while VDD_IO (1.71 V to VDD+0.1 V) supplies only the I/O buffers. This enables interfacing with 1.8 V MCUs while maintaining full sensor performance, and allows VDD removal while preserving I²C/SPI bus accessibility.
How is the self-test function verified in-system?
The self-test applies an electrostatic force to the MEMS structure, producing predictable output shifts: –800 LSb (X), +800 LSb (Y), +600 LSb (Z) at ±2g full scale. By reading the OUT registers before and after enabling CTRL_REG4.ST=1, users confirm functionality if changes fall within datasheet tolerances.
Does the IIS328DQTR require external decoupling capacitors?
Yes - ST recommends placing a 100 nF ceramic capacitor and a 10 µF aluminum (or tantalum) capacitor as close as possible to Pin 5 (VDD). This dual-capacitor network suppresses high- and low-frequency supply noise, ensuring stable ADC reference and minimizing measurement drift during dynamic events.
IIS328DQTR 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:
- 2.16V ~ 3.6V
- Features:
- Adjustable Bandwidth, Selectable Scale, Sleep Mode
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
IIS328DQTR FAQ
1.How can I place an order for IIS328DQTR through Aetrix?
Please submit a Request for Quotation (RFQ) for IIS328DQTR 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 IIS328DQTR reliable?
The price and inventory of IIS328DQTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IIS328DQTR is usually 5 days.
3.What payment methods are accepted for IIS328DQTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IIS328DQTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IIS328DQTR?
IIS328DQTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IIS328DQTR 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 IIS328DQTR?
For technical support, including IIS328DQTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IIS328DQTR requirements.
6.How does Aetrix verify that IIS328DQTR is sourced from the original manufacturer or authorized distributors?
All IIS328DQTR 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 IIS328DQTR meets industry standards.
7.What is the process for return or replacement of IIS328DQTR?
All IIS328DQTR units undergo pre-shipment inspection (PSI). If there is an issue with IIS328DQTR, 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 IIS328DQTR part is unused and in its original packaging.
Return procedure for IIS328DQTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IIS328DQTR Tags
-
MXC4005XC
Memsic Inc.
-
MC3419
Memsic Inc.
-
MC3479
Memsic Inc.
-
MXC6655XA
Memsic Inc.
-
MC3630
Memsic Inc.
.jpg)
-
LIS2HH12TR
STMicroelectronics
-
KX122-1037
Kionix Inc.
-
LIS2DE12TR
STMicroelectronics
-
LIS2DH12TR
STMicroelectronics
-
MC3635
Memsic Inc.
-
LIS2DS12TR
STMicroelectronics
-
LIS3DHTR
STMicroelectronics
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
