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STMicroelectronics LIS2DETR
- Part No.:
- LIS2DETR
- Manufacturer:
- STMicroelectronics
- Category:
- Accelerometers
- Package:
- 14-VFLGA
- Datasheet:
-
LIS2DETR.pdf
- Description:
- ACCEL 2-16G I2C/SPI 14LGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,396
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Product details
Overview
LIS2DETR from STMicroelectronics is a MEMS 3-axis digital accelerometer in ultra-low-power "femto" family, functioning as motion-sensing front-end for portable electronics. It delivers ±2g/±4g/±8g/±16g dynamically selectable full-scale ranges, 8-bit output resolution, and supports I²C/SPI interfaces with power consumption as low as 2 μA in ultra-low-power mode - enabling battery-sensitive applications like pedometers and display orientation.
For engineers reviewing the LIS2DETR datasheet, LIS2DETR pinout, LIS2DETR application, or LIS2DETR equivalent, key selection criteria include programmable interrupt thresholds for free-fall/motion detection, embedded 32-level FIFO for host processor offloading, 6D/4D orientation recognition, and integrated temperature sensor for thermal compensation in consumer and industrial motion systems.
Technical Context
The LIS2DETR implements a capacitive MEMS sensing element with signal-conditioning ASIC, supporting configurable output data rates from 1 Hz to 5 kHz. Its dual interrupt generators (IG1/IG2) operate independently with user-programmable thresholds, duration, and source logic (e.g., high-pass filtered vs. raw acceleration).
It integrates a 32-level FIFO buffer with four operational modes (bypass, FIFO, stream, stream-to-FIFO), plus dedicated registers for click/double-click detection (TIME_LIMIT, TIME_LATENCY, TIME_WINDOW), self-test activation, and temperature measurement via OUT_TEMP_L/H registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.71 V to 3.6 V - enables direct integration with Li-ion battery-powered systems without LDO overhead. |
| I/O Supply | 1.8 V independent - decouples digital interface voltage from core supply, simplifying mixed-voltage board design. |
| Ultra-Low-Power Mode | 2 μA typical - extends battery life in always-on motion wake-up applications such as smartwatch lift-to-wake. |
| Full-Scale Range | ±2g/±4g/±8g/±16g dynamic selection - allows runtime trade-off between resolution and range per use case (e.g., ±2g for precision tilt, ±16g for impact logging). |
| Output Interface | I²C (standard/fast-mode) and SPI (3- or 4-wire) - provides flexibility for host MCU compatibility and noise immunity in dense PCB layouts. |
| FIFO Depth | 32-level first-in-first-out - reduces host polling frequency and CPU wake-ups during burst motion capture (e.g., step counting). |
| Shock Survivability | 10,000 g - ensures mechanical robustness in drop-prone handheld devices without calibration drift. |
Pinout & Package
LIS2DETR is housed in a 2.0 mm × 2.0 mm × 1.0 mm LGA-14 (land grid array) package with exposed pad for thermal and mechanical stability. The package is RoHS-compliant and qualified for operation from –40 °C to +85 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Core supply input | Connects to 1.71–3.6 V main power rail; internal regulator supplies analog and digital blocks. |
| VDD_IO | I/O supply input | Supplies 1.8 V to digital interface pins (SDA/SCL/MOSI/MISO/SCK/CS); isolates I/O logic from core voltage variations. |
| GND | Ground reference | Common return path for analog, digital, and I/O sections; must be low-impedance and tied to exposed pad. |
| SCL / SCK | Clock input | I²C serial clock (SCL) or SPI serial clock (SCK); accepts standard timing per respective protocol spec. |
| SDA / MOSI | Data I/O | Bidirectional I²C data line or SPI master-out-slave-in; level-shifted to VDD_IO voltage domain. |
| MISO | Data output | SPI master-in-slave-out; active only when CS is low and read command issued. |
| CS | Chip select | Active-low enable for SPI communication; pulled high internally; must be controlled by host for multi-device buses. |
| INT1 / INT2 | Programmable interrupt outputs | Open-drain outputs driven by independent interrupt generators (free-fall, motion, 6D orientation, click); require external pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| 6D/4D orientation detection | Enables automatic screen rotation and UI reorientation using threshold-based position state machine without host-side computation. |
| Embedded self-test | Validates MEMS element and signal chain integrity in-system via register-controlled electrostatic actuation - critical for safety-critical wearables. |
| "Sleep-to-wake" function | Transitions autonomously from 2 μA standby to active measurement upon motion trigger - eliminates continuous polling and saves >95% average current. |
| Free-fall and motion interrupts | Two fully independent interrupt generators with separate thresholds, duration, and filtering - supports concurrent fall detection and activity monitoring. |
| Temperature sensor | Integrated analog temperature transducer with digital output (OUT_TEMP_L/H); used for real-time bias compensation of accelerometer offset over temperature. |
Applications
| Smartphone Display Rotation | Pedometer Motion Capture |
|---|---|
Use Scenario: Automatic portrait/landscape switching based on device tilt angle. IC Role / Device Role / Timing Role: Primary 3-axis orientation sensor feeding real-time angular position data to application processor. Use Value: Enables seamless UI adaptation using 6D detection logic with <100 ms latency and no host CPU load during static orientation hold. |
Use Scenario: Step counting and activity classification in fitness trackers. IC Role / Device Role / Timing Role: Low-power motion event detector triggering host only on validated step transitions. Use Value: Achieves >12-month battery life via 2 μA sleep mode and FIFO-batched step data delivery at 25 Hz ODR. |
| Drop Impact Logging | Gaming Motion Input |
Use Scenario: Recording shock events exceeding 100 g during equipment transport or device drops. IC Role / Device Role / Timing Role: High-g survivable inertial recorder capturing peak acceleration magnitude and timestamp. Use Value: Maintains calibration integrity after 10,000 g shocks and logs transient events using FIFO-triggered interrupt to preserve pre-event context. |
Use Scenario: Tilt-based steering and gesture control in mobile VR games. IC Role / Device Role / Timing Role: Real-time motion input engine delivering sub-10 ms latency 8-bit XYZ samples at 500 Hz. Use Value: Supports responsive in-game vehicle control via dynamic full-scale switching (±2g for fine steering, ±8g for aggressive maneuvers). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-axis MEMS accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LIS3DHTR | Higher current draw (8 μA LP mode), 12-bit output, wider ODR range (up to 10 kHz), larger LGA-16 package. | Better suited for high-resolution vibration analysis; less optimal for ultra-long-life coin-cell devices. | Select when higher resolution or extended bandwidth outweighs power budget constraints. |
| FXAS21002CQR1 | 3-axis gyroscope + accelerometer combo; 16-bit accelerometer output; 3.6 V max supply; no embedded FIFO. | Targets inertial measurement units (IMUs) requiring angular rate fusion, not standalone motion sensing. | Choose only if simultaneous rotation and acceleration data are required - adds complexity and cost for pure accelerometer use cases. |
Compared with LIS3DHTR and FXAS21002CQR1, the LIS2DETR offers the lowest quiescent current and smallest footprint for cost- and battery-sensitive motion-triggered functions, while sacrificing bit depth and gyro integration - making it ideal for entry-level wearable and portable consumer applications where power efficiency is primary.
Availability
LIS2DETR is available at Aetrix Electronics and suitable for pedometers, smartphone display orientation, and impact logging requiring stable component supply across high-volume consumer electronics production cycles.
Supply support for LIS2DETR 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.
The LIS2DETR belongs to ST's "femto" ultra-low-power MEMS accelerometer product line, engineered specifically for motion-activated power saving, orientation awareness, and intelligent wake-up in battery-constrained portable electronics.
FAQ
What is the maximum output data rate supported by the LIS2DETR?
The LIS2DETR supports output data rates from 1 Hz up to 5 kHz, configurable via CTRL_REG1 register. At 5 kHz, it delivers full 3-axis 8-bit samples continuously, enabling high-speed motion profiling for applications like vibration analysis or gesture recognition with minimal latency.
Does the LIS2DETR support both I²C and SPI simultaneously?
No - the LIS2DETR uses shared pins for I²C (SDA/SCL) and SPI (MOSI/MISO/SCK), requiring hardware configuration at power-up. The interface is selected by pulling SDA low (SPI mode) or high (I²C mode) during power-on reset; only one interface operates at a time.
How is the embedded temperature sensor calibrated?
The LIS2DETR's temperature sensor is factory-calibrated and provides 8-bit digital output via OUT_TEMP_L/H registers. Its sensitivity is approximately 1 LSB/°C centered at 25 °C, with offset trimmed during production - no end-user calibration is required for typical thermal compensation tasks.
Can the two interrupt pins (INT1/INT2) be configured for identical events?
Yes - both INT1 and INT2 can be independently programmed for the same event type (e.g., free-fall), but with different thresholds, durations, or filtering settings. This enables hierarchical alerting, such as low-threshold motion wake-up followed by high-threshold impact confirmation on separate pins.
LIS2DETR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 14-VFLGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Digital
- Axis:
- X, Y, Z
- Acceleration Range:
- ±2g, 4g, 8g, 16g
- Sensitivity (LSB/g):
- 64 (±2g) ~ 5 (±16g)
- Sensitivity (mV/g):
- -
- Bandwidth:
- 0.5Hz ~ 672kHz
- Output Type:
- I2C, SPI
- Voltage - Supply:
- 1.71V ~ 3.6V
- Features:
- Selectable Scale
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-LGA (2x2)
LIS2DETR FAQ
1.How can I place an order for LIS2DETR through Aetrix?
Please submit a Request for Quotation (RFQ) for LIS2DETR 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 LIS2DETR reliable?
The price and inventory of LIS2DETR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LIS2DETR is usually 5 days.
3.What payment methods are accepted for LIS2DETR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LIS2DETR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LIS2DETR?
LIS2DETR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LIS2DETR 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 LIS2DETR?
For technical support, including LIS2DETR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LIS2DETR requirements.
6.How does Aetrix verify that LIS2DETR is sourced from the original manufacturer or authorized distributors?
All LIS2DETR 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 LIS2DETR meets industry standards.
7.What is the process for return or replacement of LIS2DETR?
All LIS2DETR units undergo pre-shipment inspection (PSI). If there is an issue with LIS2DETR, 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 LIS2DETR part is unused and in its original packaging.
Return procedure for LIS2DETR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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