A 6-axis inertial measurement unit in a 3 x 2.5 mm LGA-14, combining a 3D accelerometer and 3D gyroscope in one package (ST's iNEMO line). The accelerometer covers plus/minus 2 to 16 g and the gyroscope plus/minus 125 to 2000 dps, both read over I2C or SPI, with a 4 KB smart FIFO that buffers samples so the host can sleep between reads. On-chip embedded functions (pedometer, step detector and counter, tilt, and significant-motion) offload always-on motion tracking, and two interrupt pins signal events. It is a low-power staple for wearables, drones, game controllers, and gesture input. This page is sourced from the current LSM6DS3TR-C datasheet. Runs 1.71-3.6 V.

Pinout

Pin	Name	Type	Function
1	SDO/SA0	bidirectional	SPI 4-wire serial data output (SDO) when SPI is selected. In I²C mode this pin sets the least significant bit of the 7-bit device slave address (SA0), giving two selectable I²C addresses on a single bus.
2	SDx	bidirectional	Mode 1: not used, must be tied to VDDIO or GND. Mode 2: I²C master serial data (MSDA) for the built-in sensor hub connecting external MEMS peripherals (magnetometer, etc.).
3	SCx	bidirectional	Mode 1: not used, must be tied to VDDIO or GND. Mode 2: I²C master serial clock (MSCL) for the built-in sensor hub connecting external MEMS peripherals.
4	INT1	output	Programmable interrupt 1 output. Routes data-ready, FIFO, wake-up, free-fall, tap/double-tap, 6D/4D orientation, tilt, step-detector, significant-motion and other embedded-function events (mapping configured via INT1_CTRL / MD1_CFG).
5	VDDIO	power_in	Independent I/O supply pin (1.62 V typical, 1.71 V to 3.6 V analog VDD range allows level-shifted digital rails). A 100 nF filter capacitor is recommended.
6	GND	power_in	0 V ground return. Both GND pins (6 and 7) must be tied to the board ground plane.
7	GND	power_in	0 V ground return. Both GND pins (6 and 7) must be tied to the board ground plane.
8	VDD	power_in	Main analog supply, 1.71 V to 3.6 V. A 100 nF filter capacitor is recommended close to the pin.
9	INT2	bidirectional	Programmable interrupt 2 output / data-enable (DEN) input used to timestamp external events into the FIFO. In Mode 2 this pin can alternatively act as the I²C master external synchronization signal (MDRDY) indicating a new sample from a sensor-hub slave.
10	NC	unconnected	No internal connection. Leave electrically unconnected but solder to PCB for mechanical support.
11	NC	unconnected	No internal connection. Leave electrically unconnected but solder to PCB for mechanical support.
12	CS	input	I²C / SPI mode selection and SPI chip-select. CS = 1 selects I²C mode (SPI idle); CS = 0 enables SPI communication (I²C disabled). Must be driven high or tied to VDDIO if only I²C is used.
13	SCL/SPC	input	I²C serial clock (SCL) when I²C is selected, or SPI serial port clock (SPC) when SPI is selected. Muxed between the two host protocols by the CS pin.
14	SDA/SDI/SDO	bidirectional	I²C serial data (SDA) in I²C mode; SPI 4-wire serial data input (SDI) in SPI mode; SPI 3-wire bidirectional serial data (SDO) when SIM = 1 (3-wire SPI). Function selected by CS and SIM configuration.

Key specifications

Parameter	Value
Type	6-axis IMU (accel + gyro)
Accelerometer	±2/±4/±8/±16 g
Gyroscope	±125 to ±2000 dps
Interface	I2C + SPI
FIFO	4 KB smart FIFO
Embedded	pedometer, tilt, significant-motion
Supply voltage	1.71-3.6 V
Package	LGA-14 (3 x 2.5 mm)

Ordering variants

Same part, different packaging or reel option.

LSM6DS3TR-C (LGA-14)
LSM6DS3 (LGA-14)

CAD (KiCad official)

Symbol: Sensor_Motion:LSM6DS3
Footprint: Package_LGA:LGA-14_3x2.5mm_P0.5mm_LayoutBorder3x4y
3D model: LGA-14 (KiCad packages3D)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: STMicroelectronics datasheet (115 pp, sha256 251737db70e3b6cd, retrieved 2026-08-17, tier: manufacturer)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF