BMI325 from Bosch Sensortec, in a LGA-14(2.5x3). Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	SDO	bidirectional	SPI 4-wire serial data output (SDO). In I²C mode, this pin selects I²C address bit-0 (tie to GND for the default I²C address). Should be left DNC in SPI 3-wire mode.
2	NC	unconnected	No connect. Leave floating (do not connect).
3	NC	unconnected	No connect. Leave floating (do not connect).
4	INT1	bidirectional	Programmable interrupt pin 1. Used for motion-triggered interrupt output (data ready, tap, orientation, etc.); can be configured as push-pull/open-drain, active-high/low.
5	VDDIO	power_in	Digital I/O supply voltage. Operating range 1.08 V ... 3.63 V. Independent from analog VDD. A 100 nF decoupling capacitor is recommended.
6	GNDIO	power_in	Ground reference for the digital I/O supply (VDDIO) domain.
7	GND	power_in	Ground reference for the digital and analog (VDD) domains.
8	VDD	power_in	Main analog and digital supply voltage. Operating range 1.71 V ... 3.63 V. A 100 nF decoupling capacitor is recommended.
9	INT2	bidirectional	Programmable interrupt pin 2. Second configurable motion/data-ready interrupt output.
10	NC	unconnected	No connect. Leave floating (do not connect).
11	NC	unconnected	No connect. Leave floating (do not connect).
12	CSB	input	Active-low chip select for SPI mode (4-wire or 3-wire). Must be tied to VDDIO to select I²C/I3C interface mode at startup.
13	SCx	input	Serial clock input. Functions as SCK (SPI serial clock, up to 10 MHz) in SPI modes and as SCL (I²C/I3C serial clock, up to 1 MHz I²C Fm+ / 12.5 MHz I3C) in I²C/I3C mode.
14	SDx	bidirectional	Serial data pin. SDI (SPI 4-wire input), SDIO (SPI 3-wire bidirectional data), or SDA (I²C/I3C bidirectional data).

Key specifications

Parameter	Value
Manufacturer	Bosch Sensortec
Package	LGA-14(2.5x3)
Category	Sensor
Pins	14

Ordering variants

Same part, different packaging or reel option.

BMI3250 273 017 029

CAD (KiCad official)

Symbol: BMI325
Footprint: Package_LGA:Bosch_LGA-14_3x2.5mm_P0.5mm
3D model: LGA-14(2.5x3) (KiCad packages3D, STEP)

Provenance

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

Datasheet: Bosch Sensortec datasheet (239 pp, sha256 f06c5864abdb2b53, retrieved 2026-08-17, tier: lcsc)
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