BMI055 from Bosch Sensortec, in a LGA-16(3x4.5). 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	INT2	output	Accelerometer interrupt pin #2. Digital output; programmable push-pull or open-drain, active level configurable. If not used, leave disconnected (DNC).
2	NC	unconnected	Not connected internally. Datasheet connection diagrams tie this pin to GND.
3	VDD	power_in	Main analog and digital domain power supply. Operating range 2.4 V to 3.6 V; absolute max 4.25 V. Decouple with a bypass capacitor to GND close to the pin.
4	GNDA	power_in	Analog domain ground. Connect to the system ground plane.
5	CSB2	input	Gyroscope SPI chip-select (active-low). In I²C mode this pin is not used and must be left floating (DNC).
6	GNDIO	power_in	Digital I/O ground return. Connect to the system ground plane.
7	PS	input	Protocol select input. Tie to GND for SPI interface mode, or tie directly to VDDIO for I²C mode. Must be a solid electrical connection for reliable protocol selection.
8	SCx	input	Serial clock: SPI SCK in SPI 4W/3W mode, I²C SCL in I²C mode. Digital input driven by the host.
9	SDx	bidirectional	Serial data I/O. SPI 4W: SDI (data in). SPI 3W: SDA (bidirectional). I²C: SDA (bidirectional).
10	SDO2	bidirectional	Gyroscope SPI serial data out (SPI 4-wire). In I²C mode this pin selects the gyroscope I²C address (tie to GND for default address). In SPI 3-wire mode leave floating (DNC).
11	VDDIO	power_in	Digital I/O supply voltage. Operating range 1.2 V to 3.6 V; absolute max 4.25 V. May be powered independently of VDD.
12	INT3	bidirectional	Gyroscope interrupt pin #1. Digital I/O; primarily a motion-triggered interrupt output but can also serve as an external wake-up trigger input in some power modes. If not used, leave disconnected (DNC).
13	INT4	bidirectional	Gyroscope interrupt pin #2. Digital I/O; primarily a motion-triggered interrupt output but can also serve as an external wake-up trigger input in some power modes. If not used, leave disconnected (DNC).
14	CSB1	input	Accelerometer SPI chip-select (active-low). In I²C mode this pin is not used and must be left floating (DNC).
15	SDO1	bidirectional	Accelerometer SPI serial data out (SPI 4-wire). In I²C mode this pin selects the accelerometer I²C address (tie to GND for default address). In SPI 3-wire mode leave floating (DNC).
16	INT1	output	Accelerometer interrupt pin #1. Digital output; programmable push-pull or open-drain, active level configurable. If not used, leave disconnected (DNC).

Key specifications

Parameter	Value
Manufacturer	Bosch Sensortec
Package	LGA-16(3x4.5)
Category	Sensor
Pins	16

CAD (KiCad official)

Symbol: BMI055
Footprint: Package_LGA:Bosch_LGA-16_4.5x3mm_P0.5mm_LayoutBorder7x1y_ClockwisePinNumbering
3D model: LGA-16(3x4.5) (KiCad packages3D, STEP)

Provenance

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

Datasheet: Bosch Sensortec datasheet (149 pp, sha256 64ced53ae5be693b, 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