BNO055 from Bosch Sensortec, in a LGA-28(3.8x5.2). 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	PIN1	unconnected	Reserved / do not connect. Leave floating on PCB.
2	GND	power_in	Analog / core ground reference for the VDD supply domain.
3	VDD	power_in	Main analog/core supply. Operating range 2.4 V to 3.6 V; decouple with 100 nF close to the pin.
4	nBOOT_LOAD_PIN	input	Bootloader mode select, active low. Pull low during reset/power-on to enter the internal bootloader; leave high (typ. 10 kΩ pull-up) for normal firmware execution.
5	PS1	input	Protocol select bit 1. Combined with PS0 chooses the host interface: I2C standard (PS1=GNDIO, PS0=GNDIO), UART (PS1=VDDIO, PS0=GNDIO), or HID-I2C (PS1=GNDIO, PS0=VDDIO).
6	PS0	input	Protocol select bit 0. Combined with PS1 to choose I2C, UART, or HID-I2C interface mode.
7	PIN7	unconnected	Reserved / do not connect.
8	PIN8	unconnected	Reserved / do not connect.
9	CAP	passive	Internal LDO decoupling node. Connect a 6.8 nF external capacitor to GND as shown in the connection diagram.
10	BL_IND	output	Boot loader indicator digital output. Signals bootloader activity; may be left unconnected (DNC in normal operation).
11	nRESET	input	Chip reset input, active low. Pulling low for at least 20 ns triggers a hardware reset. Typically pulled to VDDIO in normal operation.
12	PIN12	unconnected	Reserved / do not connect.
13	PIN13	unconnected	Reserved / do not connect.
14	INT	output	Interrupt output. Driven high on any enabled interrupt condition and latched until cleared by the host via the INT_STA register.
15	PIN15	power_in	Connect to GNDIO (digital I/O ground).
16	PIN16	power_in	Connect to GNDIO (digital I/O ground).
17	COM3	input	Digital interface pin 3. In I2C mode selects the 7-bit slave address (0x28 when tied low, 0x29 when tied high). In UART and HID-I2C modes tie to GNDIO.
18	COM2	bidirectional	Digital interface pin 2. Unused in the documented modes; tie to GNDIO for UART and HID-I2C modes.
19	COM1/SCL/Rx	bidirectional	Digital interface pin 1. Serves as I2C SCL (clock, open-drain) in I2C and HID-I2C modes, or as UART Rx input when PS pins select UART.
20	COM0/SDA/Tx	bidirectional	Digital interface pin 0. Serves as I2C SDA (data, open-drain) in I2C and HID-I2C modes, or as UART Tx output when PS pins select UART.
21	PIN21	unconnected	Reserved / do not connect.
22	PIN22	unconnected	Reserved / do not connect.
23	PIN23	unconnected	Reserved / do not connect.
24	PIN24	unconnected	Reserved / do not connect.
25	GNDIO	power_in	Digital I/O ground reference for the VDDIO domain.
26	XOUT32	output	Optional 32 kHz crystal oscillator output. Connect to an external 32.768 kHz crystal for improved timing; leave open if unused.
27	XIN32	input	Optional 32 kHz crystal oscillator input. Connect the other terminal of the 32.768 kHz crystal here; leave open if unused.
28	VDDIO	power_in	Digital I/O and internal MCU/interface supply. Operating range 1.7 V to 3.6 V; decouple with 100 nF close to the pin.

Key specifications

Parameter	Value
Manufacturer	Bosch Sensortec
Package	LGA-28(3.8x5.2)
Category	Sensor
Pins	28

CAD (KiCad official)

Symbol: BNO055
Footprint: Package_LGA:LGA-28_5.2x3.8mm_P0.5mm
3D model: LGA-28(3.8x5.2) (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`bno055.step`	225 KB	You want the bare part, or you mark your own boards.
`bno055-etched.step`	1.5 MB	You want the part with `BNO055` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 411 faces against 148 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: Bosch Sensortec datasheet (106 pp, sha256 20c83174fef87553, 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