BMI055

@@ -0,0 +1,51 @@+# BMI055++**Bosch Sensortec** · Attitude Sensor/Gyroscope · LGA-16(3x4.5)++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](docs/bmi055-datasheet.pdf) (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](docs/bmi055-datasheet.pdf)

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