ICM-42631 from TDK InvenSense, 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	AP_SDO/AP_AD0	bidirectional	AP SPI serial data output (4-wire SPI mode) or I3C/I2C slave address LSB. Pull-up/pull-down disabled by default; configurable via PIN1_PU_EN / PIN1_PD_EN (register 0x0Eh in Bank 3).
2	AUX1_SDIO/AUX1_SDI	bidirectional	AUX1 SPI serial data I/O (3-wire mode) or AUX1 SPI serial data input (4-wire mode). In single-interface mode, connect to VDDIO or GND. Pull-up configurable via PIN2_PU_EN.
3	AUX1_SCLK	input	AUX1 SPI serial clock. In single-interface mode, connect to VDDIO or GND. Pull-up configurable via PIN3_PU_EN.
4	INT1/INT	output	Interrupt 1 output; can be configured as push-pull or open-drain. In single-interface mode INT maps all interrupts to pin 4. Pull-down configurable via PIN4_PD_EN.
5	VDDIO	power_in	I/O power supply voltage, 1.71 V to 3.6 V DC. Requires a 10 nF X7R bypass capacitor (C3) to GND per typical operating circuit.
6	GND	power_in	Power supply ground return.
7	AUX2_CS/RESV	input	In triple-interface mode: AUX2 SPI chip select (active low). In single/dual-interface mode: RESV - must be connected to GND. Pull-up disabled by default in single/dual mode and enabled by default in triple mode.
8	VDD	power_in	Core analog supply voltage, 1.71 V to 3.6 V DC. Requires 0.1 µF (C1) and 2.2 µF (C2) X7R bypass capacitors to GND per typical operating circuit.
9	INT2/FSYNC/AUX2_SDIO	bidirectional	In single/dual-interface mode: INT2 interrupt output (push-pull or open-drain), or FSYNC frame sync input (tie to GND if unused). In triple-interface mode: AUX2 SPI serial data I/O. PIN9_AUX2_PD_EN must be 0 when triple-interface mode is used.
10	AUX1_CS/NC	input	AUX1 SPI chip select (active low) in dual- and triple-interface modes. Not connected in single-interface mode. Pull-up enabled by default in single-interface mode and disabled in dual/triple-interface mode; configurable via PIN10_PU_EN.
11	AUX1_SDO/AUX2_SCLK	bidirectional	In dual-interface mode: AUX1 SPI serial data output (4-wire); NC when 3-wire is used for AUX1. In triple-interface mode: AUX2 SPI serial clock. In single-interface mode: connect to VDDIO or NC. Pull-up configurable via PIN11_PU_EN.
12	AP_CS	input	AP SPI chip select (active low) when the host interface is SPI. Connect to VDDIO when using the I3C/I2C interface. Pull-up enabled by default; configurable via PIN12_PU_EN / PIN12_PD_EN.
13	AP_SCL/AP_SCLK	input	AP I3C/I2C serial clock (AP_SCL) or AP SPI serial clock (AP_SCLK), selected by host interface mode. Supports 12.5 MHz I3C, 1 MHz I2C, and 24 MHz SPI. Pull-up/pull-down configurable via PIN13_PU_EN / PIN13_PD_EN.
14	AP_SDA/AP_SDIO/AP_SDI	bidirectional	AP I3C/I2C serial data (AP_SDA), AP SPI serial data I/O (AP_SDIO, 3-wire), or AP SPI serial data input (AP_SDI, 4-wire), selected by host interface mode. Pull-up/pull-down configurable via PIN14_PU_EN / PIN14_PD_EN.

Key specifications

Parameter	Value
Manufacturer	TDK InvenSense
Package	LGA-14(2.5x3)
Category	Sensor
Pins	14

Ordering variants

Same part, different packaging or reel option.

ICM-42631

CAD (KiCad official)

Symbol: ICM-42631
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: TDK InvenSense datasheet (134 pp, sha256 3456fbe839202657, 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