# LIS331HHTR

**STMicroelectronics** · Accelerometers · LGA-16(3x3)

LIS331HHTR from STMicroelectronics, in a LGA-16(3x3). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | Vdd_IO | power_in | Power supply for the I/O pins, with Vdd_IO specified from 1.71 V to Vdd+0.1 V. |
| 2 | NC | unconnected | Not connected; the datasheet gives no function for this pin. |
| 3 | NC | unconnected | Not connected; the datasheet gives no function for this pin. |
| 4 | SCL/SPC | input | I2C serial clock (SCL) when CS is high, or SPI serial port clock (SPC) when SPI is enabled. |
| 5 | GND | power_in | 0 V supply. |
| 6 | SDA/SDI/SDO | bidirectional | I2C serial data (SDA), SPI serial data input (SDI), or 3-wire interface serial data output (SDO), depending on the selected interface. |
| 7 | SDO/SA0 | bidirectional | SPI serial data output (SDO) in SPI mode, or I2C least significant bit of the device address (SA0), which sets the address to 0011001b when tied to supply and 0011000b when tied to ground. |
| 8 | CS | input | I2C/SPI mode selection: 1 selects I2C mode and 0 enables SPI; CS must be tied high (to Vdd_IO) when using I2C. |
| 9 | INT 2 | output | Inertial interrupt 2, whose function, threshold and timing are user-programmable through the I2C/SPI interface. |
| 10 | Reserved | passive | Reserved pin that must be connected to GND. |
| 11 | INT 1 | output | Inertial interrupt 1, whose function, threshold and timing are user-programmable through the I2C/SPI interface. |
| 12 | GND | power_in | 0 V supply. |
| 13 | GND | power_in | 0 V supply. |
| 14 | Vdd | power_in | Power supply for the device core, with the operational supply range stated as 2.16 V to 3.6 V; decoupling capacitors should be placed as near as possible to this pin. |
| 15 | Reserved | passive | Reserved pin that must be connected to Vdd. |
| 16 | GND | power_in | 0 V supply. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | LGA-16(3x3) |
| Category | Sensors |
| Pins | 16 |

## CAD (KiCad official)

- Symbol: `LIS331HHTR`
- Footprint: `Package_LGA:LGA-16_3x3mm_P0.5mm`
- 3D model: LGA-16(3x3) (KiCad packages3D, STEP)
- 3D model files: `lis331hhtr-etched.step` / `lis331hhtr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lis331hhtr.step` / `lis331hhtr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [STMicroelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588905294626246657) (37 pp, sha256 `0cdddc3ee6b44e0c`, retrieved 2026-10-11, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/lis331hhtr-datasheet.pdf)