# BME690 Molecule v2.0

KiCad 9 molecule breakout for the **Bosch BME690** — a 4-in-1 environmental sensor with gas (VOC), temperature, humidity, and barometric pressure sensing plus an on-chip AI gas scanner.

## Overview

| Parameter | Value |
|-----------|-------|
| IC | BME690 (Bosch Sensortec, LGA-8, 3x3 mm) |
| Interface | I2C (default addr 0x76, SDO to GND) |
| Board size | 8 x 8 mm |
| Passives | 0402 |
| LCSC PN | C42431867 |

## BOM

| Ref | Value | Package | LCSC |
|-----|-------|---------|------|
| U1 | BME690 | LGA-8 3x3 mm | C42431867 |
| R1, R2 | 2.2k (I2C pull-ups) | 0402 | C25879 |
| R3 | 10k (CSB pull-up) | 0402 | C25744 |
| C1, C2 | 100 nF (bypass) | 0402 | C1525 |

## Contacts

4 machine-pin contacts + 4 machine-contact pads for Adom baseboard integration.

## Design Notes

- I2C pull-ups are 2.2k — works for both 100 kHz and 400 kHz modes
- CSB tied high via 10k to select I2C mode (vs SPI)
- SDO tied to GND for I2C address 0x76
- Decoupling caps placed close to VDD and VDDIO pins
- Gas sensor inlet on top of IC — keep clear of conformal coating and enclosure obstructions

## Source

- **GitHub**: [adom-inc/bosch-molecules/BME690_Molecule](https://github.com/adom-inc/bosch-molecules/tree/main/BME690_Molecule)
- **Designed in**: KiCad 9