# BQ76952 BMS Molecule v2

Adom molecule for the Texas Instruments BQ76952 battery management IC. This is the central controller of the Modular BMS system — it monitors cell voltages, controls charge/discharge FETs, handles cell balancing, and provides comprehensive protection (OV, UV, OCD, SCD).

## Features

- TI BQ76952 battery monitor/protector (3-16S)
- BQ771807 high-side MOSFET driver
- BSC160N15NS5 / BSZ900N15NS3 power MOSFETs for CHG/DSG control
- Cell balancing support
- Full protection suite: OV, UV, OCD, SCD, OT
- I2C interface to host MCU (MSP430)
- Multi-sheet KiCad 8 schematic (Monitor, FETs, Interface, Hardware, PinConfig)

## Schematic Sheets

| Sheet | Contents |
|-------|----------|
| BMS029B_Monitor | BQ76952 IC, cell voltage sense, thermistors, decoupling |
| BMS029B_FETs | CHG/DSG MOSFET bank, gate drivers, current sense |
| BMS029B_Interface | I2C/UART connectors, MSP430 interface, debug headers |
| BMS029B_Hardware | Board-level: fiducials, mounting, compliance markings |
| BMS029B_PinConfig | Pin configuration and mapping |

## Key ICs

| Ref | Value | Description |
|-----|-------|-------------|
| — | BQ76952 | 3-16S battery monitor and protector |
| — | BQ771807DPJR | High-side N-FET driver |
| — | BSC160N15NS5ATMA1 | 150V N-channel MOSFET (power stage) |
| — | BSZ900N15NS3 G | 150V N-channel MOSFET (power stage) |
| — | MMBT5401LT1G | PNP transistor (gate drive) |
| — | FCX495TA | NPN transistor |

## Usage

This molecule is the brain of the **Modular BMS** system. It connects to battery carrier molecules (18650 or EVE LF105 prismatic) via cell sense lines and controls charge/discharge through integrated MOSFET banks. An MSP430 host MCU communicates over I2C to configure the BQ76952 and read telemetry.

## Source

- GitHub: [adom-inc/Modular_BMS](https://github.com/adom-inc/Modular_BMS/tree/main/Molecule_BQ76952%20-%20v2)