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BQ76952 BMS Molecule v2

Public Made by Adom

by adom

Adom molecule for the TI BQ76952 battery management IC with charge/discharge FET control, cell balancing, and protection. The brain of the Modular BMS system.

hardwaremoleculebmsbq76952battery-managementtimosfetprotectionbalancing
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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