+---------------------------------------------+ | BQ40370 | | (32-Pin VQFN Power Management Controller) | +--------------------+------------------------+ | +------------------+------------------+ | | v v +------------------+ +------------------+ | Safety & Protections | Gas Gauging Engine| | - Overvoltage (OVP) | - Impedance Track| | - Undervoltage (UVP) | - Cycle Counting | | - Overcurrent (OCD/OCC) | - FCC Calibration| | - Thermal Cutoff | - Cell Balancing | +------------------+ +------------------+ | | +------------------+------------------+ | v +-------------------------------+ | System Communication SMBus | | (Host Laptop & Firmware) | +-------------------------------+ Key Technical Functions BQ40370 FW V3.14 not calibrate correctly
The chip must be "unsealed" using specific commands, allowing access to memory registers. Clear Errors: Reset the charge/discharge FET errors.
The BQ40370 is a topic of great interest within the DIY and laptop repair community, primarily when dealing with old or non-functional batteries. Attempting to the chip is a common, though advanced, repair technique.
Schematic notes:
The bq40370 is a ROM-based device (firmware is fixed in ROM, not flash-programmable). Configuration is done via data flash parameters over I²C.
bq40370 is a high-side battery protector intended for use with single-cell and multi-cell lithium-ion and lithium-polymer battery packs. It integrates overcurrent, overvoltage, undervoltage, short-circuit, and thermal protection functions along with MOSFET gate drivers and status reporting. This document provides a detailed technical reference, design guidance, typical applications, electrical characteristics, timing diagrams, protection behavior, PCB layout recommendations, thermal considerations, and example circuits using bq40370.
: Unlike standard "IT" (Impedance Track) gauges, the bq40370 uses ACEDV , a hybrid method that provides high accuracy without requiring long "relaxation periods" (idle time) between cycles. bq40370
: If the battery provides zero voltage, the thermal fuse may be blown. It is typically located under the sticker near the battery connector.
Uses an SMBus-compatible interface for communication with the host system.
Fundamentally, the bq40370 is a fully integrated, single-chip fuel gauge and protector solution for Li-Ion and Li-Polymer battery packs. It acts as the "brain" of a smart battery, constantly monitoring its health and safety. Attempting to the chip is a common, though
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: TI Battery Management Studio (bqStudio) is the official framework, though it may require specific configuration files for custom firmware versions. Common Tasks :
: The SMBus line drops safety flags, completely shutting down both the Charge and Discharge Field-Effect Transistors (FETs). bq40370 is a high-side battery protector intended for
Unlike standard commercial-off-the-shelf fuel gauges, the BQ40370 relies on a hybrid micro-architecture that bridges legacy techniques with advanced algorithmic computation.