The BQ40Z50RSMR - R1 is an advanced battery management chip launched by Texas Instruments (TI), 

designed specifically for 1 - 4 - cell lithium - ion/polymer battery packs. Its functions and applications are as follows:

Functions

• Accurate Power Monitoring: It adopts the patented Impedance Track™ technology to accurately measure the available 
• power in lithium - ion and lithium - polymer batteries. Using integrated high - performance analog peripherals, 
• it can measure the available capacity, voltage, current, temperature, and other key parameters of the battery, 
• retain accurate data records, and report this information to the system host controller through the SMBus v1.1 compatible interface.
• Integrated Protection Features: It provides software - based level 1 and level 2 safety protection to prevent over - voltage, 
• under - voltage, over - current, short - circuit, overload, over - heat, and other battery pack and battery - 
• related faults. It also has a high - side N - channel protection field - effect transistor (FET) drive.
• Cell Balancing: It supports integrated cell balancing during charging or standby, 
• which helps to improve the overall performance and service life of the battery pack.
• Programmable Protection Thresholds and Delays: It has a complete array of programmable protection features, including voltage, 
• current, temperature, charge timeout, etc., which can be set according to specific application requirements.
• Battery Life Prediction and Health Monitoring: It can monitor the state of health (SOH) of the battery and predict the battery life, 
• providing users with relevant information about the battery's health status.
• Support for Turbo Boost Mode: It can provide the maximum power and current to the host system, 
• supporting Turbo boost mode, which is beneficial for applications that require short - term high - power output.
• Battery Trip Point (BTP) Support: It supports the battery trip point, 
• and can send a BTP interrupt signal to the host system at the preset charging threshold state,
•  so that the system can take corresponding actions in time.
• SHA - 1 Authentication: With the secure memory for authentication keys, 
• SHA - 1 authentication can identify genuine battery packs, which helps to prevent the use of counterfeit batteries and improve system security.
• Built - in Temperature Sensor and External Temperature Detection: It has a built - in temperature sensor and can also detect external temperature, 
• which can more comprehensively monitor the battery temperature and ensure the safe operation of the battery.
• LED Display: It supports LED display, which can visually display the battery status, such as remaining power, charging status, etc.

Applications

• Electric Vehicles: It is suitable for battery management systems in electric vehicles, 
• which can accurately monitor the power and status of the battery pack, 
• ensure the safe and efficient operation of the battery, and improve the endurance and performance of electric vehicles.
• Portable Devices: Such as laptops, tablets, smart phones, and other portable electronic devices. 
• It can effectively manage the battery in the device, improve battery life, 
• and ensure the normal operation of the device. At the same time, 
• its compact package is also suitable for the miniaturization requirements of portable devices.

• 
  

• BQ40Z50RSMR-R1 is a fuel gauge IC from Texas Instruments designed for battery management in portable devices like tablets. 

  Principle of Operation:

  1. Voltage & Current Measurement

     • The BQ40Z50 continuously monitors the battery's voltage, current (via a sense resistor), and temperature using its integrated ADC (Analog-to-Digital Converter).

     • Coulomb counting (current integration) tracks charge entering and leaving the battery.

  2. Impedance Track™ Technology

     • Texas Instruments' proprietary algorithm estimates the State of Charge (SoC) by analyzing:

       • Battery voltage under load

       • Charge/discharge current

       • Cell impedance (changes with aging and temperature)

     • Compensates for battery aging, temperature, and load variations.

  3. Communicating with the Host (Tablet)

     • The BQ40Z50 communicates via I²C/SMBus with the tablet's main processor (AP/SoC).

     • Standard Battery Management Bus (BMBus) protocols (e.g., SBS commands) relay:

       • Remaining capacity (RemainingCapacity())

       • State of Charge (StateOfCharge())

       • Battery health (StateOfHealth())

       • Voltage, current, and error flags.

  4. OS-Level Integration

     • The tablet's OS (Android/Windows) reads the fuel gauge data via a driver (e.g., Linux kernel's Power Supply subsystem or ACPI in Windows).

     • The OS then displays the battery percentage, estimates runtime, and triggers low-power warnings.

  5. Safety & Calibration

     • The BQ40Z50 includes protection against overcharge, over-discharge, and short circuits.

     • Periodic learning cycles (full charge/discharge) recalibrate the SoC estimation for accuracy.

  Key Components Involved:

  • Battery Pack: Contains Li-ion/Li-Po cells, NTC thermistor, and protection FETs.

  • BQ40Z50: Performs fuel gauging, cell balancing, and protection.

  • Host Processor: Interprets data and displays battery status.

  • OS & UI: Renders the battery icon and percentage.

  This ensures accurate, real-time battery level reporting while maximizing battery life and safety.

• Here's how it enables battery level display on a tablet:

The following parts are popular search parts in PMIC - Battery Management.

The following parts include "BQ40Z50RSMR-R1" in ISSI, Integrated Silicon Solution Inc“BQ40Z50RSMR-R1”.

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