LC709204FXE-01TBG

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Description

The LC709204F is a fuel gauge for single-cell Li-ion/Polymer batteries. It is part of our family of smart Li-ion/Polymer battery fuel gauges that use its unique HG-CVR2 algorithm to measure the relative state of charge (RSOC) of the battery. The HG-CVR2 algorithm provides accurate RSOC information even under unstable conditions such as battery variation, temperature, load, aging, and self-discharge. Accurate RSOC helps extend the operating time of portable devices. The fuel gauge (also known as fuel gauge, battery monitor, or battery gauge) function of the HG-CVR2 algorithm enables this LSI to be used in a wide range of applications. After inserting the battery, the LSI can immediately start battery measurement by setting only a few parameters. This avoids tedious learning cycles and complex application manufacturing processes. This LSI also ensures battery safety through alarm functions and reporting SOH (State of Health) to the application processor. Its operating current is only 2A, which is very low, making it suitable for applications such as wearable devices and 1-series 1N parallel batteries.

Features

   1. HG-CVR2 algorithm technology

       - Small size: no current sense resistor required

       - Accurate RSOC (remaining capacity) for aged batteries

       - Stable measurement with automatic error convergence

       - Accurate measurement immediately after battery insertion

       - No learning cycle required

   2. Low power consumption

       - 2A operating current

   3. Improved battery safety with alarm function RSOC/voltage/temperature

   4. Battery life measurement SOH/cycle count/operating time

   5. Remaining time estimation Full charge time/discharge time

   6. Three temperature inputs

       - Input for detecting two NTC thermistors

       - Through I2C interface

   7. Battery operating status detection Charge/discharge

   8. Battery insertion detection

   9. I2C interface (supports up to 400 kHz)

 10. The devices are lead-free, halogen-free/BFR-free, and RoHS compliant

Applications

   1. Wearables/IoT devices

   2. Smartphones/PDA devices

   3. Digital camera

   4. Portable game console

   5. USB related devices

Pin configuration (WLCSP-12)

Typical application circuit

  ┌───────────────┐

  │  Li-ion battery             │

  └──────┬───────┘

                    │ 

    ┌────▼────┐             ┌───────┐

    │ BAT               │            │ MCU         │

    │                      ├─────┤ I2C           │

    │ TS                 │             └───────┘

    └────┬────┘

                 │

   10kΩ NTC thermistor

Register configuration example

     // Set alarm threshold (3.2V)

               i2c_write(0x16, 0x0B, 0xC8);

     // Read remaining power (%)

               soc = i2c_read(0x16, 0x02);

Design considerations

   1. PCB layout:

       - BAT traces must be kept away from high-frequency signals

       - WLCSP package must be designed with pads according to AN-1142 application note

   2. NTC selection:

       - Recommended MF52AT 10KΩ±1% (B value 3435K)

   3. Calibration process:

       - Complete charge and discharge cycle learning is required for first use

Certification information

   1. Industrial standard: Certified by IEC 62368-1

   2. Environmental certification: Compliant with JEDEC J-STD-020 lead-free standard

   3. Automotive certification: not supported by AEC-Q100

Development resources

   1. Evaluation board: EVAL-LC709204F

   2. Software tools:

       - ON Semi GUI configuration tool

       - Arduino/STM32 HAL driver library