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Frequent questions

  • [FAQ] How long does the voltage on the PACK pin need to be applied to wake-up the gauge?

    To wake-up the gauge from shutdown, a voltage above the VSTARTUP needs to be applied to the PACK pin for a minimum time of 30ms to wake-up the hardware. After the hardware is awake it can take up to 2 seconds for the firmware to initialize and calculate…

  • [FAQ] How to enter UNSEAL or FULL ACCESS modes after sealing the gauge?

    TI battery gauges use the security modes SEAL/UNSEAL/FULL ACCESS in order to help protect the flash memory of the gauge from third parties reading the gauge’s configuration memory. This prevents any copying of the gauge or BMS system. The mode information…

  • [FAQ] Why does Valid Charge Termination (VCT) take less or more than 80 seconds to trigger?

    Impedance Track battery gauges use VCT to help determine the full charge of a battery. VCT is used to help determine the range we report for Relative State of Charge (RSoC). The gauge will learn the Depth of Discharge at End of Charge (DoD at EoC) when…

  • [FAQ] BQ40Z50 FAQs

    Other Parts Discussed in Thread: BQ40Z50-R1 , BQ40Z50 , BQ40Z50-R2 BQ40Z50 FAQ Home Page This is the home page for common questions in relation to the BQ40Z50, BQ40Z50-R1, BQ40Z50-R2, BQ40Z50-R3, BQ40Z50-R4, and BQ40Z50-R5. FAQs Related FAQ home…

  • [FAQ] UCC27282: Calculating Component and System Values for Designs Using Half Bridge Drivers

    Part Number: UCC27282 In order to aid in half bridge system design, the attached excel calculator has 3 sections for calculating bootstrap component values, driver power dissipation, and FET switching times. The bootstrap system is vital as it provides…

  • [FAQ] UCC27614: Gate Driver Peak Current Considerations

    Part Number: UCC27614 Other Parts Discussed in Thread: CSD19535KTT , Does the gate driver self-limit output current? The output current is limited by the output stage of the driver, FET internal resistance and any added gate resistors, as described by…

  • [FAQ] BQ76952: Accumulated charge returns -32768

    Part Number: BQ76952 Other Parts Discussed in Thread: BQSTUDIO Hello everyone, Before discharging I had set accumulated charge value back to 0, then I have sent ALL_FETS_ON command from Bqstudio. Suddenly read accumulated charge value was changed…

  • [FAQ] TPS65086x: TPS650861, TPS6508641: Buck Controller External Feedback Set-Up

    Part Number: TPS650861 This thread applies to the TPS65086x devices, and specifically to the TPS650861 and TPS6508641 devices with regard to BUCK1. The TPS650861 PMIC has three Buck controllers: BUCK1, BUCK2, and BUCK6. Each controller has an external…

  • [FAQ] LP8732-Q1: PGOOD Triggers when output voltage is adjusted

    Part Number: LP8732-Q1 This FAQ applies to LP8732x, LP8733x, LP8732x-Q1, LP8733x-Q1. In LP873x-Q1 devices the PGOOD triggers always when output voltage is adjusted through I2C command no matter how small voltage step is applied. To overcome this and…

  • [FAQ] LP87561-Q1: PGOOD triggers when output voltage is adjusted

    Part Number: LP87561-Q1 This FAQ applies to LP8756x-Q1, LP8752x-Q1. In LP875x-Q1 devices the PGOOD triggers always when output voltage is adjusted through I2C command no matter how small voltage step is applied. To overcome this and avoid SoC reset…

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