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Frequent questions

  • [FAQ] BQ25120A: What are the differences between the BQ25120 and the BQ25120A?

    Part Number: BQ25120A Other Parts Discussed in Thread: BQ25120 , The BQ25120A is the new revision of the BQ25120 (not recommend for new designs). They are pin-to-pin and software compatible, but the BQ25120A has added improvements such as: Added quick…

  • [FAQ] BQ25120A: Can I use the BQ25120A as a standalone device without an I2C controller?

    Part Number: BQ25120A Yes, you can configure the BQ25120A as a standalone device by configuring the current limit, fast charge current and termination current. To do so you will need to select the appropriate resistors for the ILIM, ISET and IPRETERM…

  • [FAQ] BQ25120A: Can I update the default I2C options?

    Part Number: BQ25120A Other Parts Discussed in Thread: BQ25125 , BQ25123 , BQ25122 , , BQ25121A , BQ25120F3A You cannot modify the default options of the device. After powering up or waking out of shipmode all registers will be set to default values.…

  • [FAQ] BQ25120A: What are the device choices? The BQ25120A, BQ25121A, BQ25122, BQ25123, BQ25125, etc., look very similar?

    Part Number: BQ25120A Other Parts Discussed in Thread: BQ25125 , BQ25123 , BQ25121A , BQ25122 , BQ25120F3A The devices BQ25120A, BQ25121A, BQ25122, BQ25123, BQ25125, etc., are all part of the same family of battery chargers: BQ25120x. They function…

  • [FAQ] BQ25120A: Can I drive the /MR pin externally through a GPIO?

    Part Number: BQ25120A Other Parts Discussed in Thread: BQ21061 The Manual Reset Input (/MR) is pulled up internally to BAT. To drive the signal with a microcontroller (MCU) you can use a N-Channel mosfet (nMOS) to mimic a "press" action from the MCU.…

  • [FAQ] BQ25120A: What is the purpose of the watchdog timer? Can I disable the watchdog timer?

    Part Number: BQ25120A Other Parts Discussed in Thread: BQ25121A , BQ25120F3A In microcontroller applications, the watchdog timer is use to assure the host is still responsive and have not stopped operating. The BQ25120A has a 50-s watchdog timer that…

  • [FAQ] BQ25120A: What is the purpose of the /CD pin? Do I need to connect it to my MCU?

    Part Number: BQ25120A On the BQ25120A the chip disable (/CD) input pin is used to disable the device and has dual functionality based on if the adapter (VIN) is present. Battery Only Mode: When operating on battery only mode the /CD pin is used to…

  • [FAQ] BQ25120A: What is shipmode and why do I need it?

    Part Number: BQ25120A Shipmode is the state of the device where is in the lowest power consumption. After manufacturing, the product will be on storage for a long time before reaching the consumers hands. Nowadays, we want to use the device out of the…

  • [FAQ] BQ25120A: How do I enter and exit ship-mode?

    Part Number: BQ25120A The charger can enter shipmode by: To enter shipmode on the BQ25120A, the device should be operating on battery-only mode (V IN < V UVLO ), and /CD and /MR must be high. Then you can: Send the I2C command EN_SHIPMODE = 1…

  • [FAQ] TPS549D22: What to do with the PMBus pins when the PMBus interface is not used

    Part Number: TPS549D22 Other Parts Discussed in Thread: TPS548B22 , TPS548D22 Depending on the available supply, customers may ask if they can use PMBus parts such as the TPS549D22 or TPS549D22 in place of their pin-to-pin counterparts that lack a PMBus…

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