Using External Clock when Low Standby Current is Required for S6BP20xA Family – KBA222986

Version 4

    Version: **

     

    Translation - Japanese: S6BP20xAファミリで低スタンバイ電流が必要な場合の外部クロックの使用 –  KBA222986 - Community Translated (JA)

     

    Question:

    How do I use external clock when low standby current is required for the S6BP20xA family?

     

    Answer:

    To use external clock with the S6BP20xA family:

    1. Choose a part number (MPN) for the S6BP20xA family with SYNC_IN function (See Product Lineup in the device datasheet).
    2. Connect MODE pin to GND.
    3. Set the SYNC pin to L in the system standby condition, and feed external clock signal to the SYNC pin after the system wakes up. PMIC will now operate in automatic PWM/PFM mode with internal clock to reduce quiescent current in system standby, and in fixed PWM mode with external clock signal during system wake-up.

     

    To ensure normal operation when using external clock, the internal clock frequency set by RT pin resistor (RRT) must be lower than the minimum of the external clock frequency (Fex_min) applied. Choose a RRT value using the following equation:

    RRT >

    1.1

    Fex_min × 21.7×10−12