SLUAA16A August   2020  – October 2023 BQ79600-Q1

 

  1.   1
  2.   BQ79600-Q1 Design Recommendations
  3.   Trademarks
  4. 1Circuit Design
    1. 1.1 Power Supply (BAT, CVDD, DVDD, VIO pins)
    2. 1.2 Inhibit Output (INH pin)
    3. 1.3 Communication to Host (MOSI/RX, MISO/TX, nCS, SCLK, nUART/SPI (SPI_RDY) pins)
    4. 1.4 Fault Output (NFAULT pin)
    5. 1.5 Communication to Battery Monitor Device (COMHP, COMHN, COMLP, COMLN pins)
  5. 2Layout Guidelines
    1. 2.1 Ground Planes
    2. 2.2 Bypass Capacitors for Power Supplies and References
    3. 2.3 UART/SPI Communication
    4. 2.4 Daisy Chain Communication
  6. 3Daisy Chain Signal Integrity
    1. 3.1 Daisy Chain Receiver Threshold
    2. 3.2 Common and Differential Mode Noise
    3. 3.3 BCI Performance
    4. 3.4 Radiated Emissions Performance
  7. 4Summary
  8. 5References
  9. 6Revision History

Abstract

BQ79600-Q1 is a communication bridge device used to interface between the host microcontroller and the battery monitor devices from the BQ7961X family. The device is capable of communicating through UART or through SPI interface to the host and translates the communication to a differential daisy chain protocol understood by BQ7961X family of devices.

The bidirectional daisy chain ports support transformer-based isolation. In ring architecture, this device supports automatic host wakeup or reverse wakeup which allows the host microcontroller and PMIC to be in low power mode (SHUTDOWN/SLEEP) while the BQ79600-Q1 monitors for faults coming from the stacked battery monitor devices and wakes up the microcontroller and PMIC if any unmasked fault is detected.