SLVAEP4 October   2023 BQ79600-Q1 , BQ79612-Q1 , BQ79614-Q1 , BQ79616 , BQ79616-Q1 , BQ79652-Q1 , BQ79654-Q1 , BQ79656-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Introduction
  5. 2 Receiver Topology and Common Mode Voltages
  6. 3 Signal Integrity Requirements
    1. 3.1 Receiver Timing Requirements
    2. 3.2 Receiver Threshold Requirements
  7. 4 Debug Fault Registers
  8. 5 Isolation Types
    1. 5.1 Transformer Isolation
    2. 5.2 Capacitor Only Isolation
    3. 5.3 Capacitor and Choke Isolation
  9. 6 Mixed Isolation Circuits using bq79600-Q1
  10. 7 Ring Architecture
  11. 8 Noise Immunity and Emissions
  12. 9 Daisy Chain Cable Selection
  13. 10References

5.2 Capacitor Only Isolation

For low noise environments or devices mounted on the same pcb, typically the best practice is to choose capacitors only for isolation. We recommend these capacitors to be 2.2nF, high voltage rated (twice the voltage of the system's total pack voltage), and automotive qualified. Our reference schematic uses the 1206J2K00222KXR supplied by Knowles. Use of a capacitor of up to 5.6nF for this isolation is possible.

GUID-84026FA5-D83D-4C8B-894A-8C33D92BD56C-low.gifFigure 5-2 Capacitors Only Across PCBs
GUID-2BF145E0-4EDA-4E30-A4AC-CF438549BEAA-low.gif Figure 5-3 Capacitor Only on Same PCB