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

Mixed Isolation Circuits using bq79600-Q1

When using the bq79600-Q1 device as the communication bridge in combination with any variant of the bq79616-Q1 device as the stack device, it is important to validate the robustness of the isolation interface between the base and first stack device. This process is because the devices are designed to support a mixed isolation type on the COMH side of the base vs. the COML of the stack device. Typically this means that the bq79600-Q1 will have a transformer from the previous list, and then the user may select any of the three supported isolation types for the bq79616-Q1 stack device side (that is the same transformer part number on both sides if transformer isolation is desired). Every scenario with different transformer, cap, and choke part numbers mixed has not been tested so it is important for the user to ensure that the signal integrity is maintained after choosing their isolation components. Schematically, the key difference is that the decoupling capacitors on the bq79600-Q1 circuit are 100pF compared to 220pF for the bq79616-Q1 device.

GUID-20200826-CA0I-2M4B-DZVQ-74GPRZDCLF94-low.gif Figure 6-1 Example: BQ79600-Q1 Connected to BQ79616-Q1 Timing
GUID-20200826-CA0I-VJGB-X1DN-ZK1FQMLJ9VL0-low.gif Figure 6-2 How a Stack Command is Sent
GUID-20200826-CA0I-FMG2-N0BZ-617SDXBH2QNC-low.gif Figure 6-3 When Does Each Device Receive the Command?
GUID-20200826-CA0I-5RCV-RBNS-VZV5WVGCZGKN-low.gif Figure 6-4 Sequence of Device Receiving or Sending Commands