SLUAAG7 October   2021 BQ25720

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Type-C Power Delivery (PD) Connection
    2. 1.2 Type-C Battery Charging Topologies
    3. 1.3 BQ25720 Overview
  3. 2Design Considerations for Notebook Applications
    1. 2.1 Vmin Active Protection (VAP)
    2. 2.2 Fast Role Swap (FRS)
    3. 2.3 Processor Hot Indication
    4. 2.4 Two-Level Battery Discharge Current Limit
    5. 2.5 Pass Through Mode (PTM) Operation
    6. 2.6 Seamless Mode Transition
    7. 2.7 Current and Power Monitor
    8. 2.8 Input Source Dynamic Power Management
    9. 2.9 Power Up USB Port From Battery (USB OTG)
  4. 3Test Results
  5. 4Summary
  6. 5References

2.7 Current and Power Monitor

Two different current sense amplifiers (CSA) monitor adapter current in forward charging, or reverse current in OTG mode (IADPT) and the battery charge/discharge current (IBAT), separately. One CSA amplifiers the input sensed voltage of ACP-ACN by 20x or 40x through the IADAPT pin. The other CSA amplifiers the input sensed voltage of SRP-SRN by 8x or 16x through the IBAT pin.

It is worth noting that current sense values are not limited to symmetrical both 5 mΩ or both 10 mΩ. For defined current sense resistors (10 mΩ/5 mΩ), PSYS function is still valid when RAC=10 mΩ and RSR=5 mΩ, vice versa.