SLUAA94 December   2020 BQ24190 , BQ24195 , BQ24195L , BQ24295 , BQ24297 , BQ25600D , BQ25601D , BQ25606 , BQ25611D , BQ25616 , BQ25890 , BQ25890H , BQ25895 , BQ25898D

 

  1.   Trademarks
  2. 1 USB Battery Charging Specification 1.2 (BC1.2)
  3. 2 HVDCP, USB Type-C, and USB PD
  4. 3 Input Current Limit Detection Capability Comparison
  5. 4 BQ24190, BQ24195, and BQ24195L
  6. 5 BQ24295
  7. 6 BQ24297
  8. 7 BQ25890 and BQ25895
  9. 8 BQ25890H and BQ25898D
  10. 9 BQ25601D, BQ25600D, and BQ25611D
  11. 10BQ25606 and BQ25616
  12. 11Summary
  13. 12References

1 USB Battery Charging Specification 1.2 (BC1.2)

The USB Battery Charging Specification 1.2 (BC1.2) specification defines the mechanisms to permit USB devices to draw current higher than standard USB current such 500 mA for USB2.0, 900 mA for USB3.0. Through the mechanism defined in the BC1.2 spec, devices can draw up to 1.5 A of current. The detection and the advertisement of the higher current capable ports are done through USB2.0 D+ and D- lines upon connection. There are three charging ports defined in the BC1.2 spec:

  • Dedicated Charging Port (DCP)
  • Charging Downstream Port (CDP)
  • Standard Downstream Port (SDP)

Table 1-1 shows the most common USB 1.2 port types.

Table 1-1 USB BC1.2 Port Types
Port Definition Examples Output Current
SDP (Standard Downstream Port) Laptop USB port 5 V at 100mA (USB 2.0)
5 V at 500 mA (USB2.0)
5 V at 900 mA (USB3.0)
DCP (Dedicated Charging Port) USB Wall adapter 5 V at 500 mA to 1.5 A
CDP (Charging Downstream Port) Audio Docking Station 5 V at 900 mA to 1.5 A