SLVAFV8 July   2024 TPS25751

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Introduction
  5. 2 ADCINX Setting
  6. 3 Unique Address Interface Protocol
  7. 4 PTCH Mode to APP Mode
    1. 4.1 Step of PTCH Mode to APP Mode
    2. 4.2 Step of Generating Low Region Binary
  8. 5 Dead Battery Configurations
  9. 6 Interrupt Event, Mask, Clear for I2Ct IRQ
  10. 7 GPIOx Function
  11. 8 4CC Command
  12. 9 Summary
  13. 10References

5 Dead Battery Configurations

Dead battery mode entering rule is that TPS25751 only has power from the VBUS which means that the TPS25751 can be turned on by the VBUS pin in this mode. And the mode register (Offset = 3h) can show the BOOT indicating that the PD controller is booting in dead battery. When using EC with TPS25751, set dead battery configuration as AlwaysEnableSink or NegotiateHighVoltage is recommended.

If system wants to take the TPS25751 out of the dead battery mode after there is VIN_3V3 and PP5V on TPS25751D, write over I2C to clear the PD‘s dead battery flag by using 4CC DBfg command to let TPS25751D rely on VIN_3V3 and PP5V instead of VBUS. After clearing dead battery flag, PD can get power from VIN_3V3. PD can now be able to source power from PP5V, but cannot change the active PD contract on the port. PD cannot automatically swap to source power role unless commanded to do so.

If TPS25751 has VIN_3V3 and PP5V first, the TPS25751 does not enter in dead battery mode and does not need to clear the dead battery flag.