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

2.3 Processor Hot Indication

PROCHOT is an active low open-drain output to support Intel IMVP protocols. It continues to monitor input current, battery discharge current, and system voltage. If any event in the PROCHOT profile is triggered, a pulse is asserted to the CPU so that the CPU adjusts its performance to the power available to the system.

The events monitored by the processor hot function are listed in Table 2-1. For more PROCHOT event details, see the BQ25720 SMBus 1- to 4-Cell Narrow VDC Buck-Boost Battery Charge Controller With System Power Monitor and Processor Hot Monitor Data Sheet.

Table 2-1 Processor Hot Function
Function Description
ICRIT 110% of Ilim2, adapter peak current. The deglitch time could change from 15 µs to 800 µs.
INOM Adapter average current, as 110% of IIN_DPM
IDCHG1 Battery discharge current level 1
IDCHG2 Battery discharge current level 2, IDCHG2 > IDCHG1
VBUS_VAP VBUS threshold to trigger PROCHOT in VAP mode 2 and 3
VSYS System voltage. The deglitch time is 4 µs.
Battery Removal To detect battery be removed
CMPOUT Independent comparator output (CMPOUT pin HIGH to LOW)
VINDPM VBUS lower than 83%/91%/100% of VINDPM setting. For more details, see the device-specific data sheet.
EXIT_VAP Charger exits VAP mode.