BQ25896Charger.hpp File Reference

@license MIT License More...

#include "../../PmicChargerBase.hpp"
#include "BQ25896Core.hpp"

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Classes
class	BQ25896Charger

Detailed Description

@license MIT License

Copyright (c) 2026 lewis he

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Author

Lewis He (lewis.nosp@m.he@o.nosp@m.utloo.nosp@m.k.co.nosp@m.m)

Date

2026-04-09

BQ25896 Charger Control Interface

This class provides control over charging functions including:

• Enable/disable charging
• Pre-charge current setting (for weak battery recovery)
• Fast charge current setting (main charging phase)
• Termination current setting (charge done detection)
• Charge voltage setting (constant voltage phase)

Parameters

The BQ25896 follows a multi-phase charging algorithm:

1. Pre-charge: When battery voltage is below BATLOWV (default 3.0V), charger applies pre-charge current (default 128mA) to safely recover a deeply discharged battery.
2. Fast Charge (CC/CV): Once battery reaches BATLOWV threshold, constant current is applied (configurable 0-3008mA). When battery voltage reaches the set charge voltage, it switches to constant voltage mode to prevent overcharging.
3. Termination: When charge current drops below the termination threshold, charging is complete.

Quantization

Note

All setter methods will automatically quantize input values to the nearest valid step if they do not match exactly.

• Pre-charge current: 64mA steps (64-1024mA)
• Fast charge current: 64mA steps (0-3008mA, 0 disables charge)
• Termination current: 64mA steps (64-1024mA)
• Charge voltage: 16mV steps (3840-4608mV)

See also

BQ25896Charger.cpp for implementation

BQ25896Regs.hpp for register definitions and parameter ranges

BQ25896RegisterMap.md for detailed register descriptions

Definition in file BQ25896Charger.hpp.