@license MIT License More...

#include <stdint.h>

Include dependency graph for BQ25896Regs.hpp:

This graph shows which files directly or indirectly include this file:

Namespaces
namespace	BQ25896Regs

Detailed Description

@license MIT License

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 PMIC Register Definitions and Constants

This header file contains all register addresses, bit masks, shift values, and configuration constants for the TI BQ25896 PMIC (Power Management IC).

Overview

The BQ25896 is a high-efficiency switch-mode charger with:

Buck charger (up to 3A fast charge)
USB BC1.2 and HVDCP detection support
Integrated 10-bit ADC for voltage/current monitoring
OTG (On-The-Go) boost mode for power bank functionality
JEITA battery temperature protection

Register

REG00 (0x00): Input source control - HIZ mode, input current limit
REG01 (0x01): VINDPM control - Battery HOT/COLD threshold
REG02 (0x02): Power on/off control - ADC conv, boost freq, ICO
REG03 (0x03): Charge control - Bat load, OTG, charge enable, sys min
REG04 (0x04): Fast charge current control (0-3008mA, 64mA steps)
REG05 (0x05): Pre-charge/termination current
REG06 (0x06): Charge voltage control (3840-4608mV, 16mV steps)
REG07 (0x07): Charge timer and watchdog
REG08 (0x08): IR compensation and thermal regulation
REG09 (0x09): Misc control - BATFET, pumpEX
REG0A (0x0A): Boost control - boost voltage/current limit
REG0B (0x0B): Status register - bus/charge state, power good
REG0C (0x0C): Fault register - watchdog, boost, charge, bat, NTC faults
REG0D (0x0D): VINDPM voltage setting
REG0E (0x0E): ADC - Battery voltage (2304-4844mV, 20mV steps)
REG0F (0x0F): ADC - System voltage (2304-4844mV, 20mV steps)
REG10 (0x10): ADC - NTC temperature (21%-80%, percentage, NOT temperature)
REG11 (0x11): ADC - VBUS voltage (2600-15300mV, 100mV steps)
REG12 (0x12): ADC - Charge current (0-6350mA, 50mA steps)
REG13 (0x13): Input current limit status
REG14 (0x14): Device revision and configuration

Channels

VBAT (REG0E): 2304-4844mV, step 20mV - Battery voltage
VSYS (REG0F): 2304-4844mV, step 20mV - System voltage
VBUS (REG11): 2600-15300mV, step 100mV - USB input voltage
ICHG (REG12): 0-6350mA, step 50mA - Charge current (ADC readout)
NTC (REG10): 21%-80.055%, step 0.465% - NTC thermistor percentage
Note
This is NOT temperature! It's the NTC voltage as percentage of REGN. To convert to actual temperature, you need the NTC's Beta value and the pull-up resistor configuration, which varies by battery pack manufacturer. Typical conversion: ~50% ≈ 25°C, but depends on NTC specification.

Parameters

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

Mode Parameters

Boost voltage: 4550-5510mV (64mV steps)
Boost current limit: 0.5A, 0.75A, 1.2A, 1.4A, 1.65A, 1.875A, 2.15A

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

See also: BQ25896Charger.cpp, BQ25896Power.cpp, BQ25896Adc.cpp, BQ25896Core.cpp; BQ25896RegisterMap.md for detailed register descriptions