Adafruit MAX17048 LiPoly / LiIon Fuel Gauge and Battery Monitor
I2C fuel-gauge breakout based on the MAX17048. Reports LiPoly/LiIon cell voltage and percentage state-of-charge using ModelGauge estimation without an external sense resistor.
I2C fuel-gauge breakout based on the MAX17048. Reports LiPoly/LiIon cell voltage and percentage state-of-charge using ModelGauge estimation without an external sense resistor.
Board power input, use the same voltage as the microcontroller logic level.
Output from the battery input voltage.
Common ground for power and logic.
I2C clock line.
I2C data line. Adafruit Learn labels the board pin SDI and says it connects to microcontroller SDA.
Interrupt output, can pull low when configured voltage or percentage thresholds are crossed.
Quick-start hardware input for resetting the MAX17048.
Two JST-SH 4-pin I2C connectors for STEMMA QT/Qwiic cabling and chaining.
Two equivalent JST-PH battery ports. Connect battery to either one and load/charger to the other; observe polarity.
| Pin | Type | Function | Voltage |
|---|---|---|---|
| VIN | Power | Board power input, use the same voltage as the microcontroller logic level. | 3V to 5VDC |
| BAT | Power | Output from the battery input voltage. | 1S LiIon/LiPoly battery voltage, typically 3.7V to 4.2V |
| GND | Ground | Common ground for power and logic. | 0V |
| SCL | I2C | I2C clock line. | VIN logic level, 10K pullup on board |
| SDA | I2C | I2C data line. Adafruit Learn labels the board pin SDI and says it connects to microcontroller SDA. | VIN logic level, 10K pullup on board |
| INT | GPIO | Interrupt output, can pull low when configured voltage or percentage thresholds are crossed. | VIN logic level, pulled up to VIN with 10K |
| QSTART | GPIO | Quick-start hardware input for resetting the MAX17048. | VIN logic level |
| STEMMA QTQwiic | Unknown | Two JST-SH 4-pin I2C connectors for STEMMA QT/Qwiic cabling and chaining. | VIN, GND, SCL, SDA |
| JST-PH BATTERY PORTS | Unknown | Two equivalent JST-PH battery ports. Connect battery to either one and load/charger to the other; observe polarity. | 1S LiIon/LiPoly battery voltage |
Board power input, use the same voltage as the microcontroller logic level.
Output from the battery input voltage.
Common ground for power and logic.
I2C clock line.
I2C data line. Adafruit Learn labels the board pin SDI and says it connects to microcontroller SDA.
Interrupt output, can pull low when configured voltage or percentage thresholds are crossed.
Quick-start hardware input for resetting the MAX17048.
Two JST-SH 4-pin I2C connectors for STEMMA QT/Qwiic cabling and chaining.
Two equivalent JST-PH battery ports. Connect battery to either one and load/charger to the other; observe polarity.
I2C · USB · 5 V · Module
Confirm the data interface matches your host board.
Module pins: VIN, GND, SCL, SDA. Schematik maps them to your board in the app.
Single-cell LiPo chargers (TP4056, MicroUSB/Type-C modules), charger/booster combos (PowerBoost 500/1000, Lipo Rider Plus 5V/2.4A), I2C fuel gauges (MAX17048, LC709203F) and Qi wireless charging coils.
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