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MAX17043 LiPo Fuel Gauge Module — I²C, Single-Cell Li-ion SOC, Arduino
MAX17043 LiPo Fuel Gauge Module I²C, Single-Cell Li-ion SOC, Arduino
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MAX17043 LiPo Fuel Gauge Module — I²C, Single-Cell Li-ion State-of-Charge
The MAX17043 fuel gauge module uses Maxim's ModelGauge algorithm to accurately measure the state-of-charge (SOC) of a single-cell Li-ion or LiPo battery — reporting remaining capacity as a percentage (0–100%) via I²C without requiring a sense resistor. Unlike simple voltage-based battery monitors, the MAX17043 compensates for battery aging, temperature, and discharge rate to provide accurate SOC even under varying load conditions. Includes schematic, Eagle files, datasheet, and example code.
Module Specifications
- IC: MAX17043G+U (Maxim Integrated)
- Interface: I²C (address: 0x36)
- Battery: Single-cell Li-ion / LiPo (3.7V nominal)
- SOC Output: 0–100% (1% resolution)
- Voltage Measurement: 2.5–5V range, 1.25mV resolution
- Algorithm: ModelGauge (no sense resistor needed)
- Alert: Programmable low-battery alert threshold
- Reset: Hardware and software reset
- Supply Voltage: 3.0V – 4.5V (battery powered)
- Quiescent Current: 23μA (active) / 3μA (hibernate)
MAX17043 vs Voltage Divider Battery Monitor
- MAX17043 (this module): ModelGauge SOC algorithm, accurate % under load, compensates for aging — for accurate battery level display
- Voltage divider + ADC: Simple voltage reading, inaccurate under load, no aging compensation — for rough battery level indication only
Arduino Wiring
- VCC → 3.3V | GND → GND | SDA → A4 | SCL → A5
- CELL+ and CELL- connect to battery terminals
- Use SparkFun MAX17043 library from Arduino Library Manager
Typical Applications
- IoT device battery level display
- Wearable device battery percentage indicator
- Drone LiPo battery monitor
- Portable Arduino project battery gauge
- Low-battery alert system
MAX17043 LiPo fuel gauge module — I²C, ModelGauge SOC, 23μA active current for accurate Li-ion battery level monitoring in IoT and portable Arduino projects.
