A library for communicating with the LTC2959 Ultra-Low Power Battery Gas Gauge
A lightweight and user-friendly Arduino library for interfacing with the LTC2959, a versatile power monitor and Coulomb counter IC by Analog Devices.
The LTC2959 library allows Arduino and compatible boards to communicate with the LTC2959 over I2C. It supports:
- Voltage monitoring (up to 62.6 V)
- Current monitoring (via sense resistor)
- Temperature monitoring (internal sensor)
- Charge accumulation (mAh)
- Min/Max tracking for voltage and current
- Coulomb counter enable/disable
- Manual charge counter reset
This library abstracts low-level register access and handles scaling, conversions, and two’s complement math for you.
- ✅ Read voltage, current, temperature, and accumulated charge
- ✅ Enable/disable Coulomb counter with optional deadband
- ✅ Reset charge counter manually
- ✅ Read max/min voltage and current
- ✅ Overwrite min current value (for testing)
- ⚙️ Easy to integrate into any project
- Download or clone this repository.
- Copy the folder to your Arduino libraries directory:
- Restart the Arduino IDE.
Search for the LTC2959 library in the Arduino Library Manager
| Function | Return Type | Description |
|---|---|---|
begin() |
bool |
Initializes I2C and checks if the LTC2959 is present. Returns true if successful. |
readVoltage() |
float |
Reads the supply/battery voltage (in volts). |
readCurrent() |
float |
Reads the instantaneous current (in amps). |
readTemperature() |
float |
Reads internal temperature of the chip (in °C). |
readCharge_mAh() |
float |
Reads accumulated charge since last reset (in mAh). |
enableCounter(Deadband deadband) |
bool |
Enables the Coulomb counter with a chosen deadband setting. |
disableCounter() |
bool |
Disables the Coulomb counter. |
resetChargeCounter() |
void |
Resets the charge accumulator (ACR) to 0. |
readMaxVoltage() |
float |
Reads the highest recorded voltage since power-up. |
readMinVoltage() |
float |
Reads the lowest recorded voltage since power-up. |
readMaxCurrent() |
float |
Reads the highest recorded current since power-up. |
readMinCurrent() |
float |
Reads the lowest recorded current since power-up. |
- Arduino-compatible board (e.g., Uno, Mega, ESP32, STM32)
- LTC2959 IC or breakout board
- I2C connection (usually
Wire.begin()is sufficient) - External RSENSE resistor (default assumed 0.250 Ω)
- Arduino IDE 1.8+ or Arduino CLI
Pius Onyema Ndukwu
Electrical & Electronics Engineer | Embedded Systems Developer
📧 Email: [email protected]