STC3115IJT is Low-power single-cell Li-ion fuel gauge IC with I2C interface for wearables and miniature IoT devices

The STC3115IJT is a low-power battery gas gauge IC developed by STMicroelectronics for single-cell Li-ion and Li-polymer batteries, which accurately tracks battery state of charge without complex factory calibration.

• Dual Fuel Gauge Measurement Technology: Combines coulomb counter and voltage monitoring algorithms. The integrated sense amplifier captures charge and discharge current, while cell voltage sampling corrects accumulated coulomb counting errors to deliver precise SoC values.
• Low Power Consumption Design: Operating supply current is only several microamps, with a standby mode featuring nanoampere quiescent current to minimize power loss during system sleep, significantly extending battery standby time.
• Built-in Battery Parameter Storage: On-chip non-volatile memory stores battery characteristic parameters including rated capacity, aging coefficients, and temperature compensation data, retaining information after power-off.
• I2C Communication Interface: Standard I2C two-wire bus communicates with main MCU. The host can read real-time SoC, battery voltage, current, chip temperature, and modify configuration registers.
• Multiple Built-in Protection Detection: Monitors battery overvoltage, undervoltage, and abnormal current. Outputs flag bits to alert the MCU of battery risks, cooperating with external charger and load switches to implement battery safety control.
• Small Package Form Factor: Supplied in tiny SOT-23-5 package, occupying minimal PCB space, ideal for compact portable electronic products with limited layout area.

• Wearable consumer electronics: smart bands, smart watches, wireless Bluetooth earbuds, portable health monitors
• Low-power IoT wireless equipment: BLE sensor nodes, asset tracking tags, miniature environmental sensors
• Handheld portable devices: wireless remote controllers, portable Bluetooth speakers, digital hearing aids
• Miniature medical devices: portable blood glucose meters, wearable pulse oximeters
• Small single-cell lithium battery packs for compact handheld consumer gadgets