Overview
The STC3115IJT, produced by STMicroelectronics, is a gas gauge IC designed for battery monitoring in handheld applications. It utilizes current sensing, Coulomb counting, and accurate battery voltage measurements to estimate the state-of-charge (SOC) of the battery. The IC includes an internal temperature sensor for temperature compensation and features an alarm output that signals low SOC conditions or low battery voltage. The alarm threshold levels are programmable, enhancing the flexibility of the device.
The STC3115IJT is optimized for low power consumption, operating at 45 μA in power-saving mode and 2 μA in standby mode. It is available in micro-sized packages, including a 1.4 x 2.0 mm 10-bump CSP package and a 2.0 x 3.0 mm DFN10 package, making it suitable for compact designs.
Key Specifications
| Parameter | Min. | Typ. | Max. | Units |
|---|---|---|---|---|
| Operating Temperature | -20 | 70 | °C | |
| Battery Voltage Range | 0 | 4.5 | V | |
| Battery Voltage Measurement Accuracy | ±0.25% | % | ||
| Internal Temperature Sensor Accuracy | -3 | 3 | °C | |
| Power Consumption (Power-saving mode) | 45 | μA | ||
| Power Consumption (Standby mode) | 2 | μA | ||
| Package Dimensions (CSP) | 1.4 x 2.0 mm | mm | ||
| Package Dimensions (DFN10) | 2.0 x 3.0 mm | mm |
Key Features
- OptimGauge™ algorithm for accurate SOC estimation
- 0.25% accuracy battery voltage monitoring
- Coulomb counter and voltage-mode gas gauge operations
- Robust initial open-circuit-voltage (OCV) measurement at power-up
- Programmable low battery alarm
- Internal temperature sensor for temperature compensation
- Battery swap detection
- Low power consumption: 45 μA in power-saving mode, 2 μA max. in standby mode
- Micro-sized packages: 1.4 x 2.0 mm 10-bump CSP and 2.0 x 3.0 mm DFN10
Applications
- Mobile phones
- Multimedia players
- Digital cameras
- Portable medical equipment
Q & A
- What is the primary function of the STC3115IJT?
The primary function of the STC3115IJT is to monitor the state-of-charge (SOC) of a battery using current sensing, Coulomb counting, and accurate battery voltage measurements.
- What is the accuracy of the battery voltage measurement?
The battery voltage measurement accuracy is ±0.25%.
- What is the operating temperature range of the STC3115IJT?
The operating temperature range is -20°C to 70°C.
- What are the power consumption modes of the STC3115IJT?
The STC3115IJT operates at 45 μA in power-saving mode and 2 μA in standby mode.
- What types of packages are available for the STC3115IJT?
The STC3115IJT is available in 1.4 x 2.0 mm 10-bump CSP and 2.0 x 3.0 mm DFN10 packages.
- Does the STC3115IJT have an internal temperature sensor?
- Can the alarm threshold levels be programmed?
- What is the purpose of the BATD/CD and RSTIO pins?
The BATD/CD pin senses the presence of the battery and controls the battery charger, while the RSTIO pin delays the platform startup during the initial OCV measurement.
- How does the STC3115IJT handle battery swap detection?
The STC3115IJT detects battery swaps and restarts when the BATD/CD level returns below the threshold.
- What is the communication interface used by the STC3115IJT?
The STC3115IJT uses an I²C interface for communication, supporting up to 400 Kbit/s (fast mode).
