Overview
The STC3115IQT, produced by STMicroelectronics, is a gas gauge IC designed for battery monitoring in handheld applications. It utilizes current sensing, Coulomb counting, and accurate measurements of the battery voltage to estimate the state-of-charge (SOC) of the battery. The IC includes an internal temperature sensor to simplify temperature compensation and features an alarm output that signals low SOC conditions or low battery voltage, with programmable alarm threshold levels.
The STC3115IQT is optimized for low-cost and high-performance gas gauging, making it suitable for a variety of portable devices. It operates in two modes: mixed mode with continuous current measurement and voltage mode with power-saving features, allowing for flexibility in balancing accuracy and power consumption.
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 | 0.25 | % | |
| Internal Temperature Sensor Accuracy | -3 | 3 | °C | |
| Power Consumption (Power-saving mode) | 45 | μA | ||
| Power Consumption (Standby mode) | 2 | μA | ||
| Package Dimensions | 1.4 x 2.0 mm (CSP), 2.0 x 3.0 mm (DFN10) | mm |
Key Features
- OptimGauge™ algorithm for accurate state-of-charge 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 CSP and 2.0 x 3.0 mm DFN10
Applications
- Mobile phones
- Multimedia players
- Digital cameras
- Portable medical equipment
- Wearable devices
Q & A
- What is the primary function of the STC3115IQT?
The primary function of the STC3115IQT is to estimate the state-of-charge (SOC) of a battery using current sensing, Coulomb counting, and accurate measurements of the battery voltage.
- What are the operating modes of the STC3115IQT?
The STC3115IQT operates in two modes: mixed mode with continuous current measurement and voltage mode with power-saving features.
- What is the accuracy of the battery voltage measurement?
The battery voltage measurement accuracy is ±0.25% over the specified temperature range.
- How does the internal temperature sensor contribute to the IC's functionality?
The internal temperature sensor simplifies the implementation of temperature compensation, ensuring accurate SOC estimation across various temperatures.
- What is the purpose of the alarm output?
The alarm output signals low SOC conditions or low battery voltage, with programmable alarm threshold levels.
- What are the package options for the STC3115IQT?
The STC3115IQT is available in 1.4 x 2.0 mm CSP and 2.0 x 3.0 mm DFN10 packages.
- How does the STC3115IQT manage power consumption?
The IC has a power-saving mode consuming 45 μA and a standby mode consuming 2 μA max.
- What is the role 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 platform startup during the initial OCV measurement.
- What types of devices typically use the STC3115IQT?
The STC3115IQT is typically used in mobile phones, multimedia players, digital cameras, and portable medical equipment.
- How does the OptimGauge™ algorithm enhance the IC's performance?
The OptimGauge™ algorithm ensures high accuracy in state-of-charge estimation under various application conditions.
