Описание
The Texas Instruments bq27742 is a fuel gauge for single-cell Li-ion battery packs that uses patented Impedance Track technology to deliver rate-, temperature-, and aging-compensated predictions of remaining battery capacity and system runtime with highest accuracy. The device also includes a fully integrated high-side protector that eliminates the need for a separate Li-ion protection circuit and provides a full suite of high-accuracy fault detections for overvoltage, undervoltage, overcurrent in charge, overcurrent in discharge, and short-circuit in discharge conditions. The hardware protection functions offer built-in data flash-based programmability, allowing simple reconfiguration of existing devices for varying end equipment needs.The fuel gauge provides information such as remaining battery capacity (mAh), state-of-charge (%), runtime to empty (minutes), voltage (mV), current (mA), and temperature (°C), as well as recording vital parameters throughout the lifetime of the battery. The device also supports interrupts to the host to indicate detection of a variety of important battery conditions to the system.The CSP is a 15-ball package (2.78 mm x 1.96 mm) that is ideal for space-constrained applications.
- Battery Fuel Gauge and Protector for 1-Series Li-ion Applications
- Microcontroller Peripheral Provides:
- Precision 16-bit, High-side Coulomb Counter with Low-value Sense Resistor (5 mO to 20 mO)
- External and Internal Temperature Sensors for Battery Temperature Reporting
- Lifetime and Current Data Logging
- 64 Bytes of Non-volatile Scratch Pad Flash
- SHA-1 Authentication Capability
- Battery Fuel Gauging Based on Patented Impedance Track™ Technology
- Models Battery Discharge Curve for Accurate Time-To-Empty Predictions
- Automatically Adjusts for Aging, Self-Discharge, and Temperature- and Rate-induced Effects on Battery
- Integrated High-side NMOS Protection FET Drive
- Hardware-based Safety and Protection:
- Overvoltage (OVP)
- Undervoltage (UVP)
- Overcurrent in Charge (OCC)
- Overcurrent in Discharge (OCD)
- Short-Circuit in Discharge (SCD)
- I2C Format for Communication With Host System
- Ultra-compact, 15-ball NanoFree Chip-scale Package (CSP)
