Overview
The Texas Instruments BQ27425YZFR-G1 is a system-side Impedance Track™ fuel gauge designed for single-cell LiCoO2 battery packs. This microcontroller peripheral provides accurate battery fuel gauging with minimal user configuration and system microcontroller firmware development. The device utilizes Texas Instruments' proprietary Impedance Track™ algorithm, which models the battery discharge curve to predict the state-of-charge (SOC) with high accuracy across various operating conditions and over the battery's lifetime.
The BQ27425YZFR-G1 integrates a low-value sense resistor (10 mΩ typical) and a coulomb counter, allowing it to measure charge/discharge activity and cell impedance. It also includes an internal temperature sensor for estimating cell temperature. The device can be powered directly from the battery pack and communicates with the system microcontroller via an I2C interface.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Regulator Input Range | -0.3 to 5.5 | V |
| Supply Voltage Range | -0.3 to 2.75 | V |
| Open-Drain I/O Pins (SDA, SCL) | -0.3 to 5.5 | V |
| BAT Input Pin | -0.3 to 5.5 | V |
| Operating Free-Air Temperature Range | -40 to 85 | °C |
| Storage Temperature Range | -65 to 150 | °C |
| Integrated Sense Resistor | 10 mΩ (typical) | mΩ |
| Package Type | 15-pin 2.69 × 1.75 mm, 0.5 mm pitch CSP |
Key Features
- Accurate battery fuel gauging using Texas Instruments' proprietary Impedance Track™ algorithm.
- Models battery discharge curve for accurate state-of-charge report.
- Automatically adjusts for battery aging, self-discharge, and temperature/rate inefficiencies.
- Integrated low-value sense resistor (10 mΩ typical) and coulomb counter.
- Internal temperature sensor for battery temperature reporting.
- Configurable level of state-of-charge (SOC) interrupts.
- I2C interface for connection to system microcontroller port.
- Small 15-pin 2.69 × 1.75 mm, 0.5 mm pitch CSP package ideal for space-constrained applications.
- Microcontroller peripheral provides remaining battery capacity (mAh), state-of-charge (%), and battery voltage (mV).
- Works with embedded or removable battery packs.
Applications
- Battery fuel gauge for 1-series LiCoO2 batteries.
- Feature phones.
- Smart phones.
- PDAs.
- Digital still and video cameras.
- Handheld terminals.
- MP3 or multimedia players.
Q & A
- What is the primary function of the BQ27425YZFR-G1?
The primary function of the BQ27425YZFR-G1 is to provide accurate battery fuel gauging for single-cell LiCoO2 battery packs using Texas Instruments' proprietary Impedance Track™ algorithm.
- What is the Impedance Track™ algorithm?
The Impedance Track™ algorithm models the battery discharge curve to predict the state-of-charge (SOC) with high accuracy across various operating conditions and over the battery's lifetime.
- What is the typical value of the integrated sense resistor?
The typical value of the integrated sense resistor is 10 mΩ.
- How does the device communicate with the system microcontroller?
The device communicates with the system microcontroller via an I2C interface.
- What is the operating temperature range of the BQ27425YZFR-G1?
The operating free-air temperature range is -40°C to 85°C.
- What types of battery packs does the BQ27425YZFR-G1 support?
The BQ27425YZFR-G1 supports both embedded and removable battery packs.
- What are some common applications of the BQ27425YZFR-G1?
Common applications include feature phones, smart phones, PDAs, digital still and video cameras, handheld terminals, and MP3 or multimedia players.
- How does the device adjust for battery aging and self-discharge?
The device automatically adjusts for battery aging, self-discharge, and temperature/rate inefficiencies using the Impedance Track™ algorithm.
- What is the package type of the BQ27425YZFR-G1?
The package type is a 15-pin 2.69 × 1.75 mm, 0.5 mm pitch CSP package.
- Does the BQ27425YZFR-G1 have an internal temperature sensor?
Yes, the device includes an internal temperature sensor for estimating cell temperature.
