Overview
The Texas Instruments bq27541-V200 is a sophisticated single-cell Li-Ion battery fuel gauge designed to provide accurate and reliable battery state information. This device is a microcontroller peripheral that integrates Texas Instruments' proprietary Impedance Track™ algorithm, which ensures high-accuracy gas gauging predictions across various operating conditions and over the battery's lifetime. The bq27541-V200 is optimized for use in battery packs or on the system’s main board, offering features such as internal temperature sensing, secure battery pack authentication, and detailed battery health monitoring.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| VI Regulator input, REGIN | -0.3 | - | 24 | V |
| VCC Supply voltage range | -0.3 | - | 2.75 | V |
| VIOD Open-drain I/O pins (SDA, SCL, HDQ) | -0.3 | - | 6 | V |
| VBAT BAT input, (pin 4) | -0.3 | - | 6 | V |
| Functional temperature range | -40 | - | 100 | °C |
| Storage temperature range | -65 | - | 150 | °C |
| Power rating (12-pin DRZ package) | - | 482 mW | - | mW |
| ADC conversion time | 125 ms | - | - | ms |
| ADC resolution | 14 bits | 15 bits | - | bits |
Key Features
- Accurate Battery Fuel Gauging: Utilizes Texas Instruments' proprietary Impedance Track™ algorithm for high-accuracy state-of-charge predictions.
- Internal Temperature Sensor: Provides system temperature reporting and can be configured to use an external high-accuracy NTC thermistor.
- Secure Authentication: Supports SHA-1/HMAC authentication for secure battery pack authentication.
- Lifetime Data Logging: Offers 96 bytes of non-volatile scratch pad flash memory for logging battery health and usage data.
- Power Modes: Includes NORMAL, SLEEP, FULLSLEEP, HIBERNATE, and PRESHUTDOWN modes to minimize power consumption.
- Communication Interfaces: Supports HDQ and I2C™ interface formats for communication with the host system.
- Small Package: Available in a compact 12-pin, 2.5 mm × 4 mm SON package.
Applications
- Smartphones
- PDAs
- Digital Still and Video Cameras
- Handheld Terminals
- MP3 or Multimedia Players
Q & A
- What is the primary function of the bq27541-V200?
The primary function of the bq27541-V200 is to provide accurate battery fuel gauging for single-cell Li-Ion battery packs using Texas Instruments' proprietary Impedance Track™ algorithm.
- What communication interfaces does the bq27541-V200 support?
The bq27541-V200 supports HDQ and I2C™ interface formats for communication with the host system.
- How does the bq27541-V200 measure battery health?
The device measures battery health by monitoring the voltage across a small-value series sense resistor and using cell current, cell open-circuit voltage (OCV), and cell voltage under loading conditions to compute cell impedance.
- What is the purpose of the internal temperature sensor in the bq27541-V200?
The internal temperature sensor is used to monitor the battery-pack environment, which is essential for fuel gauging and cell protection functionality.
- What security feature does the bq27541-V200 include?
The bq27541-V200 includes SHA-1/HMAC authentication for secure battery pack authentication.
- What are the different power modes available in the bq27541-V200?
The device includes NORMAL, SLEEP, FULLSLEEP, HIBERNATE, and PRESHUTDOWN power modes to minimize power consumption.
- How much non-volatile flash memory does the bq27541-V200 provide?
The bq27541-V200 provides 96 bytes of non-volatile scratch pad flash memory, partitioned into three 32-byte blocks.
- What is the typical package size of the bq27541-V200?
The device is available in a compact 12-pin, 2.5 mm × 4 mm SON package.
- What are some common applications of the bq27541-V200?
Common applications include smartphones, PDAs, digital still and video cameras, handheld terminals, and MP3 or multimedia players.
- How does the bq27541-V200 handle battery aging and self-discharge?
The device automatically adjusts for battery aging, self-discharge, and temperature/rate inefficiencies to maintain accurate fuel gauging predictions.
