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BQ27425-G2 Datasheet(PDF) 7 Page - Texas Instruments |
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BQ27425-G2 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 35 page bq27425-G2 www.ti.com SLUSB23A – OCTOBER 2012 – REVISED FEBRUARY 2013 GENERAL DESCRIPTION The bq27425 accurately predicts the battery capacity and other operational characteristics of a single Li-based rechargeable cell. It can be interrogated by a system processor to provide cell information, such as state-of- charge (SOC). Information is accessed through a series of commands, called Standard Commands. Further capabilities are provided by the additional Extended Commands set. Both sets of commands, indicated by the general format Command( ), are used to read and write information contained within the bq27425 control and status registers, as well as its data locations. Commands are sent from system to gauge using the bq27425’s I2C serial communications engine, and can be executed during application development, system manufacture, or end- equipment operation. The key to the bq27425’s high-accuracy gas gauging prediction is Texas Instrument’s proprietary Impedance Track™ algorithm. This algorithm uses cell measurements, characteristics, and properties to create state-of- charge predictions that can achieve high accuracy across a wide variety of operating conditions and over the lifetime of the battery. The bq27425 measures charge/discharge activity by monitoring the voltage across a small-value integrated sense resistor (10 m Ω typical) located between the system’s Vss and the battery’s PACK– terminal. When a cell is attached to the bq27425, cell impedance is computed, based on cell current, cell open-circuit voltage (OCV), and cell voltage under loading conditions. The bq27425 uses an integrated temperature sensor for estimating cell temperature. Alternatively, the host processor can provide temperature data for the bq27425. To minimize power consumption, the bq27425 has several power modes: INITIALIZATION, NORMAL, SLEEP, and HIBERNATE. The bq27425 passes automatically between these modes, depending upon the occurrence of specific events, though a system processor can initiate some of these modes directly. More details can be found in Section Power Modes. NOTE FORMATTING CONVENTIONS IN THIS DOCUMENT: Commands: italics with parentheses and no breaking spaces, that is, RemainingCapacity( ). NVM Data: italics, bold, and breaking spaces, that is, Design Capacity. Register bits and flags: brackets and italics, that is, [TDA] NVM Data bits: brackets, italics and bold, that is: [LED1] Modes and states: ALL CAPITALS, that is, UNSEALED mode. Copyright © 2012–2013, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: bq27425-G2 |
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