BQ27541-V200_17 Datasheet, PDF (8/46 Pages) Texas Instruments – Single Cell Li-Ion Battery Fuel Gauge for Battery Pack Integration

bq27541-V200
Not Recommended for New Designs
SLUSA11B – FEBRUARY 2010 – REVISED SEPTEMBER 2013
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The bq27541 measures charge/discharge activity by monitoring the voltage across a small-value series sense
resistor (5 mΩ to 20 mΩ typ.) located between the CELL-and the battery’s PACK-terminal. When a cell is
attached to the bq27541, cell impedance is computed, based on cell current, cell open-circuit voltage (OCV), and
cell voltage under loading conditions.
The bq27541 external temperature sensing is optimized with the use of a high accuracy negative temperature
coefficient (NTC) thermistor with R25 = 10kΩ ± 1% and B25/85 = 3435kΩ ± 1% (such as Semitec 103AT for
measurement). The bq27541 can also be configured to use its internal temperature sensor. The bq27541 uses
temperature to monitor the battery-pack environment, which is used for fuel gauging and cell protection
functionality.
To minimize power consumption, the bq27541 has different power modes: NORMAL, SLEEP, FULLSLEEP, and
HIBERNATE. The bq27541 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. e.g. RemainingCapacity( )
Data Flash: italics, bold, and breaking spaces. e.g. Design Capacity
Register bits and flags: italics with brackets[ ]. e.g. [TDA]
Data flash bits: italics, bold, and brackets[ ]. e.g: [LED1]
Modes and states: ALL CAPITALS. e.g. UNSEALED mode
do not delete this subsection
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