Datasheet

bq27541-G1
SLUSAL6C –NOVEMBER 2011–REVISED OCTOBER 2012 www.ti.com
The bq27541-G1 measures charge and 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-G1, cell impedance is learned based on cell current, cell open-circuit voltage (OCV),
and cell voltage under loading conditions.
The bq27541-G1 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-G1 can also be configured to use its internal temperature sensor. The
bq27541-G1 uses temperature to monitor the battery-pack environment, which is used for fuel gauging and cell
protection functionality.
To minimize power consumption, the bq27541-G1 has different power modes: NORMAL, SLEEP, FULLSLEEP,
and HIBERNATE. The bq27541-G1 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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Product Folder Links: bq27541-G1