BQ27750 Datasheet, PDF (21/34 Pages) Texas Instruments – Impedance Track Battery Gas Gauge and Protection Solution for 1-Series Cell Li-Ion Battery Packs

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8 Application and Implementation
bq27750
SLUSCM7 – JUNE 2017
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The bq27750 gas gauge is a primary protection device that can be used with a 1-series Li-Ion/Li Polymer battery
pack. To implement and design a comprehensive set of parameters for a specific battery pack, the user needs
Battery Management Studio (bqStudio), which is a graphical user-interface tool installed on a PC during
development. The firmware installed in the product has default values, which are summarized in the bq27750
Technical Reference Manual (SLUUBI6) for this product. Using the bqStudio tool, these default values can be
changed to cater to specific application requirements during development once the system parameters, such as
fault trigger thresholds for protection, enable/disable of certain features for operation, configuration of cells,
chemistry that best matches the cell used, and more are known. This data can be referred to as the "golden
image."
8.2 Typical Applications
The following is the bq27750 application schematic for the 1-series configuration.
Pack +
10 MΩ
10 MΩ
I2C
Comms
100 Ω 100 Ω
100 Ω
100 Ω
1 ^VSS
2 ^SRN
3 ^SRP
4 ^TS1
5 ^SCL
6 ^SDA
10 kΩ NTC
13
PWPD
10 Ω
VCELL
/INT
12
BAT 11
PBI 10
CHG 9
PACK 8
DSG ₇
0.1 µF
2.2 µF
100 Ω
0.1 µF
100 Ω
Pack–
1 to 10 mΩ
Copyright © 2017, Texas Instruments Incorporated
Figure 20. bq27750 1-Series Cell Typical Implementation
Copyright © 2017, Texas Instruments Incorporated
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