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BQ27743 Datasheet(数据表) 30 Page - Texas Instruments

部件型号  BQ27743
说明  Single-Cell Li-Ion Battery Fuel Gauge with Programmable Hardware Protection
下载  42 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 

 30 page
background image
VPWR
BAT
REG25
TS
SRN
SRP
PACKP
CHG
PRES
DSG
INT/PSC
SDA
VSS
SCL
HDQ/PSD
0.1 µF
10 Ω
0.1 µF
10 Ω
1 µF
0.47 µF
0.1 µF
0.1 µF
0.1 µF
5 mΩ
200 Ω
200 Ω
1 kΩ
1 kΩ
2 kΩ
100 Ω
100 Ω
0.1 µF
10 kΩ
(25°C )
PACK+
HDQ
PACK–
0.1 µF
0.1 µF
0.1 µF
0.1 µF
4.7 kΩ
30
bq27743
SLUSCM0A – JUNE 2017 – REVISED SEPTEMBER 2018
www.ti.com
Product Folder Links: bq27743
Submit Documentation Feedback
Copyright © 2017–2018, Texas Instruments Incorporated
Typical Applications (continued)
Figure 20. HDQ Mode Schematic
9.2.2 Design Requirements
Several key parameters must be updated to align with a given application's battery characteristics. For highest
accuracy gauging, it is important to follow up this initial configuration with a learning cycle to optimize resistance
and maximum chemical capacity (Qmax) values prior to sealing and shipping packs to the field. Successful and
accurate configuration of the fuel gauge for a target application can be used as the basis for creating a "golden"
gas gauge (.GG) file that can be written to all production packs, assuming identical pack design and Li-Ion cell
origin (chemistry, lot, and so on). Calibration data can be included as part of this golden GG file to cut down on
battery pack production time. If going this route, it is recommended to average the calibration data from a large
sample size and use these in the golden file. Ideally, it is recommended to calibrate all packs individually as this
will lead to the highest performance and lowest measurement error in the end application on a per-pack basis. In
addition, the integrated protection functionality should be correctly configured to ensure activation based on the
fault protection needs of the target pack design, or else accidental trip could be possible if using defaults.
Table 11, Key Data Flash Parameters for Configuration, shows the items that should be configured to achieve
reliable protection and accurate gauging with minimal initial configuration.
Table 11. Key Data Flash Parameters for Configuration
NAME
DEFAULT
UNIT
RECOMMENDED SETTING
Design Capacity
1000
mAh
Set based on the nominal pack capacity as interpreted from cell manufacturer's
datasheet. If multiple parallel cells are used, should be set to N × Cell Capacity.
Design Energy
3800
mWh
Set based on the nominal pack energy (nominal cell voltage × nominal cell
capacity) as interpreted from the cell manufacturer's datasheet. If multiple parallel
cells are used, should be set to N × Cell Energy.




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