BQ27531-G1_16 Datasheet, PDF (21/34 Pages) Texas Instruments – Battery Management Unit Impedance Track Fuel Gauge

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9 Application and Implementation
bq27531-G1
SLUSBE7C – MARCH 2013 – REVISED JANUARY 2016
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.
9.1 Application Information
The fuel gauge can control a bq2419x Charger IC without the intervention from an application system processor.
Using the bq27531-G1 and bq2419x chipset, batteries can be charged with the typical constant-current,
constant-voltage (CCCV) profile or charged using a Multi-Level Charging (MLC) algorithm.
9.2 Typical Application
Vin
1
GND ²
J1
C5
1.0uF
VCC
PSEL
PG
STAT
BSCL
BSDA
OTG
CE
REGN
R2
R7
80.6k
169
R11
100k
U1
BQ2419xRGE
1 _{VBUS VBUS} 24
2 _PSEL
3 _PG
4 _STAT
PMID ²³
REGN ²²
BTST ²¹
5 _SCL
6 _SDA
7 _INT
SW ²⁰
SW ¹⁹
PGND ¹⁸
8 _{OTG PGND} 17
9 _CE
SYS ¹⁶
10 _ILIM
SYS ¹⁵
11 _{TS 1}
BAT ¹⁴
12 _TS2
BAT ¹³
PwPd
C1 C2
10uF 10uF
REGN
4.7uF C6
C7
47nF
SW
SYS
C13
10uF
C14
1uF
L1
2.2uH
1
2
SYS
C8
C9 C10
10uF 10uF 1uF
C11
0.1uF
J5
System Output
2
1 ^GND
TP13
BAT+
R17
10.0k
R18
10.0k
SDA
4
SCL
3
VSS
2
1
J10
SDA SCL
J P3
OTG
CE
R19
R20
J P4
1MΩ
SYS ^1MΩ
R8
2.21k
SYS
R9
2.21k
SYS
D1 Green
D2 Green
STAT
PG
R23
10.0k
SOC_INT ₂
VSS ₁
J13
VCC
SOC_INT
R21
1.80M
C18
0.033uF
R22
18.2k
TS_GAUGE
R25
1.00k
C15
0.1uF
VCC
C17
1.0uF
SDA
SCL
SYS
U2
BQ27531-G1YFF
E1
D1
B3
A3
E3
D3
C2
C1
REGIN
BAT
VCC
CE
SDA _{SOC_INT}
SCL
BSCL
BI/TOUT _BSDA
TS
SRN
VSS
VSS
SRP
E2
D2
A2
B2
C3
B1
A1
SYS
SOC_INT
BSCL
BSDA
C16
0.1uF
0.1uF
C19
C20
0.1uF
Only needed when the
Gauge is monitoring the
battery NTC.
BAT+
Vin Max: 4.4V
Current max: 4A
TS_GAUGE
0.01
R24
3 ^PACK+
2T
1 ^PACK-
J12
Figure 12. Typical Application Schematic
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