STw4102 STMicroelectronics, STw4102 Datasheet - Page 14

• Manufacturer Part Number: STw4102
• Description: Dual source USB Li-ion charger with gas gauge
• Manufacturer: STMicroelectronics

Application schematics
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5.1
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Application schematics
Charge from USB or wall adapter
The MAIN input is used with either a wall adapter or a USB charger. The charge current can
be programmed to 100 mA or 500 mA max for use with a USB 2.0 port, or programmed to
the value set by the R
The USBPWR input is used only for charging from a USB port (100 mA or 500 mA max).
Figure 16. Charge using internal power devices
Table 8.
from wall adapter
or USB port/charger
Name
from USB port only
R
R
C1
C2
C3
C4
C5
set
cg
management
to power
External component list
Indicator LED
Reset
battery voltage
IO voltage
12k to 120k
0.1 to 22µF
C2
Typ. value
0.1 to 1µF
0.1 to 1µF
C4
C5
30mΩ
1µF
1µF
set
SCL
SDA
USBPWR
RESETN
VIO
EOCHG
LDODRV
LDOFB
MAIN
CVREF
resistor for use with a wall adapter or a dedicated USB charger.
PWRDETECTN
Tolerance
1%
1%
DRIVER
STw4102
Main charge current setting
Gas gauge sense resistor
Internal supply decoupling capacitor
Internal voltage reference decoupling capacitor
When the battery is removed, a capacitor of at least
15µF is required for low ripple on the battery line.
MAIN input decoupling capacitor
USBPWR input decoupling capacitor
GND
TEST
BATTSENSE
C32KHZ
STDBY
Comments
SENSE
VOUT
BATT
ICG+
ICG-
CVIS
ISET
32kHz
StandBy
Rset
C1
C3
STw4102
Rcg