DATA SHEET
AAT3682
Li-Ion/Polymer Linear Battery Charger
Sleep/Charge Complete mode. In addition, the T2X input
must be tied to VCC through a 100k resistor. In this
mode, the trickle charge current will be 1.8X the normal
trickle charge level. To reset the trickle charge current to
the 1X level, the TS input must be temporarily toggled
low. Removing C3 forces the LED status to gradually dim
as the battery becomes fully charged (see Figure 5).
High-Speed Data Reporting
An optional system microcontroller interface can be
enabled by pulling the T2X pin up to 4.5V to 5.5V during
the power-up sequence. The T2X pin should be pulled
high with the use of a 100k resistor. If the input supply
to VIN will not exceed 5.5V, then the T2X pin may be tied
directly to VIN through a 100k resistor. Since this is a
TTL level circuit, it may not be pulled higher than 5.5V
without risk of damage to the device.
Protection Circuitry
The AAT3682 is a highly integrated battery management
system IC including several protection features. In addi-
tion to battery temperature monitoring, the IC constant-
ly monitors for over-current and over-voltage conditions;
if an over-current situation occurs, the AAT3682 latches
off the pass device to prevent damage to the battery or
the system, and enters shutdown mode until the over-
current event is terminated. An over-voltage condition is
defined as a condition where the voltage on the BAT pin
exceeds the maximum battery charge voltage. If an over-
voltage condition occurs, the IC turns off the pass device
until voltage on the BAT pin drops below the maximum
battery charge constant voltage threshold. The AAT3682
will resume normal operation after the over-current or
over-voltage condition is removed. During an over-cur-
rent or over-voltage event, the STAT will report a FAULT
signal. In the event of a battery over-temperature condi-
tion, the IC will turn off the pass device and report a
FAULT signal on the STAT pin. After the system recovers
from a temperature fault, the IC will resume operation in
the 1X trickle charge mode to prevent damage to the
system in the event a defective battery is placed under
charge. Once the battery voltage rises above the trickle
charge to constant current charge threshold, the IC will
resume the constant current mode.
When the high-speed data report feature is enabled, the
STAT output periods are sped up to 40μs, making the
total status word 160μs in length. See Figure 4 below.
An additional feature is the Output Status for the Battery
Not Detected state. When the AAT3682 senses there is
no battery connected to the BAT pin, the STAT pin cycles
for two periods, then remains off for two periods. When
in high-speed data reporting, the AAT3682 will only
trickle charge at the 2X trickle charge level. This is
because the T2X pin is pulled high to enable the high-
speed data reporting. A status display LED may not be
connected to the STAT pin when the high-speed data
reporting is being utilized. If both display modes are
required, the display LED must be switched out of the
circuit before the T2X pin is pulled high. Failing to do so
could cause problems with the high-speed switching con-
trol circuits internal to the AAT3682.
Charge Complete LED Status Mode
A simplified LED status can be obtained by configuring
the AAT3682 for high-speed data reporting mode (T2X
tied to VCC) and installing a 0.047μF capacitor from the
STAT pin to the VSS pin (see Figure 5). In this configura-
tion, the LED will be illuminated for all modes except the
Charge Status
Sleep / Charge Complete
Temp., OC, OV Fault
Battery Conditioning
Output Status
HI / HI / HI / HI
STAT Level
LO / LO / HI / HI
LO / LO / LO / LO
LO / LO / LO / HI
LO / HI / HI / HI
Constant Current Mode
Constant Voltage Mode
Figure 4: Microcontroller Interface Logic Output.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
12
201884B
• Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
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