Active-Semi
PIN DESCRIPTIONS
PIN
1
ACT8828
Rev 3, 24-Sep-09
NAME
TH
DESCRIPTION
Temperature Sensing Input. Connect to battery thermistor. TH is pulled up with a 100µA current
internally. See the
Battery Temperature Monitoring
section for more information.
Dynamic Charging Current Control. Connect a resistor to set the dynamic charging current control
point. A internal 100µA current source sets up a voltage that is used to compare with VSYS and
dynamically scale the charging current to maintain VSYS regulation. See the
Dynamic Charge
Current Control
section for more information.
Safety Timer Program Pin. The resistance between this pin and GA determines the timers timeout
values. See the
Charging Safety Timers
section for more information.
AC Adaptor Detect. Detects presence of a wall adaptor and automatically adjusts the charge
current to the maximum charge current level. Do not leave ACIN floating.
Battery Charger Output. Connect this pin directly to the battery anode (+ terminal)
System Output Pin. Bypass to GA with a 10µF or larger ceramic capacitor.
Power Input for the Battery Charger. Bypass CHG_IN to GA with a capacitor placed as close to
the IC as possible. The battery charger are automatically enabled when a valid voltage is present
on CHG_IN.
Charge Current Set. Program the maximum charge current by connecting a resistor (R
ISET
) between
ISET and GA. See the
Charger Current Programming
section for more information.
Step-Down DC/DCs Output Voltage Selection. Drive to logic low to select default output voltage.
Drive to logic high to select secondary output voltage. See the
Output Voltage Selection Pin
section for more information.
Independent Enable Control Input for REG1. Drive ON1 to VSYS or to a logic high for normal
operation, drive to GA or a logic low to disable REG1. Do not leave ON1 floating.
Output Feedback Sense for REG2. Connect this pin directly to the output node to connect the
internal feedback network to the output voltage.
Power Input for REG2. Bypass to GP2 with a high quality ceramic capacitor placed as close as
possible to the IC.
Switching Node Output for REG2. Connect this pin to the switching end of the inductor.
Power Ground for REG2. Connect GA, GP1, GP2, GP3, and GP4 together at a single point as
close to the IC as possible.
Power Ground for REG1. Connect GA, GP1, GP2, GP3, and GP4 together at a single point as
close to the IC as possible.
Switching Node Output for REG1. Connect this pin to the switching end of the inductor.
Power Input for REG1. Bypass to GP1 with a high quality ceramic capacitor placed as close as
possible to the IC.
Output Feedback Sense for REG1. Connect this pin directly to the output node to connect the
internal feedback network to the output voltage.
Enable Control Input for REG3. Drive ON3 to a logic high for normal operation, drive to GA or a
logic low to disable REG3. Do not leave ON3 floating.
Clock Input for I
2
C Serial Interface.
Data Input for I
2
C Serial Interface. Data is read on the rising edge of SCL.
2
DCCC
3
4
5, 6
7, 8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
BTR
ACIN
BAT
VSYS
CHG_IN
ISET
VSEL
ON1
OUT2
VP2
SW2
GP2
GP1
SW1
VP1
OUT1
ON3
SCL
SDA
Innovative Power
TM
ActivePMU
and
ActivePath
are trademarks of Active-Semi.
I
2
C
TM
is a trademark of Philips Electronics.
TM
TM
-5-
www.active-semi.com
Copyright © 2009 Active-Semi, Inc.
ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
