ACT8934A
Rev 1, 22-Oct-12
PIN DESCRIPTIONS CONT’D
PIN
23
NAME
ISET
DESCRIPTION
Charge Current Set. Program the charge current by connecting a resistor (R
ISET
) between ISET
and GA. See the
Charge Current Programming
section for more information.
Temperature Sensing Input. Connect to battery thermistor. TH is pulled up with a 102µA (typ) current
internally. See the
Battery Temperature Monitoring
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 Programming
section for more information.
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.
Active-Low Open-Drain Charger Status Output. nSTAT has a 8mA (typ) current limit, allowing it
to directly drive an indicator LED without additional external components. See the
Charge Status
Indicator
section for more information.
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 CHGIN to GA with a capacitor placed as close to
the IC as possible. The battery charger is automatically enabled when a valid voltage is present
on CHGIN.
Output Feedback Sense for REG2.
Power Input for REG2. Bypass to GP12 with a high quality ceramic capacitor placed as close to
the IC as possible.
Switching Node Output for REG2.
Power Ground for REG1 and REG2. Connect GA, GP12 and GP3 together at a single point as
close to the IC as possible.
Switching Node Output for REG1.
Power Input for REG1. Bypass to GP12 with a high quality ceramic capacitor placed as close to
the IC as possible.
No Connect. Not internally connected.
Exposed Pad. Must be soldered to ground on PCB.
24
TH
25
26
27
28
29, 30
31, 32
33
34
35
36
37
38
39
40
EP
VSEL
SCL
SDA
nSTAT
BAT
VSYS
CHGIN
OUT2
VP2
SW2
GP12
SW1
VP1
NC
EP
Innovative Power
TM
ActivePMU
TM
and
ActivePath
TM
are trademarks of Active-Semi.
I
2
C
TM
is a trademark of NXP.
-6-
www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
