ACT8935
Rev 4, 17-Sep-13
PIN DESCRIPTIONS CONT’D
PIN
NAME
DESCRIPTION
Charge Current Set. Program the charge current by connecting a resistor (RISET) between ISET
and GA. See the Charge Current Programming section for more information.
23
ISET
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.
24
25
TH
System Wake Up Input. Drive to VSYS or a logic high to wake up the IC from Sleep Mode or
Deep Sleep Mode.
EXTON
26
27
SCL
SDA
Clock Input for I2C Serial Interface.
Data Input for I2C 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.
28
nSTAT
29, 30
31, 32
BAT
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.
VSYS
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 .
33
34
CHGIN
OUT2
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.
35
36
37
38
39
VP2
SW2
GP12
SW1
VP1
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.
40
NC
EP
No Connect. Not internally connected.
EP
Exposed Pad. Must be soldered to ground on PCB.
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