ACT8941A datasheet(6/42 Pages) ACTIVE-SEMI

6 / 42 page

ACT8941A

Rev 0, 12-Mar-13

- 6 -

www.active-semi.com

ActivePMU

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I2CTM is a trademark of NXP.

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Active-Semi Proprietary―For Authorized Recipients and Customers

PIN DESCRIPTIONS CONT’D

NAME

DESCRIPTION

VSEL

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.

SCL

Clock Input for I2C Serial Interface.

SDA

Data Input for I2C Serial Interface. Data is read on the rising edge of SCL.

nSTAT

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.

29, 30

BAT

Battery Charger Output. Connect this pin directly to the battery anode (+ terminal)

31, 32

VSYS

System Output Pin. Bypass to GA with a 10µF or larger ceramic capacitor.

CHGIN

Power Input for the Battery Charger. Bypass CHGIN to GA with a capacitor placed as close to

the IC as possible.

OUT2

Output Feedback Sense for REG2.

VP2

Power Input for REG2. Bypass to GP12 with a high quality ceramic capacitor placed as close to

the IC as possible.

SW2

Switching Node Output for REG2.

GP12

Power Ground for REG1 and REG2. Connect GA, GP12 and GP3 together at a single point as

close to the IC as possible.

SW1

Switching Node Output for REG1.

VP1

Power Input for REG1. Bypass to GP12 with a high quality ceramic capacitor placed as close to

the IC as possible.

NC2

No Connect. Not internally connected.

Exposed Pad. Must be soldered to ground on PCB.

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.

ISET

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.

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