ACT8712 View Datasheet(PDF) - Active-Semi, Inc

Part Name

Description

Manufacturer

ACT8712

Four Channel Integrated Power Management IC for Handheld Portable Equipment

Active-Semi, Inc 

ACT8712

Rev0, 25-Feb-08

PIN DESCRIPTIONS

PIN

NAME

DESCRIPTION

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

1

VIN the IC as possible. The battery charger and both step-down DC/DCs (REG1 and REG2)

are automatically enabled when a valid voltage is present on VIN.

2

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

3

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

4

nIRQ

Open-Drain Push-Button Status Output. nIRQ is an open-drain output which sinks current

when nMSTR is asserted.

5

nMSTR Master Enable Input. Drive nMSTR to GA or to a logic low to enable IC.

6

nRSTO

Open-Drain Reset Output. nRSTO asserts low for the reset timeout period of 300ms when-

ever the IC is enabled.

7

OUT1

Output Feedback Sense for REG1. Connect this pin directly to the output node to connect

the internal feedback network to the output voltage.

8

VP1

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

close as possible to the IC.

9

SW1 Switching Node Output for REG1. Connect this pin to the switching end of the inductor.

10

GP12

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

point as close to the IC as possible.

11

SW2 Switching Node Output for REG2. Connect this pin to the switching end of the inductor.

12

VP2

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

close as possible to the IC.

13

OUT2

Output Feedback Sense for REG2. Connect this pin directly to the output node to connect

the internal feedback network to the output voltage.

Enable Control Input for REG3. ON2 is functional only when ON1 is driven high, nMSTR is

14

ON2 driven low, or when a valid supply voltage is present on VIN. Drive ON2 to VSYS or to a

logic high for normal operation, drive to GA or a logic low to disable REG3.

15

ON1

Enable Control Input for REG1 and REG2. Drive ON1 to VSYS or to a logic high for normal

operation, drive to GA or to a logic low to disable REG1 and REG2.

Power Bypass for System Management Circuitry. Bypass to GA with a high quality ceramic

16

VSYS capacitor placed as close as possible to the IC. VSYS is internally connected to the higher

voltage of either VVIN or VBAT. Do not load VSYS with more than 100µA.

Innovative Products. Active Solutions.

-5-

ActivePMUTM is a trademark of Active-Semi.

I2CTM is a trademark of Philips Electronics.

www.active-semi.com

Copyright © 2008 Active-Semi, Inc.

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