ACT5880 datasheet(84/87 Pages) ACTIVE-SEMI

84 / 87 page

ACT5880

Rev 2, 03-Sep-13

- 84 -

www.active-semi.com

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could start normal operation and possibly changes

the I/O output, the ACT5880 preconditions and then

charges battery with only 90mA current limit, as

specified in the "Battery Charging", until the battery

is charged to high enough voltage for device

system to start.

If USB attaching is identified in a battery normal

system, the device system should start and try to

connect the host within 100ms, as required by the

USB protocol. Within this 100ms, 100mA drawn

from the port is allowed, what is greater than the

90mA the ACT5880 takes. After the connection ,

the device system takes control of charging, either

charging as a standard load to USB port or pouring

larger current as allowed, or turning into USB

SUSPEND without charging.

Fast Charge Current Adaptive

The over load to the USB port or a weak adaptor

could be identified by the loss of reading CHGIN

valid while the ACIN keeps reading valid. If the over

load happens, the device system could program the

ACT5880 to a less fast charge current volume to

make the power source normal while still getting as

much as possible power.

Dual inputs and USB-OTG Paths

In applications that 2 power input receptacles

wanted, 2 low forward voltage diodes and a 240kΩ

resistor RDAD are used in addition to circuit in Figure

20, as showed in Figure 21. When no suitable input

attaches to the Adaptor In, the circuit works

similarly to the circuit in the Figure 20. When

suitable input attaches to the Adaptor In, both ACIN

and CHGIN are read valid, regardless what

attaches to the USB receptacle.

Figure 21:

The Sample Circuit for Dual-inputs Charging.

Figure 22 is the typical circuit connecting a 5V

internal rail to the VBUS for providing power for

OTG application. In this circuit the QOTG has to be

with VGTH greater than 2V and to be effectively

conductive when VGTH is 5V. The QOTG is used to

isolate the capacitance on 5V rail during the VBUS

pulsing required by the SRP, and also provides a

controlled path for using the external 5V from VBUS

to replace the internal 5V rail.

Figure 22:

The Sample Circuit for Using External 5V rail.

Figure 23:

The Sample Circuit of Dual-inputs and External

5V.

Figure 23 is a sample of providing high current 5V

from an adaptor to the VBUS and for replacing the

internal 5V rail. All the 3 PFETs should be good for

control with 3V I/O, level shifters are desired

otherwise.

ACIN

RISO

ACT5880

DDN

DDP

Device

USB I/F

RDUP

RDDW

VBUS

CHGIN

D+

D-

RDAD

Adaptor In

Foreign

Adaptor

or USB

VBUS

USB connectors

ACT5880

VCC

Device

System

VBUS

D+

D-

VBUS

RIDUP

5V rail

CHGIN

3V I/O

QOTG

ACIN

RISO

ACT5880

DDN

DDP

Device

USB I/F

RDUP

RDDW

VBUS

CHGIN

D+

D-

RDAD

Adaptor In

VCC

RIDUP

5V rail

3V I/O

QOTG

VBUS

3V I/O

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