AS3658F-BCTP datasheet(52/158 Pages) AMSCO

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Table 44. USB-Charger additional trimming

Addr:130

USB Current control

This register adds or subtracts current limit

Bit

Bit Name

Default Access

Description

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Revision 1v13

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AS3658

Data Sheet Confidential - Detail ed Descri ption-Power Management Functions

8.9

Battery Charge Controller

The AS3658 device serves as a standalone battery charge controller supporting rechargeable lithium ion (Li+) and

nickel metal hybrid (NiMH) batteries. Requiring only a few external components, a full-featured battery charger with a

high degree of flexibility can easily be realized. The main features of the controller are:

Charge adapter detection

Charging of deeply discharged batteries

Low current (trickle) charging

Real constant current charging by regulation of the battery current instead of the charge current

2 different top-off charging modes: Pulse charging and constant voltage charging

Fuel gauge enables highly accurate remaining capacity estimation of the battery

Overvoltage protection for charge adapter input and main battery

Battery presence indication

Operation without battery

Reverse polarity and short protection

Charging timout timer

Battery NTC supervision

8.9.1 Charge Controller Operating Modes and Building Blocks

Linear Step down Charger detection

The charging circuit automatically detects, if a step down charger or a linear charger is connected externally, by

measuring the voltage on the pin VOFF_B. If this pin is tied to GND, the circuit detects a linear charger. Otherwise the

step down charger is detected

Charge adapter detection

The charge controller uses an integrated detection circuit to determine if an external charge adapter has been applied

to the VCHARGER or V_USB pin. If the adapter voltage exceeds the supply voltage at pin V_SUPPLY5 by VCHDET the

ChDet or USB_CHDet bit in the Charger Status register will be set. The detection circuit will reset the charge controller

(ChDet or USB_CHDet is cleared) as soon as the voltage at the VCHARGER or USB_CHDet pin drops to only VCHMIN

2:0

usb_add_trim_current

00h

R/W

Increase or decrease The USB current limit for additional in

system trimming:

100

usbcurrent-5.1%

101

usbcurrent-3.8%

110

usbcurrent-2.5%

111

usbcurrent-1.2%

000

usbcurrent+0%

001

usbcurrent+1.2%

010

usbcurrent+2.5%

011

usbcurrent+3.8%

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