AS3658F-BCTP datasheet(50/158 Pages) AMSCO

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AS3658

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

The AS3658 serves an integrated USB charger for Li+ batteries. The USB Charger is a current and voltage limited

charger, which can be used to charge Li+ batteries directly from the USB supply. The VBAT voltage limit is set by the

limit is set by the register usb_current (94mA to 881mA). The Vsupply voltage limit is set to Vchlimit during trickle and

constant current charging.

For USB charging, it is recommended to start with a current limit of 94mA and after negotiates via the USB bus (this

has to be done by e.g. the uProcessor directly) a different current setting can be set to speed up charging (e.g.

470mA).

If Bit usb_chgEn=1 in the Boot ROM is set, VSUPPLY can start up with USB supply allowing startup from the USB

supply.

If ChEn=1 and chdet=1 (external charger enabled and connected) the usb_charger will be deactivated automatically.

(The Battery charger overrides the USB charger). It's not possible to use the internal and the external charger in

parallel.

End of charge of the USB charger is reached, if the current through the battery falls below the value set in the

Tricklecurrent [1:0] register.

Table 41. USB-Charger Bit definitions

Addr: 10

USB Charger control

This register controls the mode of the USB charger, and the charger state

machine

Bit

Bit Name

Default Access

Description

3:0

usb_Current

ROM

R/W

Sets the USB input current limit.

(0000)b

94mA (USB low current)

(0001)b

141mA

(0010)b

189mA

(0011)b

237mA

(0100)b

285mA

(0101)b

332mA

(0110)b

380mA

(0111)b

428mA

(1000)b

470mA (USB high current)

(1001)b

517mA

(1010)b

598mA

(1011)b

668mA

(1100)b

759mA

(1101)b

881mA

(1110)b

881mA (do not use)

(1111)b

881mA (do not use)

usb_chgEn

ROM

R/W

ON/OFF control of USB charger

USB charger disabled.

USB charger enabled.

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