参数资料
型号: AS3658-BCTP
厂商: ams
文件页数: 50/158页
文件大小: 0K
描述: IC PMU POWER/AUDIO 124-CTBGA
标准包装: 2,500
应用: 便携式设备
电流 - 电源: 7mA
电源电压: 3 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 124-TFBGA
供应商设备封装: 124-CTBGA(8x8)
包装: 带卷 (TR)
AS3658
Data Sheet Confidential
- Detailed Description-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 V BAT voltage limit is set by the
register ChVoltEOC (3.9V – 4.25V in 50mV steps; identical for USB charger and step down charger) and the current
limit is set by the register usb_current (94mA to 881mA). The Vsupply voltage limit is set to V chlimit 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
USB Charger control
Addr: 10
This register controls the mode of the USB charger, and the charger state
machine
Bit
Bit Name
Default Access
Description
Sets the USB input current limit.
(0000)b
(0001)b
(0010)b
(0011)b
(0100)b
(0101)b
(0110)b
94mA (USB low current)
141mA
189mA
237mA
285mA
332mA
380mA
3:0
usb_Current
ROM
R/W
(0111)b
428mA
(1000)b
(1001)b
(1010)b
(1011)b
(1100)b
(1101)b
(1110)b
(1111)b
470mA (USB high current)
517mA
598mA
668mA
759mA
881mA
881mA (do not use)
881mA (do not use)
ON/OFF control of USB charger
4
usb_chgEn
ROM
R/W
0
USB charger disabled.
1
USB charger enabled.
www.austriamicrosystems.com
Revision 1v13
49 - 157
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