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AS3658 Datasheet(PDF) 39 Page - ams AG

Part # AS3658
Description  Power and Audio Management Unit for Portable Devices
PDF  158 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS3658 Datasheet(HTML) 39 Page - ams AG

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www.austriamicrosystems.com
Revision 1v13
38 - 157
AS3658
Data Sheet Confidential - Detail ed Descri ption-Power Management Functions
8.4
Backup Battery Charger
The backup battery charger operates as a programmable voltage limited current source with a selectable output
resistor. It is enabled by setting BBCMode in the Backup Battery Charger register to a value other than ‘00’b and offers
the following features:
Backup battery presence detection
Selectable output resistor (RBBCOUT) to reduce the current at higher voltages
Programmable charge current IBBC
programmable maximum charging voltage VBBC
Reverse current protection turns off backup battery charger automatically if VSUPPLY<VVBACK; as soon as VSUPPLY
exceeds VVBACK charging is started again automatically
Charging is stopped automatically as soon as the backup battery is fully charged; if the voltage on pin VBACK
drops charging is started again automatically
In case the main supply voltage VSUPPLY is larger than VVBACK charging of the backup battery is possible in state
“Off” as well; the device will check VVBACK every minute to determine if charging is required.
6
sd3_gpio
0
R/W
Sd3 on/off control
0
Controlled by software (sd3_on)
1
Controlled by CURR3_GPIO3, if sd3_on=1 and
GPIO3IOSF=10b
Controlled by CURR4_GPIO4, if sd3_on=0 and
GPIO4IOSF=10b
7
ldo_dig3_gpio
0
R/W
ldo_dig3 on/off control
0
Controlled by software (ldo_dig3_on)
1
Controlled by CURR3_GPIO3, if ldo_dig3_on=1 and
GPIO3IOSF=10b
Controlled by CURR4_GPIO4, if ldo_dig3_on=0 and
GPIO4IOSF=10b
Table 32. Regulator GPIO Control Registers
Addr: 31
Reg GPIO Ctrl
This register enables/disables GPIO control of the regulators
Bit
Bit Name
Default Access
Description



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