AS3722 datasheet(148/199 Pages) AMSOSRAM

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ams Datasheet

Page 147

[v1-01] 2015-Sep-07

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AS3722 − Register Description

Figure 163:

BBcharger

Addr:57h

BBcharger

Bit

Bit Name

Default

Access

Bit Description

BBCActive

Status of backup battery charger

0 : Charger is not active

1 : Charger charges backup battery

BBCPwrSave

0 : Normal operation of the backup battery

charger

1 : The backup battery charger checks if it is

actually charging the battery (bit BBCActive=1)

and it is disabled if it is not. Every 10s (every 64s in

state Off ) the voltage of the backup battery is

checked again to determine if charging is

required. This practically reduces the current

consumption to 0 if the backup battery is full.

BBCVolt

This value determines the maximum charging

voltage VBBC

0 : VBBC=2.5V

1 : VBBC=3.0V

4:3

BBCCur

This value determines the charge current IBBC

0 : IBBC=50uA

1 : IBBC=100uA

2 : IBBC=200uA

3 : IBBC=400uA

2BBCResOff

0 : Enable output resistor

1 : Bypass output resistor

1:0

BBCMode

Enable and disable backup battery charger.

Activation in PowerOff and standby mode requires

32kHz OSC to be enabled (rtc_on=1).

0 : Backup battery charger is disabled

1 : Backup battery charger is enabled in state

Active mode

2 : Backup battery charger is enabled in states

Active mode and Standby mode

3 : Backup battery charger is enabled in states

PowerOff mode, Active mode and Standby mode

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