AS3658F-BCTP datasheet(40/158 Pages) AMSCO

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Revision 1v13

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AS3658

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

Figure 10. Backup Battery Charger Block Diagram

Table 33. Backup Battery Charger Characteristics

symbol

Parameter

Min

Typ

Max

Unit

Note

VSUPPLY

Supply voltage range

3.0

5.5

BBCVolt=’0’

3.3

5.5

BBCVolt=’1’

VBBC

Maximum charging

voltage

2.4

2.5

2.6

BBCVolt=’0’

2.9

3.0

3.1

BBCVolt=’1’

IBBC

Charge current

-30%

BBCCur +30%

Value is set by BBCCur in the

Backup Battery Charger register

VDELTA

Delta voltage for

resistive mode

160

220

300

BBCResOff=’0’

IVSUPPLY

Supply current

µA

BBCResOff=’0’

BBCResOff=’1’

0.5

BBCPwrSave=’1’; backup battery

full.

Table 34. Backup Battery Charger Register

Addr: 38

Backup Battery Charger

This register controls the Backup battery charger mode

Bit

Bit Name

Default Access

Description

1:0

BBCMode

00b

R/W

00b

Backup battery charger is disabled

01b

Backup battery charger is enabled in states “Power

Off mode”, “standby mode” and “Active mode”.

(32kHz OSC has to be enabled in that mode

rtcmode=01b or 10b)

1Xb

Backup battery charger is enabled in state “Active

mode” and “standby mode”. (32kHz OSC has to be

enabled in that mode rtcmode=01b or 10b)

BBCResOff

R/W

Enable output resistor

Bypass output resistor

4:3

BBCCur

00b

R/W

This value determines the charge current IBBC.

00b

IBBC=50µA

10b

IBBC=200µA

01b

IBBC=100µA

11b

IBBC=400µA

Digital

Control

VSUPPLY

VBACK

Voltage limited

Current source

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