LP3971 datasheet(20/42 Pages) NSC

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2C Register Definitions (Continued)

BACKUP BATTERY CHARGER CONTROL REGISTER (BBCC) 8h’0B

Bit

Designation

NBUB

CNBFL

nBFLT

BUCEN

IBUC

Reset Value

BACKUP BATTERY CHARGER CONTROL REGISTER (BBCC) 8h’0B DEFINITIONS

Bit

Access

Name

Description

R/W

NBUB

No back-up battery default setting. Logic will not allow switch over to back-up battery.

0 = Back up Battery Enabled

1 = Back up Battery Disabled

R/W

CNBFL

Control for nBATT_FLT output signal

0 = nBATT_FLT Enabled

1 = nBATT_FLT Disabled

5:3

R/W

BFLT

nBATT_FLT monitors the battery voltage and can be set to the De-assert voltages listed

below.

Data Code

Asserted

De-Asserted

3h’00

2.4

2.6

3h’01

2.6

2.8

3h’02

2.8

3.0

3h’03

3.0

3.2

3h’04

3.2

3.4

3h’05

3.4

3.6

R/W

BUCEN

Enables backup battery charger

0 = Back up Battery Charger Disabled

1 = Back up Battery Charger Enabled

1:0

R/W

IBUC

Charger current setting for back-up battery

Data Code

BU Charger I (µA)

2h’00

260

2h’01

190

2h’02

325

2h’03

390

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