LP3971 datasheet(25/52 Pages) TI1

25 / 52 page

LP3971

www.ti.com

SNVS432V – JANUARY 2006 – REVISED MAY 2013

Bit

Access

Name

Description

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

SYSTEM CONTROL REGISTER (SCR2) 8H'0E

Bit

Designation

BBCS

SEB2

BPTR**

WUP3_

GPIO2

GPIO1

sense

Reset Value

0**

SYSTEM CONTROL REGISTER (SCR2) 8H'0E DEFINITIONS

Bit

Access

Name

Description

R/W

BBCS

Sets GPIO1 as control input for Back Up battery charger

0 = Back Up battery Charger GPIO Disabled

1 = Back Up battery Charger GPIO Pin Enabled

R/W

SEB2

PWR_EN soft Low voltage Supply Enabled OR'ed with PWR_EN Pin

0 = Low voltage Supply Output Enabled

1 = Low voltage Supply Output Disabled

R/W

BPTR

Bypass RTC_LDO Output Voltage to LDO1 Output Voltage Tracking

0 = RTC_LDO1 Tracking enabled

1 = RTC-LDO1 Tracking disabled

R/W

WUP3_

Spare Wakeup control input

sense

0 = Active High

1 = Active Low

3:2

R/W

GPIO2

Configure direction and output sense of GPIO2 Pin

Data Code

GPIO2

2h'00

Hi-Z

2h'01

Output Low

2h'02

Input

2h'03

Output high

1:0

R/W

GPIO1

Configure direction and output sense of GPIO1 Pin

Data Code

GPIO1

2h'00

Hi-Z

2h'01

Output Low

2h'02

Input

2h'03

Output high

BUCKS OUTPUT VOLTAGE ENABLE REGISTER (BOVEN) 8H'10

Bit

Designation

Reserved

B2ENC**

Reserved

B3EN

Reserved

B2EN

Reserved

B1EN

Reset Value

1**

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