LP3971 datasheet(21/42 Pages) NSC

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2C Register Definitions (Continued)

SYSTEM CONTROL REGISTER (SCR2) 8h’0E

Bit

3210

Designation

BBCS

SEB2

BPTR

WUP3_

sense

GPIO2

GPIO1

Reset Value

0000

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 = Disabled RTC_LDO1 Tracking enabled

1 = Enabled RTC-LDO1 Tracking disabled

R/W

WUP3_

sense

Spare Wakeup control input

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

LP3971 Datasheet(PDF) 21 Page - National Semiconductor (TI)

LP3971 Datasheet(HTML) 21 Page - National Semiconductor (TI)

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