LP3971 datasheet(33/52 Pages) TI1

Part #	LP3971

Description	Power Management Unit for Advanced Application Processors

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Manufacturer	TI1 [Texas Instruments]

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LP3971

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SNVS432V – JANUARY 2006 – REVISED MAY 2013

BUCK FUNCTION REGISTER (BFR) 8H'38 DEFINITIONS

Bit

Access

Name

Description

7:3

—

Reserved

SHBU

Shut down Back up battery to prevent battery drain during shipping

0 = Back up Battery Enabled

1 = Back up Battery Disabled

1

R

BK_SLOMOD

Buck Spread Spectrum Modulation Buck 1–3

0 = 10 kHz triangular wave spread spectrum modulation

1 = 2 kHz triangular wave spread spectrum modulation

0

R

BK_SSEN

Spread spectrum function Buck 1–3

0 = SS Output Disabled

1 = SS Output Enabled

LDO2–LDO1 VOLTAGE CONTROL REGISTER (L21VCR) 8H'39

Bit

7

6

5

4

3

2

1

0

Designation

LDO 2 Output Voltage (L20V)**

LDO 1 Output Voltage (L1OV)**

Reset Value

1**

0**

1**

0**

LDO2–LDO1 VOLTAGE CONTROL REGISTER (L21VCR) 8H'39 DEFINITIONS

Bit

Access

Name

Description

7:4

R/W

L2OV

Data Code

Output Voltage

4h'0

1.8

4h'1

1.9

4h'2

2.0

4h'3

2.1

4h'4

2.2

4h'5

2.3

4h'6

2.4

4h'7

2.5

4h'8

2.6

4h'9

2.7

4h'A

2.8

4h'B

2.9

4h'C

3.0

4h'D

3.1

4h'E

3.2

4h'F

3.3

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