LP3971 datasheet(33/52 Pages) TI1

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LP3971

www.ti.com

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

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

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

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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