LP3971 Datasheet, PDF (34/57 Pages) National Semiconductor (TI) – POWER MANAGEMENT UNIT FOR ADVANCED APPLICATION PROCESSORS

LP3971
SNVS432U – JANUARY 2006 – REVISED OCTOBER 2008
Bit
Access
Name
Description
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
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LDO2–LDO1 VOLTAGE CONTROL REGISTER (L21VCR) 8H'39
Bit
Designation
Reset Value
7
6
5
4
LDO 2 Output Voltage (L20V)**
1**
1**
0**
0**
3
2
1
0
LDO 1 Output Voltage (L1OV)**
1**
1**
0**
0**
LDO2–LDO1 VOLTAGE CONTROL REGISTER (L21VCR) 8H'39 DEFINITIONS
Bit
Access
7:4
R/W
Name
L2OV
Data Code
4h'0
4h'1
4h'2
4h'3
4h'4
4h'5
4h'6
4h'7
4h'8
4h'9
4h'A
4h'B
4h'C
4h'D
4h'E
4h'F
Description
Output Voltage
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
34
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