LP3971 Datasheet, PDF (27/57 Pages) National Semiconductor (TI) – POWER MANAGEMENT UNIT FOR ADVANCED APPLICATION PROCESSORS

LP3971
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Bit
Access
1
—
0
R/W
Name
—
B1EN
Reserved
V_CC_Buck1 Supply Output Enabled
0 = V_CC_Buck1 Supply Output Disabled
1 = V_CC_Buck1 Supply Output Enabled
SNVS432U – JANUARY 2006 – REVISED OCTOBER 2008
Description
BUCK STATUS REGISTER (BOVSR) 8H'11
Bit
7
6
5
4
3
2
1
0
Designation
BT_OK
Reserved
Reserved B3_OK
Reserved
B2_OK
B1_OK
Reset Value
0
0
0
0
0
0
0
0
BUCK STATUS REGISTER (BOVSR) 8H'11 DEFINITIONS
Bit
Access
7
R
6:5
—
4
R
3
—
2
R
1
—
0
R
Name
BT_OK
—
B3_OK
—
B2_OK
—
B1_OK
Description
Buck 1–3 Supply Output Voltage Status
0 = (Buck 1–3) output voltage <90% Default value
1 = (Buck 1–3) output voltage >90% Default value
Reserved
Buck 3 Supply Output Voltage Status
0 = (Buck 3) output voltage <90% Default value
1 = (Buck 3) output voltage >90% Default value
Reserved
Buck 2 Supply Output Voltage Status
0 = (Buck 2) output voltage <90% Default value
1 = (Buck 2) output voltage >90% Default value
Reserved
Buck 1 Supply Output Voltage Status
0 = (Buck 1) output voltage <90% Default value
1 = (Buck 1) output voltage >90% Default value
LDO OUTPUT VOLTAGE ENABLE REGISTER (LDOEN) 8H'12
Bit
Designation
Reset Value
7
L5EC**
0**
6
L4EC**
0**
5
LDO5_EN
1
4
LDO4_EN
1
3
LDO3_EN
1
2
LDO2_EN
1
1
LDO1_EN
1
0
Reserved
0
LDO OUTPUT VOLTAGE ENABLE REGISTER (LDOEN) 8H'12 DEFINITIONS
Bit
Access
Name
Description
7
R/W
L5EC
Connects LDO5 enable to SYS_EN or PWR_EN Logic Control pin
0 = LDO 5 enable connected to PWR_EN
1 = LDO 5 enable connected to SYS_EN
6
R/W
L4EC
Connects LDO4 enable to SYS_EN or PWR_EN Logic Control pin
0 = LDO 4 enable connected to PWR_EN
1 = LDO 4 enable connected to SYS_EN
5
R/W
LDO5_EN LDO_5 Output Voltage Enable
0 = LDO5 Supply Output Disabled
1 = LDO5 Supply Output Enabled
4
R/W
LDO4_EN LDO_4 Output Voltage Enable
0 = LDO4 Supply Output Disabled
1 = LDO4 Supply Output Enabled
3
R/W
LDO3_EN LDO_3 Output Voltage Enable
0 = LDO3 Supply Output Disabled
1 = LDO3 Supply Output Enabled
2
R/W
LDO2_EN LDO_2 Output Voltage Enable
0 = LDO2 Supply Output Disabled
1 = LDO2 Supply Output Enabled
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