LP3971 Datasheet, PDF (28/57 Pages) National Semiconductor (TI) – POWER MANAGEMENT UNIT FOR ADVANCED APPLICATION PROCESSORS

LP3971
SNVS432U – JANUARY 2006 – REVISED OCTOBER 2008
Bit
Access
Name
1
R/W
LDO1_EN LDO_1 Output Voltage Enable
0 = LDO1 Supply Output Disabled
1 = LDO1 Supply Output Enabled
0
—
—
Reserved
Description
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LDO OUTPUT VOLTAGE STATUS REGISTER (LDOVS) 8H'13
Bit
7
6
5
4
3
2
1
0
Designation LDOS_OK
N/A
LDO5_0K LDO4_OK
LDO3_OK LDO2_OK LDO1_OK
N/A
Reset Value
0
0
0
0
0
0
0
0
LDO OUTPUT VOLTAGE STATUS REGISTER (LDOVS) 8H'13 DEFINITIONS
Bit
Access
Name
Description
7
R
LDO_OK LDO 1–5 Supply Output Voltage Status
0 = (LDO 1–5) output voltage <90% of selected value
1 = (LDO 1–5) output voltage >90% of selected value
6
—
—
Reserved
5
R
LDO5_OK LDO_5 Output Voltage Status
0 = (V_CC_LDO5) output voltage <90% of selected value
1 = (V_CC_LDO5) output voltage >90% of selected value
4
R
LDO4_OK LDO_4 Output Voltage Status
0 = (V_CC_LDO4) output voltage <90% of selected value
1 = (V_CC_LDO4) output voltage >90% of selected value
3
R
LDO3_OK LDO_3 Output Voltage Status
0 = (V_CC_LDO3) output voltage <90% of selected value
1 = (V_CC_LDO3) output voltage >90% of selected value
2
R
LDO2_OK LDO_2 Output Voltage Status
0 = (V_CC_LDO2) output voltage <90% of selected value
1 = (V_CC_LDO2) output voltage >90% of selected value
1
R
LDO1_OK LDO_1 Output Voltage Status
0 = (V_CC_LDO1) output voltage <90% of selected value
1 = (V_CC_LDO1) output voltage >90% of selected value
0
—
—
Reserved
VOLTAGE CHANGE CONTROL REGISTER 1 (V_CC1) 8H'20
Bit
Designation
Reset Value
7
B3VS
0
6
B3GO
0
5
B2VS
0
4
B2GO
0
3
2
Reserved
0
0
1
B2VS
0
0
B2GO
0
VOLTAGE CHANGE CONTROL REGISTER 1 (V_CC1) 8H'20 DEFINITIONS
Bit
Access
7
R/W
6
R/W
5
R/W
4
R/W
3:2
—
Name
B3VS
B3GO
B2VS
B2GO
—
Description
Buck 3 Target Voltage Select
0 = Buck 3 Output Voltage to B3TV1
1 = Buck 3 Output Voltage to B3TV2
Start Buck 3 Voltage Change
0 = Hold Buck 3 Output Voltage at current level
1 = Ramp Buck 3 Output Voltage as selected by B3VS
Buck 2 Target Voltage Select
0 = Buck 2 Output Voltage to B2TV1
1 = Buck 2 Output Voltage to B2TV2
Start Buck 2 Voltage Change
0 = Hold Buck 2 Output Voltage at current level
1 = Ramp Buck 2 Output Voltage as selected by B2VS
Reserved
28
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