Datasheet

LP3972
SNVS468K –SEPTEMBER 2006–REVISED MAY 2013 www.ti.com
Bit Access Name Description
5 R/W BPTR Bypass LDO_RTC Output Voltage to LDO3 Output Voltage Tracking
0 - LDO_RTC3 Tracking enabled
1 - LDO_RTC3 Tracking disabled, Default
4 R/W WUP3 Spare Wakeup control input
0 - Active High
1 - Active Low
3:2 R/W GPIO2 Configure direction and output sense of GPIO2 Pin
Data Code GPIO2
2h’00 Hi-Z
2h’01 Output Low
2h’02 Input
2h’03 Output high
1:0 R/W GPIO1 Configure direction and output sense of GPIO1 Pin
Data Code GPIO1
2h’00 Hi-Z
2h’01 Output Low
2h’02 Input
2h’03 Output high
OUTPUT ENABLE 3 REGISTER (OEN3) 8H’82
Bit 7 6 5 4
(1)
3 2
(1)
1 0
(1)
Designation Reserved B3EN ENFLAG B2EN Reserved L1EN
Reset Value 0 0 0 1 0 1 0 1
(1) One time factory programmable EPROM registers for default values
OUTPUT ENABLE 3 REGISTER (OEN3) 8H’82 DEFINITIONS
Bit Access Name Description
7:5 — — Reserved
4 R/W B3EN V
CC
_Buck3 Supply Output Enabled
0 = V
CC
_Buck3 Supply Output Disabled
1 = V
CC
_Buck3 Supply Output Enabled, Default
3 R/W ENFLAG Enable for Temperature Flags (BCT)
0 = Temperature Flag Disabled
1 = Temperature Flag Enabled
2 R/W B2EN V
CC
_Buck2 Supply Output Enabled
0 = V
CC
_Buck2 Supply Output Disabled
1 = V
CC
_Buck2 Supply Output Enabled, Default
1 — — Reserved
0 R/W L1EN LDO1 (MVT)Output Voltage Enable
0 = LDO1 Supply Output Disabled
1 = LDO1 Supply Output Enabled, Default
STATUS REGISTER 3 (OSR3) 8H’83
Bit 7 6 5 4 3 2 1 0
Designation BT_OK B3_OK B2_OK LDO1_OK Reserved BCT2 BCT1 BCT0
Reset Value 0 0 0 0 0 0 0 0
STATUS REGISTER 3 (OSR3) DEFINITIONS 8H’83
Bit Access Name Description
7 R BT_OK Bucks 2-3 Supply Output Voltage Status
0 - (Bucks 1-3) output voltage < 90% Default value
1 - (Bucsk 1-3) output voltage > 90% Default value
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