Datasheet
LP3972
www.ti.com
SNVS468K –SEPTEMBER 2006–REVISED MAY 2013
Bit Access Name Description
6 R B3_OK Buck3 Supply Output Voltage Status
0 - (Buck3) output voltage < 90% Default value
1 - (Buck3) output voltage > 90% Default value
5 R B2_OK Buck2 Supply Output Voltage Status
0 - (Buck2) output voltage < 90% Default value
1 - (Buck2) output voltage > 90% Default value
4 R LDO1_OK LDO1 Output Voltage Status
0 - (V
CC
_LDO1) output voltage < 90% of selected value
1 - (V
CC
_LDO1) output voltage > 90% of selected value
3 — — Reserved
2:0 R BCT Binary coded thermal management flag status register
Temperature
Data Code Ascending °C
000 40
001 60
010 80
011 100
100 120
101 140
110 160
111 Reserved
LOGIC OUTPUT ENABLE REGISTER (LOER) 8H’84
Bit 7 6
(1)
5
(1)
4
(1)
3
(1)
2
(1)
1
(1)
0
(1)
Designation Reserved B3ENC B2ENC B1ENC L5EC L4EC L3EC L2EC
Reset Value 0 1 1 0 0 1 1 1
(1) One time factory programmable EPROM registers for default values
LOGIC OUTPUT ENABLE REGISTER (LOER) DEFINITIONS 8H’84
Bit Access Name Description
7 — — Reserved
6 R/W B3ENC Connects Buck3 enable to SYS_EN or PWR_EN Logic Control pin
0 - Buck3 enable connected to PWR_EN
1 - Buck3 enable connected to SYS_EN, Default
5 R/W B2ENC Connects Buck2 enable to SYS_EN or PWR_EN Logic Control pin
0 - Buck2 enable connected to PWR_EN
1 - Buck2 enable connected to SYS_EN, Default
4 R/W B1ENC Connects Buck1 enable to SYS_EN or PWR_EN Logic Control pin
0 - Buck1 enable connected to PWR_EN, Default
1 - Buck1 enable connected to SYS_EN
3 R/W L5EC Connects LDO5 enable to SYS_EN or PWR_EN Logic Control pin
0 - LDO5 enable connected to PWR_EN, Default
1 - LDO5 enable connected to SYS_EN
2 R/W L4EC Connects LDO4 enable to SYS_EN or PWR_EN Logic Control pin
0 - LDO4 enable connected to PWR_EN
1 - LDO4 enable connected to SYS_EN, Default
1 R/W L3EC Connects LDO3 enable to SYS_EN or PWR_EN Logic Control pin
0 - LDO3 enable connected to PWR_EN
1 - LDO3 enable connected to SYS_EN, Default
0 R/W L2EC Connects LDO2 enable to SYS_EN or PWR_EN Logic Control pin
0 - LDO2 enable connected to PWR_EN
1 - LDO2 enable connected to SYS_EN, Default
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