Datasheet

LP3972
www.ti.com SNVS468K –SEPTEMBER 2006–REVISED MAY 2013
System Control Register (SCR) 8h’07 Definitions
Bit Access Name Description
7-1 — — Reserved
0 R/W CLK_SCL External Clock Select
0 = Internal Oscillator clock for Buck Converters
1 = External 13 MHz Oscillator clock for Buck Converters
OUTPUT VOLTAGE ENABLE REGISTER 1
This register enables or disables the low voltage supplies LDO1 and Buck1. See details below.
Output Voltage Enable Register 1 (OVER1) 8h’10
Bit 7 6 5 4 3 2 1 0
Designation Reserved S_EN Reserved A_EN
Reset Value 0 0 0 0 0 1 0 1
Output Voltage Enable Register 1 (OVER1) 8h’10 Definitions
Bit Access Name Description
7-3 — — Reserved
2 R/W S_EN V
CC
_SRAM (LDO5) Supply Output Enabled
0 = V
CC
_SRAM (LDO5) Supply Output Disabled
1 = V
CC
_SRAM (LDO5) Supply Output Enabled
1 — — Reserved
0 R/W A_EN V
CC
_APPS (Buck1) Supply Output Enabled
0 = V
CC
_APPS (Buck1) Supply Output Disabled
1 = V
CC
_APPS (Buck1) Supply Output Enabled
OUTPUT VOLTAGE STATUS REGISTER
This 8 bit register is used to indicate the status of the low voltage supplies. By polling each of the specify
supplies is within its specified operating range.
Output Voltage Status Register 1 (OVSR1) 8h’11
Bit 7 6 5 4 3 2 1 0
Designation LP_OK Reserved S_OK Reserved A_OK
Reset Value 0 0 0 0 0 0 0 0
Output Voltage Status Register 1 (OVSR1) 8h’11 Definitions
Bit Access Name Description
7 R LP_OK Low Voltage Supply Output Voltage Status
0 - V
CC
_APPS (Buck1) & V
CC
_SRAM (LDO5) output voltage < 90% of
selected value
1 - V
CC
_APPS (Buck1) & V
CC
_SRAM (LDO5) output voltage > 90% of
selected value
6:3 — — Reserved
2 R S_OK V
CC
_SRAM Supply Output Voltage Status
0 - V
CC
_SRAM (LDO5) output voltage < 90% of selected value
1 - V
CC
_SRAM (LDO5) output voltage > 90% of selected value
1 — — Reserved
0 R A_OK V
CC
_APPS Supply output Voltage Status
0 - V
CC
_APPS (Buck1) output voltage < 90% of selected value
1 - V
CC
_APPS (Buck1) output voltage > 90% of selected value
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