LP3972 datasheet(26/59 Pages) NSC

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2C Compatible Interface (Continued)

OUTPUT VOLTAGE ENABLE REGISTER 2

This 8 bit output register enables and disables the output voltages on the LDO 2,3,4 supplies.

Output Voltage Enable Register 2 (OVER2) 8h’12

Bit

4**

3**

2**

Designation

Reserved

LDO4_EN

LDO3_EN

LDO2_EN

Reserved

Reset Value

Note: ** denotes one time factory programmable EPROM registers for default values

Output Voltage Enable Register 2 (OVER2) 8h’12 Definitions

Bit

Access

Name

Description

—

Reserved

—

Reserved

—

Reserved

R/W

LDO4_EN

LDO_4 Output Voltage Enable

0 = LDO4 Supply Output Disabled, Default

1 = LDO4 Supply Output Enabled

R/W

LDO3_EN

LDO_3 Output Voltage Enable

0 = LDO3 Supply Output Disabled, Default

1 = LDO3 Supply Output Enabled

R/W

LDO2_EN

LDO_2 Output Voltage Enable

0 = LDO2 Supply Output Disabled, Default

1 = LDO2 Supply Output Enabled

—

Reserved

—

Reserved

OUTPUT VOLTAGE ENABLE REGISTER 2

Output Voltage Status Register 2 (OVSR2) 8h’13

Bit

Designation

LDO_OK

N/A

LDO4_OK

LDO3_OK

LDO2_OK

N/A

Reset Value

Output Voltage Status Register 2 (OVSR2) 8h’13 Definitions

Bit

Access

Name

Description

LDO_OK

LDO 2-4 Supply Output Voltage Status

0 - (LDO 2-4) output voltage < 90% of selected value

1 - (LDO 2-4) output voltage > 90% of selected value

—

Reserved

—

Reserved

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

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

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

—

Reserved

—

Reserved

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