LP3906 datasheet(25/38 Pages) NSC

25 / 38 page

LP3906 Control Registers (Continued)

BUCK AND LDO OUTPUT VOLTAGE ENABLE REGISTER (BKLDOEN) – 0X10

This register controls the enables for the Bucks and LDOs.

Name

—

LDO2EN

—

LDO1EN

—

BK2EN

—

BK1EN

Access

—

R/W

—

R/W

—

R/W

—

R/W

Data

Reserved

0 – Disable

1 – Enable

Reserved

0 – Disable

1 – Enable

Reserved

0 – Disable

1 – Enable

Reserved

0 – Disable

1 – Enable

Reset

BUCK AND LDO STATUS REGISTER (BKLDOSR) – 0X11

This register monitors whether the Bucks and LDOs meet the voltage output specifications.

Name

BKS_OK

LDOS_OK

LDO2_OK

LDO1_OK

—

BK2_OK

—

BK1_OK

Access RRRR

—

Data

0 – Buck 1-2

Not Valid

1 – Bucks

Valid

0 – LDO 1-2

Not Valid

1 – LDOs

Valid

0 – LDO2 Not

Valid

1 – LDO2

Valid

0 – LDO1 Not

Valid

1 – LDO1

Valid

Reserved 0 – Buck2 Not

Valid

1 – Buck2

Valid

Reserved 0 – Buck1

Not Valid

1 – Buck1

Valid

Reset

00000

BUCK VOLTAGE CHANGE CONTROL REGISTER 1 (VCCR) – 0X20

This register selects and controls the output target voltages for the buck regulators.

D7-6

D3-2

Name

—

B2VS

B2GO

—

B1VS

B1GO

Access

—

R/W

—

R/W

Data

Reserved

Buck2 Target Voltage

Select

0 – B2VT1

1 – B2VT2

Buck2 Voltage Ramp

CTRL

0 – Hold

1 – Ramp to B2VS

selection

Reserved

Buck1 Target Voltage

Select

0 – B1VT1

1 – B1VT2

Buck1 Voltage Ramp

CTRL

0 – Hold

1 – Ramp to B1VS

selection

Reset

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