LP3907 datasheet(34/57 Pages) TI1

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LP3907

SNVS511N – JUNE 2007 – REVISED AUGUST 2011

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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

—

Data

0 – Buck 1-2

0 – LDO 1-2

0 – LDO2 Not

0 – LDO1 Not

Reserve

0 – Buck2 Not

Reserve

0 – Buck1 Not

Not Valid

Valid

1 – Bucks Valid

1 – LDOs Valid

1 – LDO2 Valid

1 – LDO1 Valid

1 – Buck2 Valid

1 – Buck1 Valid

Reset

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

Buck2 Voltage Ramp

Reserved

Buck1 Target Voltage

Buck1 Voltage Ramp

Select

CTRL

Select

CTRL

0 – B2VT1

0 – Hold

0 – B1VT1

0 – Hold

1 – B2VT2

1 – Ramp to B2VS

1 – B1VT2

1 – Ramp to B1VS

selection

Reset

BUCK1 TARGET VOLTAGE 1 REGISTER (B1TV1) – 0X23

This register allows the user to program the output target voltage of Buck1.

D7-5

D4-0

Name

—

BK1_VOUT1

Access

—

R/W

Data

Reserved

Buck1 Output Voltage (V)

5’h00

Ext Ctrl

5’h01

0.80

5’h02

0.85

5’h03

0.90

5’h04

0.95

5’h05

1.00

5’h06

1.05

5’h07

1.10

5’h08

1.15

5’h09

1.20

5’h0A

1.25

5’h0B

1.30

5’h0C

1.35

5’h0D

1.40

5’h0E

1.45

5’h0F

1.50

5’h10

1.55

5’h11

1.60

5’h12

1.65

5’h13

1.70

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