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POWER MANAGEMENT

SC905A

SC905A Slave Address:

Defaults are indicated in BOLD.

Notes:

(1) The default status bit (DSB) is set to 1 only when the SC905A is enabled by either the HFPWR pin or the ON pin being pulled high, and it

seven low only when the DSB is to be cleared by the MSM. This will prevent any software race condition in a multi-tasking environment. See the

applications section for more information on using the DSB.

(2) The Active Shutdown defaults ON at power-up, but the registers maintain their settings as the LDOs are enabled and disabled during normal

operation.

DEVICE ADDRESS

R/W

000100

0

X

Register Map

Register Name

Register

Address

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default

State

VPAD

VCORE

VMOT

VANA /VCAM

VTCXO/VRX

VPLL /VTX

ON/OFF

CONTROL

ACTIVE

(2 )

SHUTDOWN

STATUS

(READ ONLY)

0

1

2

3

4

6

5

7

8

DSB

(1 )

1

0

User

State

X

X

VPAD 4

VPAD 3

VPAD 2

VPAD 1

VPAD 0

XX

X

VCORE4

VCORE3

VCORE2

VCORE1

VCORE0

X

VMOT_EN

VMOT

Active SHDN

VMOT4

VMOT3

VMOT2

VMOT1

VMOT0

10

10

OFF

OFF

ON

ON

VANA2

VANA1

VANA0

VCAM4

VCAM 3

VCAM2

VCAM1

VCAM 0

VTCXO2

VTCXO1

VTCXO0

VRX2

VRX1

VRX0

VPLL2

VPLL1

VPLL0

VTX2

VTX1

VTX0

X

X

X

X

VPAD _EN

10

OFF

ON

VCORE_EN

10

OFF

ON

VANA_EN

10

OFF

ON

VCAM_EN

10

OFF

ON

VTCXO_EN

10

OFF

ON

VPLL_EN

10

OFF

ON

VTX_EN

10

OFF

ON

VRX_EN

10

OFF

ON

VPAD

Active SHDN

10

OFF

ON

VCORE

Active SHDN

10

OFF

ON

VANA

Active SHDN

10

OFF

ON

VCAM

Active SHDN

10

OFF

ON

VTCXO

Active SHDN

10

OFF

ON

VPLL

Active SHDN

10

OFF

ON

VTX

Active SHDN

10

OFF

ON

VRX

Active SHDN

10

OFF

ON

EN_MOT

1

0

EN_TCXO

1

0

ON

OTF

10

OK

FAULT

X

X

X

X

OFF

ON

OFF

X