SC905A View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SC905A' PDF : 23 Pages View PDF
SC905A
POWER MANAGEMENT
Register Map
Register Name
Register
Address
VPAD
0
Bit 7
DSB(1 )
1
0
Default User
State State
VCORE
1
X
VMOT
2
VMOT _EN
VANA /VCAM
3
VTCXO /VRX
4
VPLL /VTX
5
ON/OFF
6
CONTROL
ACTIVE(2 )
7
SHUTDOWN
STATUS
8
(READ ONLY)
1
0
ON
OFF
VANA2
X
X
VPAD _EN
1
0
ON OFF
VPAD
Active SHDN
1
0
ON
OFF
X
Bit 6
X
X
VMOT
Active SHDN
1
0
ON
OFF
VANA1
VRX2
VTX2
VCORE_EN
1
0
ON
OFF
VCORE
Active SHDN
1
0
ON
OFF
X
Bit 5
X
X
X
VANA0
VRX1
VTX1
VANA_EN
1
0
ON OFF
VANA
Active SHDN
1
0
ON
OFF
X
Bit 4
VPAD 4
VCORE4
VMOT4
VCAM4
VRX0
VTX0
VCAM_EN
1
0
ON OFF
VCAM
Active SHDN
1
0
ON
OFF
X
Bit 3
VPAD 3
Bit 2
VPAD 2
VCORE3
VMOT 3
VCORE2
VMOT2
VCAM 3
VCAM2
X
VTCXO 2
X
VPLL2
VTCXO _EN
VPLL_EN
1
0
1
0
ON OFF ON OFF
VTCXO
Active SHDN
1
0
ON
OFF
VPLL
Active SHDN
1
0
ON
OFF
OTF
1
0
EN_MOT
1
0
OK FAULT ON
OFF
Bit 1
VPAD 1
VCORE1
VMOT1
VCAM1
VTCXO 1
VPLL1
VTX_EN
1
0
ON OFF
VTX
Active SHDN
1
0
ON
OFF
X
Bit 0
VPAD 0
VCORE0
VMOT 0
VCAM 0
VTCXO 0
VPLL0
VRX_EN
1
0
ON
OFF
VRX
Active SHDN
1
0
ON
OFF
EN_TCXO
1
0
ON OFF
Defaults are indicated in BOLD.
SC905A Slave Address:
DEVICE ADDRESS
R/W
0
0
0
1
0
0
0
X
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
cannot be set to one through the I2C interface. When changing the VPAD control voltage, always write to register 0 with bit seven high. Set bit
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.
© 2006 Semtech Corp.
13
www.semtech.com
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