SC905EVB View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SC905EVB' PDF : 21 Pages View PDF
SC905
POWER MANAGEMENT
Register Map
Register Name
VPAD
Register
Address
0
Bit 7
DSB(1)
1
0
Default User
State State
VCORE
1
X
Bit 6
X
X
Bit 5
X
Bit 4
VPAD4
Bit 3
VPAD3
Bit 2
VPAD2
Bit 1
VPAD1
Bit 0
VPAD0
X
VCORE4
VCORE3
VCORE2
VCORE1
VCORE0
VMOT
2
VMOT_EN
VMOT
X
Active SHDN
1
0
1
0
ON OFF ON
OFF
VMOT4
VMOT3
VMOT2
VMOT1
VMOT0
VANA/VCAM
3
VANA2
VANA1
VANA0
VCAM4
VCAM3
VCAM2
VCAM1
VCAM0
VTCXO/VRX
4
VPLL/VTX
5
ON/OFF
6
CONTROL
X
X
VPAD_EN
1
0
VRX2
VTX2
VCORE_EN
1
0
VRX1
VTX1
VANA_EN
1
0
VRX0
VTX0
VCAM_EN
1
0
X
X
VTCXO_EN
1
0
VTCXO2
VPLL2
VPLL_EN
1
0
VTCXO1
VPLL1
VTX_EN
1
0
VTCXO0
VPLL0
VRX_EN
1
0
ACTIVE(2)
7
SHUTDOWN
ON OFF
VPAD
Active SHDN
1
0
ON
OFF
ON OFF
VCORE
Active SHDN
1
0
ON
OFF
ON OFF
VANA
Active SHDN
1
0
ON
OFF
ON OFF
VCAM
Active SHDN
1
0
ON
OFF
ON OFF
VTCXO
Active SHDN
1
0
ON
OFF
ON OFF
VPLL
Active SHDN
1
0
ON
OFF
ON OFF
VTX
Active SHDN
1
0
ON
OFF
ON OFF
VRX
Active SHDN
1
0
ON
OFF
STATUS
8
X
X
X
X
OTF
FAULTB
CHRGB
CPB
(READ ONLY)
1
0
1
0
1
0
1
0
OK FAULT OK FAULT OFF ON OFF ON
Defaults are indicated in BOLD.
SC905 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 SC905 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 applica-
tions 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
Share Link: 
