Datasheet

DependencyMasks
8 910 11 12 1314 15
RAILnorGPOn
0
1
Meaning
ShutdownofthisraildoesnotshutdownRAILnorGPOn.
ShutdownofthisrailshutsdownRAILnorGPOn.
RAIL1
01 2 34 5 67
RAIL2 RAIL3RAIL4 RAIL5RAIL6 RAIL7 RAIL8GPO1 GPO2 GPO3GPO4
0 0 00
UnderVoltageThresholds
89101112131415 01234567
Vraw
0 0 00 0
RAILUV
REF
1024 V
Vraw
V
´
=
(3)
UCD9080
www.ti.com ................................................................................................................................................... SLVS692E – SEPTEMBER 2006 – REVISED MAY 2008
The DependencyMasks field in the configuration parameters defines the rail dependency masks used for rail and
GPO shutdown. This mask represents the set of other rails and GPOs that should be shut down when this rail
shuts down. Note that because only rails are monitored, the table only has entries for the shutdown of rails. In
the dependency mask itself, there are bits that allow for GPO shutdown.
The address map for these registers is as follows:
ADDRESS SIZE DEFAULT VALUE DESCRIPTION
0xE100 2 0x007F Dependency mask for rail 1
0xE102 2 0x0001 Dependency mask for rail 2
0xE104 2 0x0002 Dependency mask for rail 3
0xE106 2 0x0004 Dependency mask for rail 4
0xE108 2 0x0008 Dependency mask for rail 5
0xE10A 2 0x0010 Dependency mask for rail 6
0xE10C 2 0x0020 Dependency mask for rail 7
0xE10E 2 0x0040 Dependency mask for rail 8
The format for each register is as follows:
The UnderVoltageThresholds field in the configuration parameters specifies each rail undervoltage threshold that
is used when monitoring this rail. The address map for these registers is as follows:
ADDRESS SIZE DEFAULT VALUE DESCRIPTION
0xE110 2 0x0000 Undervoltage threshold for rail 8
0xE112 2 0x0000 Undervoltage threshold for rail 7
0xE114 2 0x0000 Undervoltage threshold for rail 6
0xE116 2 0x0000 Undervoltage threshold for rail 5
0xE118 2 0x0000 Undervoltage threshold for rail 4
0xE11A 2 0x0000 Undervoltage threshold for rail 3
0xE11C 2 0x0000 Undervoltage threshold for rail 2
0xE11E 2 0x0000 Undervoltage threshold for rail 1
The format for each register is as follows:
The voltage conversion is dependent upon the configured voltage reference, and the pullup/pulldown resistors
used on the board for each rail. The voltage reference is selected as either 2.5 V (internal) or V
CC
(external). The
formula to convert the desired rail UnderVoltageThreshold to Vraw follows:
Without external rail voltage divider:
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