UCD9090
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SLVSA30A –APRIL 2011–REVISED AUGUST 2011
Table 5. Rail-Status Types for Boolean Logic
Rail-Status Types
POWER_GOOD
IOUT_UC_FAULT
TEMP_OT_FAULT
TEMP_OT_WARN
SEQ_ON_TIMEOUT
SEQ_OFF_TIMEOUT
TOFF_MAX_WARN_LATCH
SEQ_ON_TIMEOUT_LATCH
SEQ_OFF_TIMEOUT_LATCH
SYSTEM_WATCHDOG_TIMEOUT_LATCH
IOUT_OC_FAULT_LATCH
MARGIN_EN
MRG_LOW_nHIGH
VOUT_OV_FAULT
VOUT_OV_WARN
VOUT_UV_WARN
VOUT_UV_FAULT
TON_MAX_FAULT
TOFF_MAX_WARN
IOUT_OC_FAULT
IOUT_OC_WARN
SYSTEM_WATCHDOG_TIMEOUT
VOUT_OV_FAULT_LATCH
VOUT_OV_WARN_LATCH
VOUT_UV_WARN_LATCH
VOUT_UV_FAULT_LATCH
TON_MAX_FAULT_LATCH
IOUT_OC_WARN_LATCH
IOUT_UC_FAULT_LATCH
TEMP_OT_FAULT_LATCH
TEMP_OT_WARN_LATCH
GPO Delays
The GPOs can be configured so that they manifest a change in logic with a delay on assertion, deassertion, both
or none. GPO behavior using delays will have different effects depending if the logic change occurs at a faster
rate than the delay. On a normal delay configuration, if the logic for a GPO changes to a state and reverts back
to previous state within the time of a delay then the GPO will not manifest the change of state on the pin. In
Figure 18 the GPO is set so that it follows the GPI with a 3ms delay at assertion and also at de-assertion. When
the GPI first changes to high logic state, the state is maintained for a time longer than the delay allowing the
GPO to follow with appropriate logic state. The same goes for when the GPI returns to its previous low logic
state. The second time that the GPI changes to a high logic state it returns to low logic state before the delay
time expires. In this case the GPO does not change state. A delay configured in this manner serves as a glitch
filter for the GPO.
3ms
3ms
GPI
GPO
1ms
Figure 18. GPO Behavior When Not Ignoring Inputs During Delay
The Ignore Input During Delay bit allows to output a change in GPO even if it occurs for a time shorter than the
delay. This configuration setting has the GPO ignore any activity from the triggering event until the delay expires.
Figure 19 represents the two cases for when ignoring the inputs during a delay. In the case in which the logic
changes occur with more time than the delay, the GPO signal looks the same as if the input was not ignored.
Then on a GPI pulse shorter than the delay the GPO still changes state. Any pulse that occurs on the GPO when
having the Ignore Input During Delay bit set will have a width of at least the time delay.
Copyright © 2011, Texas Instruments Incorporated
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