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UCD90240 Datasheet(PDF) 28 Page - Texas Instruments

No. de pieza UCD90240
Descripción Electrónicos  UCD90240 24-Rail PMBus Power Sequencer and System Manager
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Fabricante Electrónico  TI1 [Texas Instruments]
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UCD90240 Datasheet(HTML) 28 Page - Texas Instruments

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WDI
WDO
<t
WDI
<t
WDI
<t
WDI
t
WDI
<t
WDI
UCD90240
SLVSCW0 – FEBRUARY 2015
www.ti.com
Figure 18. Pin Selected States Configuration Window (Configure
►Pin Assignment tab)
7.3.11 Watchdog Timer
UCD90240 provides a watchdog timer (WDT). The WDT can be reset by toggling a watchdog input (WDI) pin. If
WDI is not toggled within a programmed period, the WDT will time out. As a result, a watchdog output (WDO) pin
will be asserted (or generate a pulse) in order to provide a system-reset signal.
The WDI and WDO pins are GPIO pins and are only optional. The WDI can be replaced by
SYSTEM_WATCHDOG_RESET command sent over PMBus. The WDO can be manifested through the Boolean
Logic defined GPOs, or its function can be integrated into the System Reset pin configured in the System Reset
function (System Reset function will be discussed in the SYSTEM RESET FUNCTION section).
The WDT timer is programmable from 0.001s to 258.048s. See the UCD90xxx Sequencer and System Health
Controller PMBus Command Reference for details on configuring the watchdog timer.
After
a
timeout,
the
WDT
can
be
restarted
by
toggling
the
WDI
pin
or
by
writing
a
SYSTEM_WATCHDOG_RESET command over PMBus. A watchdog timing diagram is shown in Figure 19.
Figure 19. Watchdog Timer Operation Timing Diagram
The WDT can be active immediately at power up or has an initial wait time. Table 3 lists the programmable wait
times before the WDT operation begins.
Table 3. WDT Initial Wait Time
0 ms
100 ms
200 ms
400 ms
800 ms
1.6 s
3.2 s
28
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