English
Language : 

UCD9240_17 Datasheet, PDF (27/39 Pages) Texas Instruments – Digital PWM System Controller
◁
UCD9240
www.ti.com................................................................................................................................................... SLUS766C – JULY 2008 – REVISED NOVEMBER 2008
GPIO_SEQ_CONFIG allows the configuration of fault relationships such that a fault on one rail can result in the
shut down of any selection of rails in addition to the rail at fault. These fault interactions are not constrained to a
single master/slave relationship; for example, a system can be configured such that a fault on any rail shuts
down all rails. If the fault response of the failing rail is to shut down immediately, all dependent rails follow suit
and shuts down immediately regardless of their programmed response code.
Each rail can be optionally configured to monitor a sequencing input pin for a specified period of time after it
turns on and reaches its power good threshold. If the programmable timeout is reached before the input pin state
matches its defined logic level, the rail is shut down, and a status error posted. This feature could be used, for
example, to ensure that an LDO on the board did turn on when the main system voltage came up. Each rail is
enabled independently of the other rails and has a unique timeout value; a single input pin is used as the timeout
source.
The setup of the GPIO_SEQ_CONFIG command is aided by the use of the Fusion Digital Power™ Designer,
which graphically displays relationships between rails and provides intuitive controls to allocate and configure
available resources.
The following pins are available for use as GPIO or sequencing control, provided they are not being used for
their primary purpose:
PIN NAME
DPWM-1A
DPWM-1B
DPWM-2A
DPWM-2B
DPWM-3A
DPWM-3B
DPWM-4A
DPWM-4B
80-PIN
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
64-PIN
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
–
IN/OUT
–
FAULT-1A
FAULT-1B
FAULT-2A
FAULT-2B
FAULT-3A
FAULT-3B
FAULT-4A
FAULT-4B
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
–
IN/OUT
–
SRE-1A
SRE-1B
SRE-2A
SRE-2B
SRE-3A
SRE-3B
SRE-4A
SRE-4B
POWER_GOOD
FAN_TACH
FAN_PWM
DIAG_LED
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN (1)
IN (1)
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
–
IN/OUT
–
IN/OUT
IN/OUT
IN (1)
–
(1) The FAN_PWM and Diag_LED pins are outputs when configured for their primary purpose. When
configured for sequencing, they may be used only as inputs.
Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): UCD9240
Submit Documentation Feedback
27
 ▷