Datasheet

UCD90124A

www.ti.com

SLVSAN8 –JANUARY 2012

or disabled

• Other rails to turn off in case of a fault on a rail (fault-shutdown slaves)

Figure 5. Fusion GUI V

OUT

-Config Tab

The Synchronize margins/limits/PG to Vout checkbox is an easy way to change the nominal operating voltage

of a rail and also update all of the other limits associated with that rail according to the percentages shown to the

right of each entry.

The plot in the upper left section of Figure 5 shows a simulation of the overall sequence-on and sequence-off

configuration, including the nominal voltage, the turnon and turnoff delay times, the power-good on and

power-good off voltages and any timing dependencies between the rails.

After a rail voltage has reached its POWER_GOOD_ON voltage and is considered to be in regulation, it is

compared against two UV and two OV thresholds in order to determine if a warning or fault limit has been

exceeded. If a fault is detected, the UCD90124A responds based on a variety of flexible, user-configured options.

Faults can cause rails to restart, shut down immediately, sequence off using turnoff delay times or shut down a

group of rails and sequence them back on. Different types of faults can result in different responses.

Fault responses, along with a number of other parameters including user-specific manufacturing information and

external scaling and offset values, are selected in the different tabs within the Configure function of the Fusion

GUI. Once the configuration satisfies the user requirements, it can be written to device SRAM if Fusion GUI is

connected to a UCD90124A using an I

C/PMBus. SRAM contents can then be stored to data flash memory so

that the configuration remains in the device after a reset or power cycle.

Product Folder Link(s) :UCD90124A