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Differences between UCD9240 and UCD9248

EDGAR BROWN
Intellectual 450 points
Other Parts Discussed in Thread: UCD9248, UCD9240, UCD9224

Can anyone tell me what are the differences between an UCD9240 and an UCD9248 system controllers?

The pin-outs are nearly identical (save for 2 pins), and one seems to be just a later silicon revision of the other (e.g., the UCD9248 does not seem to have the open drain bug).

Is there anything else beyond that?

Are there other equivalent devices out there?

  • 0
    TI__Intellectual 1755 points

    Edgar,
    The UCD9240 and the UCD9248, share the same silicon hardware. The difference is in the firmware loaded into the ARM core. The newer UCD9248 has substantially improved sequencing capability, and numerous bug fixes over the UCD9240. To improve sequencing control, the UCD9224/46/48 devices allow you to define a digital I/O pin as a turn-on dependency or a stay-on dependency. (The same dependencies can be defined internally between rails controlled by a single device without needing to allocate a device pin.) This split between turn-on dependencies and stay-on dependencies allows many more start-up and shut-down sequencing options, such as:  start rail #1, then #2, then #3, then #4, then #5. Then stop in the opposite order:  rail #5, then rail#4, ... rail #1.  It also allows a cleaner way of making a fault on one rail shut-down all the other rails.

    To make room for the enhanced sequencing function, the UCD9248 does not provide fan control.