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28335 flash reliability

Clark Molster
Expert 5415 points

Other Parts Discussed in Thread: TMS320F28335

This is a gentle query from one of our fine customers.  Can anyone comment?

<begin>

Referring to the data manual for the TMS320F28335 (TI Literature Number: SPRS439F revised April 2009, page 120 section 6.8 #2), "During power down, the XRS_ pin must be pulled low at least 8 us prior to Vdd reaching 1.5V. This is to enhance flash reliability." 

What does this mean? If you don't pull the pin low in time does it mean that your internal flash is subject to corruption? Or does it mean that the cycle lifetime of the flash will be reduced, but until the (reduced) lifetime expires it will be fine? Or what?

Can you clarify?

Hope things are good at TI.

<end>

Cheers,

Clark Molster

  • 0
    TI__Expert 8500 points

    Clark,

    The flash circuits (as all circuits do) will begin to fail at low voltages. To ensure avoidance of a potential condition where, during power down, one of the flash pump programming/erase voltages gets passed on to a flash bit and slightly programs/erases the bit, it is important to put the flash into a reset condition before the voltage is too low. Repeated exposure to this potential condition could lead to corruption of the flash bit.

    Regards,
    Dave Foley