Threshold personalization testmode

Details Threshold personalization testmode Threshold personalization testmode

2007-04-09

2010-11-02

Shingleton, Michael B (Department: 2815)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S540000, C327S143000, C327S155000, C327S535000, C257S048000, C324S765010, C341S154000

Reexamination Certificate

active

07825704

ABSTRACT:
A threshold personalization circuit for a reset or supervisor chip includes personalization fuses, which shift a resistor divider to provide a variety of selectable voltage thresholds. The personalization fuses may provide hundreds of millivolts of adjustment. The threshold personalization circuit further includes trim fuses to fine tune the threshold to within a few millivolts of the target threshold voltage. The threshold personalization circuit includes a test mode to cycle through to a particular personalization trim, such that at prelaser testing the personalized value is found (the fuse blow for personalization is emulated) and then the trim fuse amount can be based on the actual final personalized voltage. This results in very accurate threshold voltages for all personalized values.

REFERENCES:
patent: 7345611 (2008-03-01), Voicu et al.
patent: 7639067 (2009-12-01), Perisetty

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