Method for EEPROM write protection using threshold voltage proje

Details Method for EEPROM write protection using threshold voltage proje Method for EEPROM write protection using threshold voltage proje

1991-02-25

1993-12-28

Fleming, Michael R.

Boots, shoes, and leggings

3642734, 364DIG1, 3649485, 364DIG2, 371 14, 371 66, 365228, G06F 128

Patent

active

052748278

ABSTRACT:
Writing to an EEPROM when the regulated supply voltage to the EEPROM is below a minimum voltage required for proper operation is prevented by determining the battery voltage threshold which corresponds to the minimum required supply voltage, measuring the battery voltage and the rate of change of voltage and projecting the voltage to the end of the write cycle. When the projected battery voltage is below the threshold the write cycle is canceled. The write cycle is also canceled when the battery voltage is below the normal operating range when a write cycle is requested.

REFERENCES:
patent: 4439804 (1984-03-01), Riddle et al.
patent: 4485456 (1984-11-01), Toyoda
patent: 4612632 (1986-09-01), Olson
patent: 4843592 (1989-06-01), Tsuaki et al.

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