Coordinated circuit for supplying power from a D-C source to a m

Details Coordinated circuit for supplying power from a D-C source to a m Coordinated circuit for supplying power from a D-C source to a m

1986-08-05

1991-12-03

Shoop, Jr., William M.

Static information storage and retrieval

Powering

Data preservation

307 101, 307442, 364569, 36442404, 365226, 365229, 365227, H03K 114, G06F 1300

Patent

active

050704818

ABSTRACT:
A microcomputer (10) in a motor vehicle is supplied with regulated operating voltage through a regulator (12) and a semiconductor (11) for the microcomputer is supplied with voltage from the same vehicle battery, through a voltage divider including a Zener diode, for its chip-select input (CSA) which feeds in through a Schmitt trigger circuit such as to enable writing into the memory (11) when the voltage at that chip-select input lies between upper and lower threshold values. Capacitances connected in parallel to ground where these voltages are respectively connected to the microcomputer and semiconductor memory are so dimensioned that any data statement transfer, begun before the longest delay the microcomputer might have in detecting the voltage drop-off, can be completed in the semiconductor memory before its chip-select input disables any further writing in. In order to keep the stabilizing capacitor (C.sub.4) for the operating voltage supply for the memory down to reasonable size, a separate battery can be advantageous for that voltage supply, although this precaution is less necessary when the memory is a EPROM for recording a one-time message from a crash sensor identifying operating conditions at the beginning of a crash.

REFERENCES:
patent: 4031363 (1977-06-01), Freeman et al.
patent: 4258421 (1981-03-01), Juhasz et al.
patent: 4541050 (1985-09-01), Honda et al.
patent: 4551801 (1985-11-01), Sokol
patent: 4591782 (1986-05-01), Germer
patent: 4612623 (1986-09-01), Bazarnik
patent: 4613939 (1986-09-01), Paine
patent: 4617639 (1986-10-01), Paine
Justin Orion, "Data Protection for E.sup.2 PROMs and NVRAMs" Mar. 1984 Intel Corp., Application Note AP-165.

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