Computer system with power control circuit

• US 4,365,290 A
• Filed: 03/12/1979
• Issued: 12/21/1982
• Est. Priority Date: 03/12/1979
• Status: Expired due to Term

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Barthel, Thomas C., Nelms, George E., Bergland, William J.
• Primary Examiner(s): Shaw, Gareth D.
• Assistant Examiner(s): Chan, Eddie P.
• Application Number:
  US06/019,625
• Time in Patent Office: 1,380 Days
• Field of Search: 364/200 MS File, 364/900 MS File, 364/707, 365/226, 365/227, 128/419 P
• US Class Current: 713/321
• CPC Class Codes: A61N 1/365 controlled by a physiological parameter, e.g. heart potential evoked response A61N1/371
• CPC Class Codes: A61N 1/37247 User interfaces, e.g. input or presentation means

Abstract

A digital computer system is described as comprising an input data circuit, a processor for executing a program stored in a memory to process the inputted data, a depletable energy source (e.g., a battery) for energizing the elements of the computer system, and a power control circuit for selectively controlling the drain imposed upon the energy source in accordance with the data input into the system and the program executed by the processor. In an illustrative embodiment of this invention, the power control circuit is operative in at least three modes of operation, namely off/rest, power down, and operating. In the off/rest mode, the power control circuit imposes a minimum power drain upon the depletable energy source. An operator may manipulate a switch or actuation means to apply a transition signal to the power control, whereby the computer system is disposed from its off/rest mode to its power down mode. In the power down mode, the control circuit applies power at an intermediate level to the data input means. In an illustrative embodiment of this invention, the data input means includes a keyboard and a decoder for providing a signal indicative that one of the keys has been depressed. Upon actuation of the key, a data available signal DA is transmitted to the power control circuit, whereby the computer system is disposed in its operating mode, wherein all of the elements of the computer system are energized at a high power level. In its operating mode, the processor and its memory are fully energized to execute the stored program.

Claims

1. A computer system energized by a depletable energy source coupled to selectively energize the elements of said computer system, said computer system operable in an off/rest mode, a power down mode, and an operating mode, comprising:

(a) data input means for entering data into said computer system;

(b) decoding means coupled to said data input means and operable in the power down mode for decoding data received from said data input means and for providing a data available manifestation indicative of the availability of decoded data;

(c) actuatable means for providing upon actuation a transition manifestation;

(d) memory means for storing a program;

(e) processor means energized in its operating mode for executing the program to process the decoded data derived from said decoding means; and

(f) power control means coupled to said actuatable means and to said depletable energy source for variously energizing the elements of said computer system in its off/rest mode at a low power level, its power down mode at an intermediate power level, and its operating mode at a high power level, said power control means comprising a storage element continuously energized by said depletable energy source and responsive to the transition manifestation of said actuatable means to dispose said computer system from its off/rest mode to its power down mode wherein said decoding means is energized by said depletable energy source, said power control means coupled to said decoding means and responsive to the data available manifestation to dispose said computer system from its power down to its operating mode, wherein said processor means is energized to execute the stored program.

2. The computer system as claimed in claim 1, wherein said data input means comprises a key board of plurality of actuatable keys.

3. The computer system as claimed in claim 2, wherein said decoding means is responsive to the actuation of a key of said key board to generate and apply its data available manifestation to said power control means, whereby said power control means disposes said computer system from its power down mode to its operating mode.

4. The computer system as claimed in claim 1, wherein said computer system further comprises display means for providing an indication of the operation of said computer system, said display means being de-energized in said off/rest mode and being energized in said power down and operating modes.

5. The computer system as claimed in claim 1, wherein there is included energy source checking means being coupled to said depletable energy source to determine its power output level, said processor means operative to compare the energy source level with a predetermined minimum level below which said computer system may not operate and if below said minimum level, said power control means disposing said computer system to its off/rest mode.

6. The computer system as claimed in claim 2, wherein said decoding means is responsive to the closing of a key of said keyboard, said power control means coupled to said decoding means for determining whether one of said keys is inadvertently closed and if so, for disposing said computer system from its power down to its off/rest mode.

7. The computer system as claimed in claim 1, wherein the program stored within said memory being designed to receive and process data from said input data means in a predetermined sequence, said processor means responsive to data inputted from said data input means to compare the inputted data with that data that may be accepted at a point in the execution of said program and if not acceptable, providing a manifestation to said power control means, whereby said power control means is disposed from its operating mode to its power down mode.

8. The computer system as claimed in claim 7, wherein said data input means comprises a keyboard including a plurality of actuatable keys, said decoding means responsive to the actuation of a key to provide a manifestation of the depressed key, said processor means coupled to said decoder means to determine whether the depressed key is acceptable and if not for applying said manifestation to said power control means, whereby computer system is disposed from its operating mode to its off/rest mode.

9. The computer system as claimed in claim 8, wherein said memory stores a truth table identifying the acceptable keys that may be depressed.

10. The computer system as claimed in claim 9, wherein said processor means is responsive to the actuation of one or more keys to provide a manifestation of the value of the inputed data and comparing the value manifestation with acceptable values that may be input into said computer system, said processor means responsive to an unacceptable value for providing an error manifestation to said power control means to dispose said computer system from its operating mode to its power down mode.

11. The computer system as claimed in claim 1, wherein said computer system is further operable in a transmit mode, said processor means operable in its operating mode for executing the program to process the data to be transmitted and thereafter for providing a transmit ready manifestation to initiate the transmit mode, said depletable energy source includes first and second batteries, said power control means comprising switch means normally disposed in a first position connecting said first and second batteries in parallel with each other to provide a first voltage signal of a first relatively low magnitude, and disposable to a second position to connect said first and second batteries in a series configuration to provide a second voltage signal of a second relatively high level, said power control means responsive to the transmit ready manifestation for disposing said computer system to its transmit mode, wherein at least one element of said computer system is energized by the second voltage signal.

12. The computer system as claimed in claim 11, wherein said computer system comprises transmitter means periodically operable to transmit signals to a distant location, said processor responsive to the operation of said transmitter to provide a manifestation to said power control circuit to dispose said switch means from its first to its second position, to supply the second voltage signal to said transmitter means.

17. The computer system as claimed in claim 1, wherein there is further included amplifier means for amplifying input analog signals and operable in the power down mode as well as in the operating mode to permit a stabilization of said amplifier means during the power down mode, said amplifier means coupled to said processor means for stably amplifying and applying during the operating mode analog input signals to said processor means.

18. The computer system as claimed in claim 1, wherein said processor means executes the program stored in said memory means to provide corresponding output signals, said computer systems further including latch means coupled to receive the output signals and being responsive to selected of the output signals for providing a transfer manifestation, said power control system coupled to said latch means and responsive to the transfer manifestation for disposing said computer system from its operating mode to its power down mode.

19. The computer system as claimed in claim 1, wherein said processor means executes the program stored in said memory means to provide corresponding output signals, said computer systems further including latch means coupled to receive the output signals and being responsive to selected of the output signals for providing a transfer manifestation, said power control system coupled to said latch means and responsive to the transfer manifestation for disposing said computer system from its operating mode to its off/rest mode.

20. The computer system as claimed in claim 18, wherein said processor means includes means for providing a manifestation of the value of the data input by said data input means and for comparing the value manifestation with acceptable values that may be input into said computer system and, if not acceptable, for providing an error manifestation, said latch means responsive to the error manifestation for providing its transfer manifestation.

21. The computer system as claimed in claim 19, wherein said data input means comprises a keyboard including a plurality of actuatable keys, said decoder means responsive to the actuation of a key to provide a manifestation of the depressed key, said processor means comprising means responsive to the key manifestation to determine whether the depressed key is acceptable, and, if not, for providing an error manifestation, said latch means responsive to the error manifestation to provide its transfer manifestation.

22. The computer system as claimed in claim 18, wherein the program comprises a series of steps including a final step, said processor means executing the series of steps and for providing an end of sequence manifestation upon the execution of the final step, said latch means responsive to the end of sequence manifestation for providing its transfer manifestation.

13. Programming apparatus energized by a depletable energy source for programming a pacemaker as to its operation to control the application of its stimulating pulses to a patient'"'"'s heart, the depletable energy source coupled to selectively energize the elements of said apparatus, said apparatus operable in an off/rest mode, a power down mode, an operating mode, and a transmitting mode, said pacemaker including memory means for receiving and storing signals indicative of its operation, and generator means responsive to the stored signals for providing corresponding stimulating pulses to the patient'"'"'s heart, said programming apparatus comprising:

(a) a keyboard comprising a plurality of actuable keys for receiving and entering by operator manipulation data indicative of the pacemaker'"'"'s operation in which to program said pacemaker;

(b) decoder means coupled to said keyboard and responsive to the actuation of a key of said keyboard to provide a manifestation of the actuated key and a data available manifestation;

(c) actuatable means for initiating upon actuation the operation of said programming apparatus;

(d) memory means for storing a program;

(e) processor means for executing said program to process the manifestation indicative of the actuated key derived from said decoder means and after processing the actuated key manifestation to provide a transmit ready manifestation;

(f) transmitter means operable in the transmitting mode for transmitting the processed operation data to said pacemaker; and

(g) power control means coupled to said actuatable means and to the depletable energy source for variously energizing the elements of said programming apparatus in its off/rest mode at a low power level and a low voltage level, its power down mode at an intermediate power level and the low voltage level, its operating mode at a high power level and a low voltage level, and its transmitting mode at a high power level and a high voltage level, said power control means comprising a storage element continuously energized by said energy source and responsive to the actuation of said actuatable means to dispose said programming apparatus from its off/rest mode to its power down mode wherein said decoder means is energized by the energy source, said power control means coupled to said decoder means and responsive to the data available manifestation of said energized decoder means for disposing said programming apparatus from its power down to its operating mode, wherein said processor means is energized to execute the stored program, said power control means coupled to said processor means and responsive to the transmit ready manifestation for operating said computer system in its transmitter mode and for applying the high voltage level to said transmitter means.

14. The programming apparatus as claimed in claim 13, wherein there is included energy source checking means adapted to be coupled to said depletable energy source to determine its power output level, said processor means operative to compare the energy source level with a predetermined minimum level below which said programming apparatus may not operate and if below said minimum level, said power control means disposing said programming apparatus to its off/rest mode.

15. The programming apparatus as claimed in claim 13, wherein the program stored within said memory being designed to receive and process data from said input data in a predetermined sequence, said processor means responsive to data inputted from said decoder means to compare the inputted data with that data that may be accepted at a point in the execution of said program and if not acceptable, providing an error manifestation to said power control means, whereby said programming apparatus is disposed from its operating mode to its power down mode.

16. The programming apparatus as claimed in claim 15, wherein said processor means is coupled to said decoder means to determine whether the depressed key is acceptable and if not for applying said error manifestation to said power control means, whereby computer system is disposed from its operating mode to its off/rest mode.