Communication system communication device and method for determining duty ...

US007982512B2

<12) United States Patent (10) Patent N0.: US 7,982,512 B2 Misawa et al. (45) Date of Patent: Jul. 19, 2011 (54) COMMUNICATION SYSTEM (56) References Cited COMMUNICATION DEVICE AND METHOD FORDETERMDHNGDUTYRATK)OFPWMI USJJENTDOCUMENTS CONTROL 4,463,352 A 7/1984 Forbes et al. 4,546,269 A 10/1985 Johnson (75) Inventors: Katsutoyo Misawa, Nukata-gun (JP); Q izlggirat Masai" RiI"1ai= N11i<a1a-g11n(Ji’); 5:072:407 A 12/1991 Guitiz Gt 51. Toshihiko Matsuoka, Nukata-gun (JP); 5,367,541 A 11/ 1994 Barbero Hmwmimmmaxmuaaam i”l”6A» W@% Mmhms 5,526,058 A 6/1996 Sano et al. 5,949,253 A 9/ 1999 Bridgewater, Jr. 6,097,754 A 8/2000 F' h l. (73) Assignee: DENSO CORPORATION, Kariya (JP) teontinfedjt a ( * ) Notice: Subject to any disclaimer, the term of this FOREIGN PATENT DOCUMENTS patent is extended or adjusted under 35 JP A'2005'303631 10/2005 U-S-C 154(9) by 120 days OTHER PUBLICATIONS (21) App1_ NO; 12/585,673 Safe_by_Wire_Plus, Version 2.0, Sep. 24, 2004. (22) Filed, seP_ 22, 2009 Primary Examiner — Cassandra Cox (74) Attorney, Agent, or Firm — Posz Law Group, PLC (65) Prior Publication Data (57) ABSTRACT Us 2010/0017641 A1 Jan 21’ 2010 A communication system includes" a master" a plurality of Related U_s_ Application Data slaves; and a bus for coupling among the master and the _ _ _ _ _ plurality of slaves in order to communicate asynchronously (62) DIVISIOH 0fapp11cat10nN0. 11/723,434, filfi-Id On Mar. among the master and the plurality of slaves. The master 20, 2007, HOW Pat. NO. 7,631,212. supplies electricity to the bus in a power supply period. The master or the slave drives the bus for transmitting a one-bit (30) Foreign APPii¢ati°ii Priority Data data through the bus in a data transmission period. The power supply period and the data transmission period are succesApr. 3, 2006 (JP) ............................... .. 2006-101801 ' 1 rf d th td t ' t" "d db Jan. 18, 2007 (JP) ............................... .. 2007-009205 ts,1{,‘j,,y,§ O§rO",‘,§_bffpef,Od‘;‘ §‘,°t§$§f$1,°§‘ ,‘,°,fO§fa°fQeem,,ytef and the plurality of slaves. The master finely changes a com(5 1) Int‘ Cl‘ munication frequency in the data communication. The master H03K 3/017 (200001) changes a drive level of the bus within a predetermined (52) U.S. Cl. ...................................... .. 327/175; 327/172 aeeeptabje range in the data eemmunieatiett (58) Field of Classification Search ...................... .. None

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