AU767291B2 - Method and apparatus for calibrating a resistive ladder switching matrix - Google Patents

Method and apparatus for calibrating a resistive ladder switching matrix Download PDF

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Publication number
AU767291B2
AU767291B2 AU16209/00A AU1620900A AU767291B2 AU 767291 B2 AU767291 B2 AU 767291B2 AU 16209/00 A AU16209/00 A AU 16209/00A AU 1620900 A AU1620900 A AU 1620900A AU 767291 B2 AU767291 B2 AU 767291B2
Authority
AU
Australia
Prior art keywords
cover
calibration element
contact
closed state
calibration
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
AU16209/00A
Other languages
English (en)
Other versions
AU1620900A (en
Inventor
Daniel D. Claxton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qualcomm Inc
Original Assignee
Qualcomm Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qualcomm Inc filed Critical Qualcomm Inc
Publication of AU1620900A publication Critical patent/AU1620900A/en
Application granted granted Critical
Publication of AU767291B2 publication Critical patent/AU767291B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M11/00—Coding in connection with keyboards or like devices, i.e. coding of the position of operated keys
    • H03M11/22—Static coding
    • H03M11/24—Static coding using analogue means, e.g. by coding the states of multiple switches into a single multi-level analogue signal or by indicating the type of a device using the voltage level at a specific tap of a resistive divider
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/0206—Portable telephones comprising a plurality of mechanically joined movable body parts, e.g. hinged housings
    • H04M1/0208—Portable telephones comprising a plurality of mechanically joined movable body parts, e.g. hinged housings characterized by the relative motions of the body parts
    • H04M1/0214—Foldable telephones, i.e. with body parts pivoting to an open position around an axis parallel to the plane they define in closed position
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/0206—Portable telephones comprising a plurality of mechanically joined movable body parts, e.g. hinged housings
    • H04M1/0241—Portable telephones comprising a plurality of mechanically joined movable body parts, e.g. hinged housings using relative motion of the body parts to change the operational status of the telephone set, e.g. switching on/off, answering incoming call
    • H04M1/0245—Portable telephones comprising a plurality of mechanically joined movable body parts, e.g. hinged housings using relative motion of the body parts to change the operational status of the telephone set, e.g. switching on/off, answering incoming call using open/close detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/23—Construction or mounting of dials or of equivalent devices; Means for facilitating the use thereof

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephone Set Structure (AREA)
  • Push-Button Switches (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Transmitters (AREA)
  • Analogue/Digital Conversion (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Telephone Function (AREA)
AU16209/00A 1998-11-13 1999-11-12 Method and apparatus for calibrating a resistive ladder switching matrix Ceased AU767291B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/191200 1998-11-13
US09/191,200 US6178388B1 (en) 1998-11-13 1998-11-13 Method and apparatus for calibrating a resistive ladder switching matrix
PCT/US1999/026853 WO2000030263A1 (en) 1998-11-13 1999-11-12 Method and apparatus for calibrating a resistive ladder switching matrix

Publications (2)

Publication Number Publication Date
AU1620900A AU1620900A (en) 2000-06-05
AU767291B2 true AU767291B2 (en) 2003-11-06

Family

ID=22704516

Family Applications (1)

Application Number Title Priority Date Filing Date
AU16209/00A Ceased AU767291B2 (en) 1998-11-13 1999-11-12 Method and apparatus for calibrating a resistive ladder switching matrix

Country Status (12)

Country Link
US (1) US6178388B1 (2)
EP (1) EP1131891B1 (2)
JP (1) JP4295924B2 (2)
KR (1) KR20010080446A (2)
CN (1) CN1168220C (2)
AT (1) ATE287592T1 (2)
AU (1) AU767291B2 (2)
CA (1) CA2350579C (2)
DE (1) DE69923343T2 (2)
HK (1) HK1042599B (2)
RU (1) RU2233539C2 (2)
WO (1) WO2000030263A1 (2)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE520689C2 (sv) * 1997-12-19 2003-08-12 Ericsson Telefon Ab L M Lock innefattande elekriska kalibreringsorgan, portabel anordning och sätt att tillverka ett lock
TW439366B (en) * 1999-11-19 2001-06-07 Darfon Electronics Corp Key scanning circuit
US6577250B1 (en) * 2000-05-19 2003-06-10 Microsoft Corporation Resistance based keyboard key discrimination
DE10044087A1 (de) * 2000-09-07 2002-04-04 Bosch Gmbh Robert Vorrichtung zur Aktivierung eines Steuergeräts
US6628216B2 (en) * 2002-02-13 2003-09-30 Intersil Americas Inc. Calibration of resistor ladder using difference measurement and parallel resistive correction
US8526950B2 (en) * 2003-12-30 2013-09-03 Nokia Corporation Determining handover based on state of mobile terminal
US7248195B2 (en) * 2005-11-30 2007-07-24 Symbol Technologies, Inc. Methods and apparatus for multiplexed digital inputs using an analog-to-digital converter
JP4578451B2 (ja) * 2006-09-15 2010-11-10 京セラ株式会社 電子機器
TWI307520B (en) * 2006-09-15 2009-03-11 Novatek Microelectronics Corp Key system utilizing two operation nodes to detect the status of a plurality of keys
US7639168B1 (en) * 2007-02-06 2009-12-29 Linear Technology Corporation Systems and methods for switch resistance control in digital to analog converters (DACs)
US10529506B2 (en) 2015-12-31 2020-01-07 Onespan North America Inc. Electronic apparatus comprising a linear keypad
RO132882A2 (ro) 2017-04-05 2018-10-30 Preh Gmbh Sistem şi metodă pentru citirea simultană a mai multor butoane sau senzori utilizând un singur pin analogic al unui microcontroler

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5619196A (en) * 1995-12-28 1997-04-08 Universal Electronics Inc. Single wire keyboard encode and decode circuit
WO1999033246A1 (en) * 1997-12-19 1999-07-01 Telefonaktiebolaget Lm Ericsson (Publ) Arrangements and a method relating to an apparatus containing electrical circuitry

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4015254A (en) * 1975-12-04 1977-03-29 General Motors Corporation Keyboard encoding circuit utilizing an A/D converter
US4118700A (en) * 1977-05-31 1978-10-03 Rca Corporation Single wire transmission of multiple switch operations
US4695840A (en) * 1985-09-03 1987-09-22 Mobil Oil Corporation Remote switch position determination using duty cycle modulation
US4884070A (en) * 1988-04-04 1989-11-28 California Institute Of Technology Method and apparatus for multiplexing switch signals
AT397311B (de) * 1991-08-16 1994-03-25 Hans Dr Leopold Verfahren zur bestimmung einer messgrösse sowie schaltungsanordnung zur durchführung des verfahrens
US5543588A (en) * 1992-06-08 1996-08-06 Synaptics, Incorporated Touch pad driven handheld computing device
US5510783A (en) * 1992-07-13 1996-04-23 Interlink Electronics, Inc. Adaptive keypad
DE4227149A1 (de) * 1992-08-17 1994-02-24 Hans Joachim Dr Ing Schuster Meßverfahren zur Ermittlung der Widerstandswerte ohmscher Widerstände, insbesondere Temperaturfühler
US5469364A (en) * 1993-03-15 1995-11-21 Hughey; Bradley W. Apparatus and methods for measuring and detecting variations in the value of a capacitor
US5515040A (en) * 1993-09-28 1996-05-07 Sejin Electron, Incorporated Methods of self-calibration for a key-type mouse
KR100203745B1 (ko) * 1996-05-27 1999-06-15 윤종용 에이디씨-키 패드 장치 및 그의 제어방법
US5900829A (en) * 1996-07-23 1999-05-04 Motorola, Inc. Method of and apparatus for detecting key actuations
US5798716A (en) * 1996-08-23 1998-08-25 Motorola, Inc. Method and apparatus for detecting key actuations
RU2121221C1 (ru) * 1996-09-27 1998-10-27 Государственное предприятие - Научно-исследовательский и проектно-конструкторский институт средств автоматизации на железнодорожном транспорте Кодирующее устройство для проверки систем телемеханики на сортировочных горках
FR2754399B1 (fr) * 1996-10-09 1998-12-04 Connexion Soc Nle Contacts tournants a effets auto-nettoyant

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5619196A (en) * 1995-12-28 1997-04-08 Universal Electronics Inc. Single wire keyboard encode and decode circuit
WO1999033246A1 (en) * 1997-12-19 1999-07-01 Telefonaktiebolaget Lm Ericsson (Publ) Arrangements and a method relating to an apparatus containing electrical circuitry

Also Published As

Publication number Publication date
KR20010080446A (ko) 2001-08-22
HK1042599B (zh) 2005-05-20
US6178388B1 (en) 2001-01-23
JP2002530764A (ja) 2002-09-17
RU2233539C2 (ru) 2004-07-27
HK1042599A1 (en) 2002-08-16
ATE287592T1 (de) 2005-02-15
EP1131891A1 (en) 2001-09-12
DE69923343D1 (de) 2005-02-24
WO2000030263A1 (en) 2000-05-25
CA2350579A1 (en) 2000-05-25
JP4295924B2 (ja) 2009-07-15
CN1342344A (zh) 2002-03-27
DE69923343T2 (de) 2006-05-04
AU1620900A (en) 2000-06-05
EP1131891B1 (en) 2005-01-19
CA2350579C (en) 2008-02-05
CN1168220C (zh) 2004-09-22

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Legal Events

Date Code Title Description
FGA Letters patent sealed or granted (standard patent)