HK1035269A1 - Method and circuit for differentiating between input ranges in a passive keypad. - Google Patents

Method and circuit for differentiating between input ranges in a passive keypad.

Info

Publication number
HK1035269A1
HK1035269A1 HK01105876A HK01105876A HK1035269A1 HK 1035269 A1 HK1035269 A1 HK 1035269A1 HK 01105876 A HK01105876 A HK 01105876A HK 01105876 A HK01105876 A HK 01105876A HK 1035269 A1 HK1035269 A1 HK 1035269A1
Authority
HK
Hong Kong
Prior art keywords
differentiating
keypad
passive
circuit
input ranges
Prior art date
Application number
HK01105876A
Other languages
English (en)
Inventor
Richard J Kerr
Daniel D Claxton
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 HK1035269A1 publication Critical patent/HK1035269A1/xx

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/002—Provisions or arrangements for saving power, e.g. by allowing a sleep mode, using lower supply voltage for downstream stages, using multiple clock domains or by selectively turning on stages when needed
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/18—Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging
    • H03M1/186—Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging in feedforward mode, i.e. by determining the range to be selected directly from the input signal
    • H03M1/187—Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging in feedforward mode, i.e. by determining the range to be selected directly from the input signal using an auxiliary analogue/digital converter
    • 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
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2300/00—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H
    • H01H2300/022—Application wake up; switches or contacts specially provided for the wake up or standby shift of a circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/34—Analogue value compared with reference values
    • H03M1/36—Analogue value compared with reference values simultaneously only, i.e. parallel type
    • H03M1/361—Analogue value compared with reference values simultaneously only, i.e. parallel type having a separate comparator and reference value for each quantisation level, i.e. full flash converter type

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Analogue/Digital Conversion (AREA)
  • Electronic Switches (AREA)
HK01105876A 1998-05-22 2001-08-21 Method and circuit for differentiating between input ranges in a passive keypad. HK1035269A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US8363798A 1998-05-22 1998-05-22
PCT/US1999/011412 WO1999062180A1 (en) 1998-05-22 1999-05-21 Differentiating between input ranges in a passive keypad

Publications (1)

Publication Number Publication Date
HK1035269A1 true HK1035269A1 (en) 2001-11-16

Family

ID=22179696

Family Applications (1)

Application Number Title Priority Date Filing Date
HK01105876A HK1035269A1 (en) 1998-05-22 2001-08-21 Method and circuit for differentiating between input ranges in a passive keypad.

Country Status (12)

Country Link
EP (1) EP1086532B1 (ja)
JP (2) JP2002517119A (ja)
KR (1) KR100633209B1 (ja)
CN (1) CN1152472C (ja)
AU (1) AU764219B2 (ja)
BR (1) BR9910615A (ja)
CA (1) CA2333003C (ja)
DE (1) DE69920448T2 (ja)
ES (1) ES2229710T3 (ja)
HK (1) HK1035269A1 (ja)
TW (1) TW480830B (ja)
WO (1) WO1999062180A1 (ja)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6424274B1 (en) 1999-04-13 2002-07-23 Legerity, Inc. Keypad scanning with few pins
US6970752B1 (en) * 2000-05-17 2005-11-29 Hewlett-Packard Development Company, L.P. Method and apparatus for detecting switch closures
US7890284B2 (en) 2002-06-24 2011-02-15 Analog Devices, Inc. Identification system and method for recognizing any one of a number of different types of devices
US7783058B2 (en) 2002-06-24 2010-08-24 Analog Devices, Inc. System for verifying the identification of a device
US7912668B2 (en) 2002-06-24 2011-03-22 Analog Devices, Inc. System for determining the true electrical characteristics of a device
TWI230887B (en) 2003-07-31 2005-04-11 Htc Corp Keyboard with a detection circuit for generating a control signal
EP1521166B1 (en) 2003-10-02 2013-02-20 HTC Corporation Keyboard
US7030326B2 (en) * 2003-12-30 2006-04-18 Valeo Electrical Systems, Inc. Digital wake-up signal from analog signal transition
US7206952B2 (en) * 2003-12-30 2007-04-17 Valeo Electrical Systems, Inc. Digital wake-up signal from switch transition of two analog signals
JP4781006B2 (ja) * 2005-05-02 2011-09-28 キヤノン株式会社 電子機器
KR101503684B1 (ko) * 2007-06-18 2015-03-19 삼성디스플레이 주식회사 타이밍 컨트롤러, 이를 포함하는 액정 표시 장치 및 액정표시 장치의 구동 방법
DE102007043865B4 (de) * 2007-09-14 2011-06-16 Giesecke & Devrient Gmbh Eingabesperre
CN103391085B (zh) * 2012-05-10 2016-08-03 原相科技股份有限公司 共用一接脚以侦测多个按键的电路与方法及按键输入系统
GB2508612B (en) * 2012-12-04 2015-12-09 Cirrus Logic Int Semiconductor Ltd Interpretation circuit for a switch unit comprising a plurality of register blocks
TWI552034B (zh) 2014-10-29 2016-10-01 原相科技股份有限公司 用來將滑鼠切換於不同偵測模式的校正電路
CN105589582B (zh) * 2014-11-10 2018-04-10 原相科技股份有限公司 用来将鼠标切换于不同侦测模式的校正电路
US10529506B2 (en) 2015-12-31 2020-01-07 Onespan North America Inc. Electronic apparatus comprising a linear keypad
CN113285600B (zh) * 2021-07-26 2021-11-05 广东伊之密精密机械股份有限公司 电压自适应电路及plc控制器
CN114362509B (zh) * 2022-01-21 2024-05-14 珠海慧联科技有限公司 动态电压切换装置、tws芯片及tws设备

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5436455A (en) * 1977-08-29 1979-03-17 Hitachi Ltd Data processing system
JPS54144132A (en) * 1978-05-02 1979-11-10 Matsushita Electric Works Ltd Number collation switch
JPS58213330A (ja) * 1982-06-07 1983-12-12 Victor Co Of Japan Ltd キ−入力判別装置
US5343200A (en) * 1990-08-31 1994-08-30 Canon Kabushiki Kaisha Analog/digital converter with digital automatic gain control
JPH05313803A (ja) * 1992-05-01 1993-11-26 Funai Electric Co Ltd キースイッチ入力回路
JPH05327500A (ja) * 1992-05-13 1993-12-10 Nec Corp Ａ／ｄ変換回路
DE4328663C1 (de) * 1993-08-26 1994-06-09 Grundig Emv Einrichtung zur Abfrage von Bedienelementen
JPH09244711A (ja) * 1996-03-14 1997-09-19 Advantest Corp 多チャンネル制御装置
JP3381513B2 (ja) * 1996-04-12 2003-03-04 三菱電機株式会社 スイッチ回路

Also Published As

Publication number Publication date
CN1152472C (zh) 2004-06-02
JP2010081601A (ja) 2010-04-08
DE69920448D1 (de) 2004-10-28
BR9910615A (pt) 2001-10-02
WO1999062180A1 (en) 1999-12-02
JP2002517119A (ja) 2002-06-11
DE69920448T2 (de) 2005-09-22
CN1302478A (zh) 2001-07-04
KR100633209B1 (ko) 2006-10-11
EP1086532A1 (en) 2001-03-28
CA2333003C (en) 2008-01-08
TW480830B (en) 2002-03-21
CA2333003A1 (en) 1999-12-02
AU4096099A (en) 1999-12-13
EP1086532B1 (en) 2004-09-22
AU764219B2 (en) 2003-08-14
KR20010043761A (ko) 2001-05-25
ES2229710T3 (es) 2005-04-16

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Legal Events

Date Code Title Description
PC Patent ceased (i.e. patent has lapsed due to the failure to pay the renewal fee)

Effective date: 20110521