Invention Grant
- Patent Title: Key scanning circuit
- Patent Title (中): 键扫描电路
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Application No.: US12422527Application Date: 2009-04-13
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Publication No.: US08164489B2Publication Date: 2012-04-24
- Inventor: Yong Il Kwon , Kyung Hee Hong , Sang Hoon Hwang , Tah Joon Park
- Applicant: Yong Il Kwon , Kyung Hee Hong , Sang Hoon Hwang , Tah Joon Park
- Applicant Address: KR Gyunggi-do
- Assignee: Samsung Electro-Mechanics Co., Ltd.
- Current Assignee: Samsung Electro-Mechanics Co., Ltd.
- Current Assignee Address: KR Gyunggi-do
- Agency: Lowe, Hauptman, Ham & Berner, LLP
- Priority: KR10-2008-0086468 20080902
- Main IPC: H03M11/00
- IPC: H03M11/00
Abstract:
In a key scanning circuit, a key input unit has a parallel connection of a plurality of circuits having a series connection of resistors and switches between a power supply input terminal and a key scanning terminal. The resistors connected in parallel have different resistances. A current mirror has a first terminal connected to the key scanning terminal. A reference current source is connected between a second terminal of the current mirror and the power supply input terminal.
Public/Granted literature
- US20100052952A1 KEY SCANNING CIRCUIT Public/Granted day:2010-03-04
Information query
