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Title:
SIGNAL DETECTION CIRCUIT AND HEATING DEVICE
Document Type and Number:
Japanese Patent JP2013137201
Kind Code:
A
Abstract:

To provide a signal detection circuit that can detect a signal input line being abnormally connected without increasing the number of components, is low cost, and meets the demand for size reduction.

In the signal detection circuit configured to input a detection signal of a thermistor TH to an A/D input port 11 of a microcomputer 1, a signal input line 2 to the A/D input port 11 is branched and connected to an input/output port 13 of the microcomputer 1. For diagnosis of a connection of the signal input line 2, the input/output port 13 is placed in an Hi-level output state, and it is determined from a current input value of the A/D input port 11 whether the signal input line 2 is abnormally connected. When the detection signal of the thermistor TH is read, the input/output port 13 is set as an input port.


Inventors:
HASEGAWA TOSHIAKI
OSHIO TADAHIKO
HIRANO TOMOHIRO
Application Number:
JP2011287352A
Publication Date:
July 11, 2013
Filing Date:
December 28, 2011
Export Citation:
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Assignee:
NORITZ CORP
International Classes:
G01R31/02; G01K15/00
Domestic Patent References:
JPH0390040U1991-09-13
JP2000356556A2000-12-26
JPS6276674U1987-05-16
JP2003240648A2003-08-27
JP2010230563A2010-10-14
JP2004157024A2004-06-03
JP2002041216A2002-02-08
JPS6337271A1988-02-17
JP2010230477A2010-10-14
Attorney, Agent or Firm:
Shogo Sano
Kiyoshi Samukawa



 
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