Title:
MICROCOMPUTER INPUT/OUTPUT CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2018/211872
Kind Code:
A1
Abstract:
Provided is a microcomputer input/output circuit having a new structure capable of stably determining operation information corresponding to a divided voltage value without adding a component that leads to a cost increase and requiring a complicated calculation process. The microcomputer input/output circuit is provided with: a microcomputer 14; a power supply 16; a power supply resistor 18 having one end connected to the power supply 16 and the other end alternatively connected through a switch 20 to grounded external resistors 22a, 22b, 22c; a power supply voltage monitoring unit 36 capable of monitoring the power supply voltage; a divided voltage value monitoring unit 42 capable of monitoring a divided voltage value obtained from a voltage divided by the power supply resistor 18 and a selected one of the external resistors 22a, 22b, 22c; and an external resistor identifying means A for identifying one of the external resistors 22a, 22b, 22c selected by the switch 20, according to which divided voltage value range corresponding to each of the external resistors 22a, 22b, 22c the divided voltage value is included in. The external resistor identifying means A changes the divided voltage value range on the basis of the power supply voltage obtained by the power supply voltage monitoring unit 36.
Inventors:
TAKAHASHI HIROAKI (JP)
Application Number:
PCT/JP2018/015242
Publication Date:
November 22, 2018
Filing Date:
April 11, 2018
Export Citation:
Assignee:
SUMITOMO WIRING SYSTEMS (JP)
International Classes:
H02J1/00; B60R16/02; G01R31/319; G05F1/10; G06F1/28
Foreign References:
| JP2014033309A | 2014-02-20 | |||
| JPH0716237U | 1995-03-17 | |||
| JP2017077068A | 2017-04-20 | |||
| JP2015134526A | 2015-07-27 | |||
| US20120306557A1 | 2012-12-06 |
Attorney, Agent or Firm:
KASAI & NAKANE INTERNATIONAL PATENT FIRM et al. (JP)
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