| 摘要 |
PURPOSE: A multi input circuit is provided to remove an input selection switch for user convenience and to reduce the manufacturing cost by distinguishing a kind of current signals among a temperature sensor signal, an analog voltage signal and an analog current signal through a diode. CONSTITUTION: A multi input circuit(100) includes a first terminal(110), a second terminal(120), a third terminal(130) and a current unit detection unit(140). The multi input circuit includes a multiplexer(150), a power supply(160), a switch(170), a controller(180) and a key input unit(190). The controller outputs a control signal selecting an input port of the multiplexer according to selection of the key input unit and a control signal controlling on-off of the switch. The controller receives detection signal input to an input port of the multiplexer. An output terminal of the controller is connected to a RTD temperature sensor(300), a TC temperature sensor(400), a current unit(500), a display unit(200) displaying a detection signal of a voltage unit(600). [Reference numerals] (110) First terminal; (120) Second terminal; (130) Third terminal; (141) Switching element; (150) Multiplexer; (160) Power supply; (170) Switch; (180) Controller; (190) Key input unit; (200) Display unit; (300) RTD temperature sensor; (400) TC temperature sensor; (500) Current unit; (600) Voltage unit; (AA) Data selection signal |
