| CPC H05K 1/0266 (2013.01) [G01D 21/00 (2013.01)] | 11 Claims |
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1. An identification circuit for identifying one circuit board among a plurality of circuit boards, the identification circuit comprising:
a switching element configured to switch the one circuit board electrically connected to the identification circuit among the plurality of circuit boards;
a circuit element group electrically connected to the switching element; and
a controller electrically connected to the switching element and the circuit element group, wherein
upon an identification resistor and/or an identification capacitor being electrically connected to the circuit element group via the switching element, the controller is configured to measure a determination time, which is different for each circuit board, based on the connected identification resistor and/or the connected identification capacitor and to identify the one circuit board based on the measured determination time,
the identification circuit is electrically connected to the plurality of circuit boards via a connector, and
the circuit element group comprises:
a first resistor having one end connected to a reference voltage;
a second resistor connected in parallel to the first resistor and having one end connected to the reference voltage and the one end of the first resistor;
a third resistor connected in series to the second resistor and having one end grounded and another end connected to another end of the second resistor; and
a comparator having
a non-inverting input terminal connected to another end of the first resistor and the switching element,
an inverting input terminal connected to the other end of the second resistor and the other end of the third resistor, and
an output terminal connected to the controller.
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