Card reading circuit and card reader
A card reader and circuit technology, applied in the field of card reading circuits, can solve the problems of incompatible reading of data cards, etc.
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[0015] In order to describe the technical content, structural features, achieved goals and effects of the present invention in detail, the following will be described in detail in conjunction with the embodiments and accompanying drawings.
[0016] see figure 1 and figure 2 , the present invention provides a card reading circuit, including a data card interface chip and a switch module, the switch module includes a card socket connector, a first resistor to a third resistor, a first MOS tube, a second MOS tube, the Both the card socket connector and the data card interface chip include I / O terminals; one end of the first resistor is connected to the I / O terminal of the card socket connector, and the other end of the first resistor is connected to the I / O terminal of the card socket connector. The drain of the first MOS transistor is connected; the source of the first MOS transistor is connected to the source of the second MOS transistor, and the common point of connection is...
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