Single-port wire converting circuit

Abstract

The invention discloses a single-port line converting circuit, which comprises an RC filter unit, an isolating circuit unit, an output amplification circuit unit and a jumper wire mode output selection unit, wherein the RC filter unit, the isolating circuit unit and the output amplification circuit unit are connected in sequence; the output amplification circuit unit comprises a current serial connection negative feedback circuit unit, a voltage parallel connection negative feedback circuit unit and an analogue quantity output unit; the isolating circuit unit is connected with a 1 end of an inserting pin of the jumper wire mode output selection unit, the current serial connection negative feedback circuit unit is connected with a 2 end of the inserting pin of the jumper wire mode output selection unit, and the voltage parallel connection negative feedback circuit unit is connected with a 3 end of the inserting pin of the jumper wire mode output selection unit; and the analogue quantityoutput unit is connected with the current serial connection negative feedback circuit unit and the voltage parallel connection negative feedback circuit unit respectively. Because the analogue quantity output mode of current, voltage, switch value and the like can be selected by jumper wires, the single-port wire converting circuit has the advantages of less port wire occupation, the selection ofmultiple output modes, low cost, high precision and the like.

Description

technical field [0001] The invention relates to the field of analog output circuits, in particular to a single-port line conversion circuit. Background technique [0002] Analog output circuits are widely used in industrial electronic products. At present, they mainly use integrated D / A chips provided by major semiconductor manufacturers. Using the integrated D / A chip to achieve analog output requires multiple ports to communicate with the D / A chip, configure registers, send commands, etc. The most commonly used SPI bus also needs 4 data lines; in addition, the integrated D / A The cost of the chip is high; the most important thing is that the output type of the D / A chip is single (current, voltage, and switching value need their own D / A chip output). Contents of the invention [0003] In order to overcome the existing analog output circuit using integrated D / A chip to realize analog output, it is necessary to use multiple ports to communicate with D / A chip, configure regis...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the existing analog output circuit using integrated D / A chip to realize analog output, it is necessary to use multiple ports to communicate with D / A chip, configure registers, send commands, etc. The most commonly used SPI bus also needs to have 4 In addition, the cost of integrated D / A chip is relatively high; the most important thing is the technical problem that the output type of D / A chip is single, the invention provides a kind of single-port line conversion circuit

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