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Improved circuit of vehicle-mounted navigation key switch

A car navigation and switch technology, which is applied in the field of car navigation, can solve the problem of key strings and other problems, and achieve the effect of small junction resistance and small voltage drop difference

Pending Publication Date: 2019-12-31
WUHU HONGJING ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Close to the value of the adjacent key, resulting in a string of keys

Method used

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  • Improved circuit of vehicle-mounted navigation key switch

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Embodiment Construction

[0011] In order to deepen the understanding of the present invention, the present invention will be further described below in conjunction with examples, which are only used to explain the present invention and do not constitute a limitation to the protection scope of the present invention.

[0012] Such as figure 1 As shown, this embodiment provides an improved circuit for vehicle navigation key switches, including seven groups of switches No. 0 to No. 6 and six groups of triodes Q1 to Q6. One end of No. 0 switch is connected to the base of triode Q1, and No. 0 switch The other end of the series resistor R0 is connected to the power supply, the collector series resistor R1 of the triode Q1 is connected to the power supply, the transmitter of the triode Q1 is grounded, and the base of the triode Q1 is connected to the ground after the series resistor R10. One end of the No. 1 switch is connected to the base of the triode Q2, the other end of the No. 1 switch is connected to th...

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Abstract

The invention aims to provide an improved circuit of a vehicle-mounted navigation key switch. On the basis of a circuit of an AD voltage identification key, a triode and a resistor are additionally arranged on each switch; the small voltage drop difference of the C electrode and the E electrode of the triode in a saturated conduction state is skillfully utilized; the key switch has the advantagesthat the key switch is simple in structure, low in junction resistance and free of change of external factors and self factors, the key switch is only used for switching on a base loop of the triode to enable the triode to be in saturated conduction, the internal resistance of the key switch can be greatly changed, the circuit is reliable in operation as long as the triode is in saturated conduction, and the internal resistance of the switch has no influence on voltage division of the circuit.

Description

technical field [0001] The invention relates to the field of car navigation, in particular to an improved circuit of a car navigation key switch. Background technique [0002] At present, when controlling the car navigation, the button switch circuit is generally used for button control, and there are two ways to realize the button circuit of the car multimedia, one is the way of button matrix scanning, and the other is through the AD voltage. to realise. Due to the complexity of the circuit pins, the former uses more I / O ports of the single-chip microcomputer and has fewer applications. The latter uses less port resources of the single-chip microcomputer, and the software processing is simple, so it is widely used. In the circuit of the AD voltage identification button, when the button is pressed, the button is turned on and grounded, then the resistor connected to the button is divided by the pull-up resistor, and a voltage value is obtained at the ADKEY2 terminal. Accor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M11/20
CPCH03M11/20
Inventor 赵新华黄德波邱万富陈小兵孔令宏
Owner WUHU HONGJING ELECTRONICS
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