JPH0592853U - Interface voltage measuring device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide an interface voltage measurement device capable of downsizing an interface IC and saving a board area. An external logic inversion circuit tool 6 is electrically connected to the external logic inversion circuit tool 6, and is connected to each of the terminals 1a to 1h of the interface 1, and the external logic inversion circuit tool 6 and the interface 1 are connected to each other. Each terminal 1a-1h
And an external connection component 7 for electrically connecting to each other.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an interface voltage measuring device.

[0002]

[Prior Art]

 To determine whether the interface is operating normally, voltage is measured on the interface transmit / receive terminals and each input / output port terminal.

FIG. 1 is a block diagram of an interface circuit with a voltage measuring circuit. In the figure, 1 is a serial interface IC for a modem (hereinafter referred to as an interface IC), 2 is a gate at the next stage of the interface IC 1, and 3 is a driver at the next stage. Further, 4 is a resistor (for example, about 33Ω) connected to each terminal of the interface IC 1, 5 is a switch connected in series with the resistor 4, and the resistor 4 and the switch 5 are for measuring the voltage of the interface IC 1. Of the logic inversion circuit.

Conventionally, since the logic inversion circuit is mounted and provided in the interface circuit, the interface IC chip becomes large, and the substrate area on which the IC chip is mounted must be widened. There was a problem.

An object of the present invention is to provide a device for measuring voltage of an interface, which can solve the above-mentioned drawbacks of the conventional device and can reduce the size of the interface IC and save the board area.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, according to the present invention, an external logic inverting circuit tool is electrically connected to the external logic inverting circuit tool, and is interfaced with the external logic inverting circuit tool while being attached to each terminal of the interface. The external connection parts that electrically connect each of the terminals are used.

[0007]

[Action]

 The voltage measuring device consisting of the external connection parts (hereinafter referred to as IC clip) connected by the lead wire and the external logic inversion circuit tool is separated from the interface circuit and independent, and as necessary. The voltage of each terminal of the interface IC is measured by measuring the voltage of the external logic inverting circuit tool when each terminal of the interface IC is sandwiched by the IC clip with a tester or the like.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a perspective view showing the interface IC and the voltage measuring device, 6 is an external logic inverting circuit tool having a large number of resistors 4 (the number corresponding to the interface IC 1) mounted, and 7 is a well-known IC clip. , 8 are lead wires for electrically connecting the external logic inverting circuit tool 6 and the IC clip 7, and these constitute a voltage measuring device.

As described above, the voltage measuring device according to the present invention is independent of the interface IC1, and the voltage of each terminal 1a to 1h (8 pins; 8 bits) of the interface IC1 is It is measured from the voltage across the resistor 4 when the terminals 1a to 1h of the interface IC 1 are sandwiched between the contacts of the IC clip 7. This voltage measurement is performed by a well-known tester. It goes without saying that the IC clip 7 is removed from the interface IC 1 except when measuring the voltage.

[0010]

[Effect of the device]

 As described above, in the present invention, since the voltage measuring device is provided separately from the interface circuit, the size of the interface IC can be reduced and the space for the board on which the interface IC is mounted can be reduced. You can

[Brief description of drawings]

FIG. 1 is an interface circuit diagram with a voltage measuring circuit.

FIG. 2 is a perspective view showing a voltage measuring device and an interface IC according to an embodiment of the present invention.

[Explanation of symbols]

 1 Interface IC 1a to 1h Terminal 4 Resistor 6 External Logic Inversion Circuit Tool 7 IC Clip (External Connection Parts) 8 Lead Wire

Claims (1)

[Scope of utility model registration request] 1. An external logic inversion circuit tool and an external logic inversion circuit tool are electrically connected to the external logic inversion circuit tool, and the external logic inversion circuit tool and each terminal of the interface are electrically connected to each terminal of the interface. A device for voltage measurement of an interface that consists of external connection components to be connected.