JPH0532782Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention mounts electronic components such as a flat package microprocessor on a printed circuit board without using a socket, and debugs the electronic components using a debugger. The present invention relates to a debugger connection structure that allows a debugger to be easily connected to a printed circuit board without reducing the mounting density of electronic components when necessary.

[Conventional technology]

Although there are many methods for debugging a device using a microprocessor, a method using an in-circuit emulator 1 as shown in FIG. 5 is often used.

This in-circuit emulator 1 is a device that performs the same operation as a microprocessor from the outside to debug the hardware and software of the device. It has a DIP type plug plug 5 that can be connected to a package type (hereinafter referred to as DIP type) socket 4.

Therefore, when debugging, it is necessary to remove the microprocessor 3 mounted in the socket 4 of the printed circuit board 2 and attach the plug plug 5 of the in-circuit emulator 1 to the socket 4 in its place. I am trying to do this by

[Problem that the invention attempts to solve]

However, in the conventional debugger connection structure described above, since the plug probe of the in-circuit emulator is only a DIP type, the microprocessor has a DIP type probe as described above. There is no problem if a DIP type socket is installed on the printed circuit board, but if a microprocessor has a flat package type (hereinafter referred to as FP type) probe on the printed circuit board, it is difficult to connect the microprocessor through the socket. If the in-circuit emulator is directly mounted without a probe, the in-circuit emulator cannot be directly connected and an adapter for probe conversion is required. In this case, if the probe shape of the adapter is an FP type, it will be necessary to place an FP type socket on the printed circuit board due to compatibility issues with the microprocessor, and the mounting space on the printed circuit board for the microprocessor will be taken up. The problem was that this increased size impeded the compactness characteristic of the FP type and hindered miniaturization and higher density of the overall system.

It is also possible to connect the DIP type plug probe of the in-circuit emulator directly to the printed circuit board without a conversion adapter, but in this case, a DIP type connector etc. to hold the plug probe can be connected to the microprogram. It is necessary to install a 3-state buffer around the setter and also insert a 3-state buffer into the output terminal of the microprocessor that does not become high impedance, so that all outputs of the microprocessor are in a high impedance state when connecting the in-circuit emulator probe. In this case as well, there is a problem that the area occupied by the connector etc. becomes large, which hinders miniaturization and high density of the entire system.

Therefore, the present invention was developed in view of the problems of the conventional methods described above, and it aims to reduce the size and density of debugger connections when flat package type electronic components are mounted directly on a printed circuit board. It is an object of the present invention to provide a debugger connection structure that allows a debugger to be easily connected without compromising the requirements of the debugger.

[Means for solving problems]

In order to achieve the above object, the present invention is characterized by forming engaging portions such as through holes, recesses, etc., near the electronic components on a printed circuit board on which flat package type electronic components are mounted without the use of sockets, and which are electrically connected to each terminal of the electronic components, and by providing an adapter having protruding terminals such as spring probes that engage with the engaging portions and which has a socket to which a debugger can be connected, and by engaging each of the terminals of the adapter with the engaging portions so that it can be detachably held on the printed circuit board.

[Effect]

In the present invention, an engaging portion electrically connected to each terminal is formed near a flat package type electronic component that is directly mounted on a printed circuit board without using a socket, and the engaging portion is electrically connected to each terminal of the electronic component. By engaging each terminal of an adapter to which the debugger can be connected, the debugger is connected via this adapter.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

Fig. 1 is an exploded view showing one embodiment of the present invention;
The figure is an enlarged plan view of a part of the printed circuit board.

In FIG. 1, 1 is an in-circuit emulator as a debugger having a dual inline package type (hereinafter referred to as DIP type) plug probe 5, and 2 is a flat package type (hereinafter referred to as FP type) plug probe 5.
A printed circuit board 6 is an adapter on which a microprocessor 3 (hereinafter referred to as a type) is directly mounted without using a socket.

As shown in FIG. 2, the printed circuit board 2 is provided with a plurality of mounting pads 7 to which terminals 3a of the microprocessor 3 are attached, and printed wiring 8 is connected to each of these mounting pads 7, respectively. has been done. At a position close to the mounting pad 7 of each printed wiring 8, there is a through hole 9 as an engaging part.
is drilled. Also, microprocessor 3
Terminals that do not have high impedance by themselves
As shown in FIG. 3, a 3-state buffer 11 is inserted in advance in tn up to the through hole 9 of the printed wiring 8, and the reset signal RST of the microprocessor 3 is supplied as its control signal. be done. Therefore, when the reset signal RST has a logical value of "1", the output side of the buffer 11 has a high impedance, and when the reset signal RST has a logical value of "0", it has a normal low impedance.

As shown in FIG.
A DIP type socket 12 is formed to attach the terminal, and a plurality of spring probes 13 as terminals are installed at the bottom.
are formed in a protruding manner corresponding to each through hole 9 of the printed circuit board 2. Here, the spring probe 13, as shown in an enlarged view in FIG.
Consisting of an outer cylinder 13a, a sliding shaft 13b slidably inserted into the outer cylinder 13a, and a spring 13c inserted between the upper end of the sliding shaft 13b and the bottom of the outer cylinder 13a. An inverted conical engagement portion 13d is attached to the lower end of the sliding shaft 13b. Each terminal of the socket 12 and each spring probe 9 are electrically connected in a predetermined correspondence relationship.

In addition, this is attached to the printed circuit board 2 in the adapter 6.
A holding mechanism 14 for removably holding on top is attached, for example, to both ends in the left and right direction. As shown in FIG. 4, this holding mechanism 14 is constructed by boring, for example, a square through hole 16 in a base 15 on which a spring probe 9 is formed to protrude, and a rectangular cylinder body 17 that protrudes downward into the through hole 16. This rectangular cylinder body 17
An engaging lever 19 is swingably mounted inside by a pin 18.
It has a configuration that supports. The engagement lever 19 has
A locking portion 20 having an inclined surface 20a that slopes upward to the right and a locking surface 20b extending leftward from the upper end thereof is formed at the tip portion protruding from the rectangular cylinder 17,
A coil spring 21 is interposed between the upper end thereof and the base 15, and the engagement lever 19 is biased counterclockwise. On the other hand, a through hole 22 is bored at a position corresponding to the rectangular cylinder 17 of the printed circuit board 2.

Next, the operation of the above embodiment will be explained.

To connect the in-circuit emulator 1 to the printed circuit board 2, first connect it to the microprocessor 3.
by supplying a reset signal RST with a logical value of “1” to
Put all output terminals into high impedance state.

In this state, the plug probe 5 of the in-circuit emulator 1 is attached to the socket 12 of the adapter 6, and each spring probe 13 of this adapter 6 is inserted into each through hole 9 of the printed circuit board 2.
The square cylinder body 17 of the holding mechanism 14
is made to face the through hole 22 of the printed circuit board 2. At this time, the engagement lever 19 of the holding mechanism 14 is biased counterclockwise by the coil spring 21, so that the inclined surface 20a of the locking portion 20 formed at the tip thereof is aligned with the through hole 22. touching the edge.
Therefore, in this state, by pressing down the adapter 6, the engagement lever 17 of the holding mechanism 14 rotates clockwise against the coil spring 21.
When the engagement between the inclined surface 20a and the edge of the through hole 22 is released, the engagement lever 19 returns clockwise due to the biasing force of the coil spring 21, and the engagement surface 20b moves as shown in FIG. As shown, printed circuit board 2
It is locked to the bottom of the At this time, in response to the pressing of the adapter 6, the engaging portions 13d of each spring probe 13 are inserted into each through hole 9 of the printed circuit board 2 with the spring 13c compressed, and the two are reliably electrically connected. Ru. Therefore, in this state, the adapter 6 is urged upward by the spring 13c of the spring probe 13, while the locking surface 20b of the engagement lever 19 of the holding mechanism 14 is pressed against the printed circuit board 2. Since it is locked to the bottom surface of the printed circuit board 2, it is reliably positioned and held on the printed circuit board 2.

With the adapter 6 held on the printed circuit board 2 in this manner, hardware and software can be debugged using the in-circuit emulator 1.

When debugging using the in-circuit emulator 1 is completed and the adapter 6 is to be removed from the printed circuit board 2, the engagement lever 19 of the holding mechanism 14 is rotated against the coil spring 21, and the engagement lever 19 is rotated against the coil spring 21. The adapter 6 can be easily removed by releasing the engagement between the stop surface 20b and the bottom surface of the printed circuit board 2 and pulling the adapter 6 upward.

In addition, in the above embodiment, the printed circuit board 2
Although a case has been described in which a through hole 9 is provided as an engaging portion, the present invention is not limited to this, and other engaging portions such as an engaging recess may also be applied.

Further, as the engagement terminal of the adapter 6, not only the spring probe 13 but also other conductive elastic members can be used.

Further, the holding mechanism 14 is not limited to the above embodiment, and any holding mechanism of any configuration can be applied. If the adapter 6 itself is somewhat heavy, the holding mechanism may be omitted and only the spring probe 13 may be used. Alternatively, the adapter 6 may be held by the holder.

[Effect of idea]

As explained above, according to the present invention, an engaging part is formed near the mounting position of a flat package type electronic component on a printed circuit board to be electrically connected to the terminal thereof, and a debugger can be connected to the engaging part. Since the adapter has a protruding terminal that engages with the engaging portion of the printed circuit board, it is extremely easy to connect and disconnect the adapter and the printed circuit board, and it is possible to connect the adapter to the printed circuit board without using a flat terminal. There is no need to provide a package type socket or dual in-line package type connector on the printed circuit board, which reduces costs and has the advantage of not compromising the requirements for miniaturization and high density of the overall configuration. It will be done.

Further, as in the above example, when the adapter is provided with a holding mechanism, there is an advantage that the adapter can be easily attached to and detached from the printed circuit board, and the terminals of the adapter can be positioned at the same time.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The figure is an enlarged plan view of the main parts of the printed circuit board, Figure 3 is a circuit diagram for explaining how to make the output terminal of the microprocessor into three states, and Figure 4 is a cross section showing the state in which the adapter is attached to the printed circuit board. FIG. 5 is a perspective view showing a conventional example. In the figure, 1 is an insert circuit emulator, 2 is a printed circuit board, 5 is a plug probe, 6 is an adapter, 7 is a mounting pad, 8 is a printed wiring, 9 is a through hole, 11 is a 3-state buffer, and 12 is a socket. , 13 is a spring probe, 14 is a holding mechanism, 19 is an engagement lever, 20 is a locking portion, and 22 is a through hole.

Claims (1)

[Claims for Utility Model Registration] (1) Forming an engaging portion electrically connected to each terminal of a printed circuit board on which a flat package type electronic component is mounted without using a socket, near the electronic component. At the same time, an adapter having protruding terminals that engage with the engaging portion and a socket to which a debugger can be connected is provided, and the adapter is placed on the printed circuit board so that each terminal thereof is engaged with the engaging portion. Debugger connection structure characterized by being able to be held in a detachable manner. (2) Utility model registration claim 1, wherein the engaging portion of the printed circuit board is formed by a through hole, and the terminal of the adapter is a spring probe.
Debugger connection structure described in section. (3) The debugger connection structure according to claim 1 or 2, wherein the adapter is provided with a holding mechanism that can be attached to and detached from the printed circuit board.