KR102512726B1 - Apparatus for diagnosing external disconnection of integrated circuit chip and method thereof - Google Patents

Abstract

The present invention relates to an apparatus for diagnosing an external disconnection of an integrated circuit chip, comprising: a signal comparison unit that compares a signal output from an output terminal of an integrated circuit chip to be diagnosed with external disconnection with a designated reference voltage and outputs a comparison result; and selects a target pin to be diagnosed in the integrated circuit chip, outputs a corresponding diagnosis target pin selection signal to the signal comparator to adjust the reference voltage, and controls the target pin to be diagnosed based on the signal output from the signal comparator. It includes; a control unit for determining whether or not the wire is disconnected.

Description

APPARATUS FOR DIAGNOSING EXTERNAL DISCONNECTION OF INTEGRATED CIRCUIT CHIP AND METHOD THEREOF

The present invention relates to an apparatus and method for diagnosing an external disconnection of an integrated circuit chip, and more particularly, to an external disconnection diagnosis of an integrated circuit chip, which can diagnose both disconnection of power and ground pins connected to the outside of the integrated circuit chip. It relates to an apparatus and method.

In general, a plurality of electronic circuit boards for each function (ie, a printed circuit board to which various electronic parts for each function are attached) are installed inside a vehicle.

A circuit connecting power, ground, and electronic components is patterned on the electronic circuit board, and an integrated circuit chip for each function is attached to the center of the electronic circuit board, and an IC chip is attached to the periphery of the integrated circuit chip. It is common that a plurality of passive elements are soldered and attached.

In addition, power is supplied from the outside through a connector to the electronic circuit board and the integrated circuit chip (IC chip). More specifically, the connector is provided with a plurality of pins (or terminals) for power, ground, and signal input/output. Accordingly, when the connector is not normally connected (for example, when an external disconnection occurs in a power pin and a ground pin), the IC chip is not normally driven.

Accordingly, a circuit capable of diagnosing disconnection of an external pin internally of the IC chip (that is, disconnection of a pin externally connected to the chip through a connector or circuit pattern) can be implemented, but economical Due to reasons or circuit implementation reasons, most of the integrated circuit chips (IC chips) are not generally equipped with an external pin disconnection diagnosis function.

However, when an external disconnection (eg, bad connector connection, cold soldering, etc.) occurs in power and ground pins to be basically connected during the operation of an integrated circuit chip (IC chip), a fatal functional problem may occur.

Therefore, there is a need for a device capable of diagnosing both external disconnection of power and ground pins connected to the outside of the integrated circuit chip.

The background art of the present invention is disclosed in Republic of Korea Patent Publication No. 10-2014-0138893 (2014.12.04. Publication, method and apparatus for detecting disconnected wire state in integrated circuit).

According to one aspect of the present invention, the present invention was created to solve the above problems, and to diagnose all disconnection of power and ground pins connected to the outside of the integrated circuit chip, the outside of the integrated circuit chip Its purpose is to provide a disconnection diagnosis device and method.

An apparatus for diagnosing external disconnection of an integrated circuit chip according to an aspect of the present invention includes a signal comparison unit that compares a signal output from an output terminal of an integrated circuit chip to be diagnosed with external disconnection with a specified reference voltage and outputs the comparison result. ; and selects a target pin to be diagnosed in the integrated circuit chip, outputs a corresponding diagnosis target pin selection signal to the signal comparator to adjust the reference voltage, and controls the target pin to be diagnosed based on the signal output from the signal comparator. It is characterized in that it includes; a control unit for determining whether or not the wire is disconnected.

In the present invention, the target pin to be diagnosed for disconnection in the integrated circuit chip may include a power pin connected to the outside of the integrated circuit chip; and a ground pin; characterized in that all of them are included as diagnosis subjects.

In the present invention, the output pin of the integrated circuit chip is configured in a push-pull or open-drain type.

In the present invention, the control unit is characterized in that it outputs a high level or low level diagnosis target pin selection signal to the signal comparison unit.

In the present invention, the signal output from the output terminal of the integrated circuit chip is characterized in that a high level or low level signal is output according to a designated frequency.

In the present invention, the signal comparator may include: a transistor that is switched on/off according to a diagnosis target pin selection signal output from the control unit to adjust a reference voltage; and a comparator comparing a reference voltage adjusted according to the switching of the transistor with a signal output from an output terminal of the integrated circuit chip and outputting the comparison result to a digital input terminal of the control unit.

In the present invention, the controller outputs a high-level signal from the signal comparison unit when a high-level signal is output from the output terminal of the integrated circuit chip when diagnosing a disconnection of the ground pin, and When a low-level signal is output from the output terminal, if a low-level signal is also output from the signal comparator, it is determined that the ground pin is in a normal state, regardless of the level of the signal output from the output terminal of the integrated circuit chip, When a high-level signal is continuously output from the signal comparator, it is characterized in that it is determined that a disconnection has occurred in the ground pin.

In the present invention, the control unit outputs a high level signal from the signal comparator when a high level signal is output from an output terminal of the integrated circuit chip when diagnosing a disconnection of a power pin, and When a low-level signal is output from the output terminal, if a low-level signal is also output from the signal comparator, it is determined that the power pin is in a normal state, regardless of the level of the signal output from the output terminal of the integrated circuit chip, When a low-level signal is continuously output from the signal comparator, it is characterized in that it is determined that a disconnection has occurred in the power supply pin.

In the present invention, the reference voltage of the signal comparator is set to a voltage higher than the ground level and lower than a predetermined level than the offset voltage when diagnosing ground pin disconnection, and lower than the power level and lower than the floating voltage when diagnosing power pin disconnection. It is characterized in that it is set to a higher voltage than the specified level.

In a method for diagnosing an external disconnection of an integrated circuit chip according to another aspect of the present invention, a control unit compares a signal output from an output terminal of an integrated circuit chip to be diagnosed with an external disconnection through a signal comparator and a designated reference voltage, and compares the comparison result. receiving input; allowing the controller to adjust the reference voltage by selecting a target pin to be diagnosed on the integrated circuit chip and outputting a corresponding diagnosis target pin selection signal to the signal comparator; and determining, by the control unit, whether or not the target pin to be diagnosed is disconnected based on the signal output from the signal comparator.

In the present invention, in the step of selecting a target pin to be diagnosed on the integrated circuit chip and outputting the corresponding diagnosis target pin selection signal to the signal comparator, the control unit performs a high level or low level diagnosis on the signal comparator. Characterized in that it outputs a target pin selection signal.

In the present invention, the signal output from the output terminal of the integrated circuit chip is characterized in that a high level or low level signal is output according to a designated frequency.

In the present invention, in the step of determining whether or not the pin to be diagnosed is disconnected based on the signal output from the signal comparator, when diagnosing the disconnection of the ground pin, the control unit sets a high level at the output terminal of the integrated circuit chip. When the signal of is output, a high level signal is output from the signal comparator, and when a low level signal is output from the output terminal of the integrated circuit chip, if a low level signal is also output from the signal comparator, the ground pin It is determined that it is in a normal state, and when a high-level signal is continuously output from the signal comparator regardless of the level of the signal output from the output terminal of the integrated circuit chip, it is determined that a disconnection has occurred in the ground pin. do.

In the present invention, in the step of determining whether or not the pin to be diagnosed is disconnected based on the signal output from the signal comparison unit, when diagnosing the disconnection of the power supply pin, the control unit sets a high level at the output terminal of the integrated circuit chip. When the signal of is output, a high level signal is output from the signal comparator, and when a low level signal is output from the output terminal of the integrated circuit chip, if a low level signal is also output from the signal comparator, the power pin It is determined that it is in a normal state, and when a low level signal is continuously output from the signal comparator regardless of the level of the signal output from the output terminal of the integrated circuit chip, it is determined that a disconnection has occurred in the power supply pin. do.

In the present invention, the reference voltage of the signal comparator is set to a voltage higher than the ground level and lower than a predetermined level than the offset voltage when diagnosing ground pin disconnection, and lower than the power level and lower than the floating voltage when diagnosing power pin disconnection. It is characterized in that it is set to a higher voltage than the specified level.

According to one aspect of the present invention, it is possible to diagnose all disconnection of power and ground pins connected to the outside of an integrated circuit chip.

1 is an exemplary view showing a schematic configuration of an external disconnection diagnosis device of an integrated circuit chip according to an embodiment of the present invention.
2 is an exemplary diagram showing a schematic configuration of a device for diagnosing an external disconnection of an integrated circuit chip according to another embodiment of the present invention.
3 is an exemplary diagram showing a detailed configuration of a signal comparator in FIG. 1 or 2;
FIG. 4 is a flowchart illustrating a method in which a control unit determines whether a pin to be diagnosed in an integrated circuit (IC) chip is disconnected in FIG. 1 or 2;

Hereinafter, an embodiment of an apparatus and method for diagnosing an external disconnection of an integrated circuit chip according to the present invention will be described with reference to the accompanying drawings.

In this process, the thickness of lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of a user or operator. Therefore, definitions of these terms will have to be made based on the content throughout this specification.

1 is an exemplary view showing a schematic configuration of an external disconnection diagnosis device of an integrated circuit chip according to an embodiment of the present invention, and FIG. 2 is an exemplary diagram showing an external disconnection diagnosis device of an integrated circuit chip according to another embodiment of the present invention. It is an example diagram showing a schematic configuration.

As shown in FIG. 1, the apparatus for diagnosing an external disconnection of an integrated circuit chip according to the present embodiment includes an integrated circuit (IC) chip 10 to be diagnosed with an external disconnection, and the integrated circuit (IC) chip 10 A signal comparator 100 that compares a signal output from an output terminal with a designated reference level signal and outputs the comparison result, and a pin to be diagnosed in the integrated circuit (IC) chip 10 (e.g., a power pin) , ground pin) to output the corresponding diagnosis target pin selection signal to the signal comparator 100, and the target pin to be diagnosed (eg, power pin, ground) based on the signal output from the signal comparator 100 and a control unit 200 that determines whether a pin) is disconnected.

The integrated circuit (IC) chip 10 is an integrated circuit semiconductor mounted on a controller (or electronic circuit board) to perform a specific function in a vehicle.

The signal comparator 100 is a circuit including a plurality of passive elements R1 to R6, a transistor Q1 and a comparator OP1.

In addition, the signal comparator 100 selects and outputs target pins (eg, power pins and ground pins) to be diagnosed for disconnection in the integrated circuit (IC) chip 10 in the control unit 200 and outputs the selected pins. A selection signal is received, and a signal output from an output terminal of the integrated circuit (IC) chip 10 is compared with a designated reference level signal according to the pin selection signal to be diagnosed, and the comparison result is output ( see Figure 3).

For reference, in order to apply the signal comparator 100, the output pin of the integrated circuit (IC) chip 10 is a push-pull or open-drain type. Must be configured (eg SPI (Serial Peripheral Interface) MISO (Master In, Slave Out) pins).

The controller 200 outputs a diagnosis target pin selection signal (eg, a high or low level signal) to the signal comparator 100 through a designated output terminal GPIO1.

For example, when the diagnosis target pin selection signal (eg, High or Low level signal) output through the designated digital output terminal (GPIO1) of the control unit 200 is High, the disconnection of the power pin is diagnosed, and the If the pin selection signal to be diagnosed (eg, high or low level signal) is low, the ground pin disconnection is diagnosed.

At this time, although not specifically shown in the drawing, it is assumed that a high or low level signal is output from an output terminal of the integrated circuit (IC) chip 10 according to a designated frequency.

Meanwhile, in FIGS. 1 and 2 , when a signal output from an output terminal of the integrated circuit (IC) chip 10 is input to the controller 200 through the signal comparator 100, the Since a delay may occur in the signal output from the output terminal, the signal output from the output terminal of the integrated circuit (IC) chip 10 is directly received through a separate digital input terminal (GPIO3). Since there is a difference in that it is implemented to be possible, and there is no other difference in the configuration and operation of the remaining signal comparator 100 and control unit 200, a separate description of FIG. 2 will be omitted.

FIG. 3 is an exemplary view showing a detailed configuration of a signal comparator in FIG. 1 or 2 .

As shown in FIG. 3 , the signal comparator 100 adjusts a reference voltage by switching on/off according to a diagnosis target pin selection signal (eg, a high or low level signal) output from the control unit 200. The control unit 200 compares the signal output from the output terminal of the integrated circuit (IC) chip 10 with the reference voltage adjusted according to the switching of the transistor Q1 and the transistor Q1. ) includes a comparator (OP1) outputting to the digital input terminal (GPIO2).

In addition, although not shown in the drawing, a resistor for noise filtering, a capacitor, etc. may be additionally included in the input/output terminal of the comparator (OP1), and a feedback resistor or the like may be additionally included depending on the comparator (OP1).

The controller 200 determines whether a pin to be diagnosed (eg, a power pin or a ground pin) is disconnected based on a signal output from the signal comparator 100 .

Referring to FIG. 3, when the ground pin connected to the outside of the integrated circuit (IC) chip 10 is disconnected, the ground (GND) of the integrated circuit (IC) chip 10 and the controller (or electronic circuit board) There is a voltage difference between ground and ground.

For example, when outputting a low level signal through the output terminal of a normal integrated circuit (IC) chip 10 without disconnection, based on the ground of the integrated circuit (IC) chip 10 will output However, if a low level signal is output through the output terminal of the integrated circuit (IC) chip 10 where the ground pin disconnection occurred, the integrated circuit (IC) chip 10 and the controller An offset voltage due to a voltage difference between grounds of (or an electronic circuit board) is included to output a signal whose level has been increased.

Therefore, in the ground pin diagnosis mode, the signal output from the output terminal of the integrated circuit (IC) chip 10 (ie, the low level signal output from the output terminal when diagnosing ground pin disconnection) is converted to the signal comparator It is compared with the reference voltage specified in (100) (that is, the reference voltage set for diagnosing ground pin disconnection).

Accordingly, when the ground pin is in a normal state, the low level of the signal output from the output terminal of the integrated circuit (IC) chip 10 is lower than the reference voltage set for diagnosing the ground pin disconnection, and the integrated circuit When a high-level signal is output from the output terminal of the circuit (IC) chip 10, the same high-level signal is output from the signal comparator 100, and the integrated circuit (IC) When a low level signal is output from the output terminal of the chip 10, the same low level signal is also output from the signal comparator 100.

However, when the ground pin disconnection occurs in the integrated circuit (IC) chip 10, the low-level signal output from the output terminal of the integrated circuit (IC) chip 10 includes an offset voltage A level-up signal is output.

Accordingly, the signal comparator 100 outputs a low level signal (actually, a level-upped low level signal) output from the output terminal to a preset reference voltage (i.e., for diagnosing ground pin disconnection). When the level is higher than the level of the set reference voltage) and outputs a high level signal, and also outputs a high level signal from the output terminal, the signal comparator 100 also outputs a high level signal in the same way. print out

Therefore, when diagnosing ground pin disconnection, the control unit 200, regardless of the level of the signal output from the output terminal, the signal comparator 100 continuously outputs a high level signal. , it is determined that a ground pin disconnection has occurred in the integrated circuit (IC) chip 10.

Meanwhile, when the power pin connected to the outside of the integrated circuit (IC) chip 10 is disconnected, the output terminal of the integrated circuit (IC) chip 10 floats and does not output a normal high level signal. can not do it.

For example, when the power pin is in a normal state, when a high level signal is output from the output terminal, the signal comparator 100 also outputs the same high level signal, and the output terminal ( When a low level signal is output from the output), the signal comparator 100 also outputs a low level signal in the same way.

However, when the power pin of the integrated circuit (IC) chip 10 is disconnected, even if a high level signal is output from the output terminal, a signal at a level lower than the reference voltage set in the signal comparator 100 is generated. By being input, a low (LOW) output is continuously generated when power pin disconnection is diagnosed. That is, even if a high level signal is output from the output terminal, since the level is lower than the reference voltage set in the signal comparator 100, the signal comparator 100 outputs a low level signal, In addition, when a low level signal is output from the output terminal, the signal comparator 100 also outputs a low level signal in the same manner.

Therefore, when diagnosing power pin disconnection, the control unit 200 continuously outputs a low level signal from the signal comparator 100 regardless of the level of the signal output from the output terminal. It is determined that the power pin disconnection occurred in the integrated circuit (IC) chip 10 .

At this time, the controller 200 may output a diagnosis target pin selection signal to the signal comparator 100 through the digital output terminal GPIO1 to adjust the reference voltage inside the signal comparator 100 .

For example, when diagnosing ground pin disconnection, the reference voltage set in the signal comparator 100 may be set to a voltage higher than the ground level and slightly (preset level) lower than the offset voltage, and comparing the signal when diagnosing power pin disconnection. The reference voltage set in the unit 100 may be set to a voltage lower than the power supply level and slightly (preset level) higher than the floating voltage.

Therefore, the control unit 200 periodically (or according to a user's designation) outputs a high or low level diagnosis target pin selection signal to the signal comparison unit 100, so that the signal comparison unit ( 100) Change the internal reference voltage, and based on the result of comparing the changed reference voltage with the level of the signal output from the output terminal, the external power pin or ground of the integrated circuit (IC) chip 10 It is possible to diagnose whether a pin is disconnected.

FIG. 4 is a flowchart illustrating a method in which a control unit determines whether a pin to be diagnosed is disconnected in an integrated circuit (IC) chip in FIG. 1 or 2. Referring to FIG.

Referring to FIG. 4 , when the controller 200 wants to diagnose a disconnection of the power pin of the integrated circuit (IC) chip 10 (yes in S101), the controller 200 sends the signal comparator 100 A designated diagnosis target pin selection signal (eg, high level signal) is output (S102).

Accordingly, the internal reference voltage of the signal comparator 100 is adjusted.

For example, when diagnosing power pin disconnection, the reference voltage set in the signal comparator 100 may be set to a voltage slightly higher than the floating voltage.

Accordingly, the signal comparator 100 connects a signal periodically output with a low level and a high level from the output terminal of the integrated circuit (IC) chip 10 and the reference voltage (floating for diagnosing power pin disconnection) A voltage set higher than a predetermined level) is compared and output to the control unit 200 (S104).

At this time, if the power pin of the integrated circuit (IC) chip 10 is disconnected, the signal output from the output terminal of the integrated circuit (IC) chip 10 periodically changes to a low level and a high level. Even if it is changed, the signal comparator 100 continuously outputs only one level (eg, low level) signal.

Therefore, when a normal level signal (ie, a signal in which a low level and a high level are periodically changed) of a corresponding diagnosis pin (ie, a power pin) is input from the signal comparator 100 for more than a specified time to the control unit 200 (YES in S105), the control unit 200 determines that the corresponding diagnostic pin (ie, power supply pin) is not disconnected and is in a normal state (S106).

However, if an abnormal level signal (ie, a continuous low level signal) of the corresponding diagnostic pin (ie, power pin) is input from the signal comparison unit 100 for more than the time specified in the control unit 200 (No in S105), The control unit 200 determines that the corresponding diagnostic pin (ie, power pin) is disconnected (S107).

On the other hand, when the control unit 200 attempts to diagnose a disconnection of the ground pin of the integrated circuit (IC) chip 10 (No in S101), the control unit 200 determines the diagnosis target pin assigned to the signal comparator 100. A selection signal (eg, a high level signal) is output (S103).

Accordingly, the internal reference voltage of the signal comparator 100 is adjusted.

For example, when diagnosing a ground pin disconnection, the reference voltage set in the signal comparator 100 may be set to a voltage slightly higher than the offset voltage.

Accordingly, the signal comparator 100 connects a signal periodically output with a low level and a high level from an output terminal of the integrated circuit (IC) chip 10 and the reference voltage (offset for diagnosing a ground pin disconnection). A voltage set lower than a predetermined level) is compared and output to the control unit 200 (S104).

At this time, if the ground pin of the integrated circuit (IC) chip 10 is disconnected, the signal output from the output terminal of the integrated circuit (IC) chip 10 periodically changes to a low level and a high level. Even if it is changed, the signal comparator 100 continuously outputs only one level (eg, high level) signal.

Therefore, when a normal level signal (ie, a signal in which a low level and a high level are periodically changed) of the corresponding diagnostic pin (ie, ground pin) is input from the signal comparator 100 for more than a specified time to the control unit 200 (Yes in S105), the control unit 200 determines that the diagnostic pin (ie, the ground pin) is in a normal state and is not disconnected (S106).

However, if an abnormal level signal (ie, a continuous high level signal) of the corresponding diagnostic pin (ie, ground pin) is input from the signal comparison unit 100 for more than the time specified in the control unit 200 (No in S105), The control unit 200 determines that the corresponding diagnostic pin (ie, ground pin) is disconnected (S107).

As described above, the present embodiment has an effect of diagnosing all disconnection of power and ground pins connected to the outside of the integrated circuit chip.

The present invention has been described above with reference to the embodiments shown in the drawings, but this is only exemplary, and those skilled in the art can make various modifications and equivalent other embodiments. you will understand the point. Therefore, the technical protection scope of the present invention should be determined by the claims below. Implementations described herein may also be embodied in, for example, a method or process, an apparatus, a software program, a data stream, or a signal. Even if discussed only in the context of a single form of implementation (eg, discussed only as a method), the implementation of features discussed may also be implemented in other forms (eg, an apparatus or program). The device may be implemented in suitable hardware, software and firmware. The method may be implemented in an apparatus such as a processor, which is generally referred to as a processing device including, for example, a computer, microprocessor, integrated circuit, programmable logic device, or the like. Processors also include communication devices such as computers, cell phones, personal digital assistants ("PDAs") and other devices that facilitate communication of information between end-users.

10: Integrated circuit (IC) chip subject to external disconnection diagnosis
100: signal comparison unit
200: control unit

Claims (15)

a signal comparison unit that compares a signal output from an output terminal of an integrated circuit chip to be diagnosed with an external disconnection with a designated reference voltage and outputs a comparison result; and
In the integrated circuit chip, a target pin to be diagnosed for disconnection is selected, and a corresponding diagnosis target pin selection signal is output to the signal comparator to adjust the reference voltage. A control unit for determining whether the target pin is disconnected;
The control unit,
A power pin or a ground pin connected to the outside of the integrated circuit chip is selected through the diagnosis target pin selection signal, and
The control unit,
In preparation for the delay of the signal output from the output terminal of the integrated circuit chip, it is characterized in that implemented so that the signal output from the output terminal of the integrated circuit chip can be directly input through a separate digital input terminal (GPIO3) Device for diagnosing external disconnection of an integrated circuit chip.
delete The method of claim 1, wherein the output terminal of the integrated circuit chip,
A device for diagnosing an external disconnection of an integrated circuit chip, characterized in that it is configured in a push-pull or open-drain form.
The method of claim 1, wherein the control unit,
The device for diagnosing an external disconnection of an integrated circuit chip, characterized in that for outputting a high level or low level diagnosis target pin selection signal to the signal comparator.
The method of claim 1, wherein the signal output from the output terminal of the integrated circuit chip,
A device for diagnosing external disconnection of an integrated circuit chip, characterized in that a high level or low level signal is a signal output according to a designated frequency.
The method of claim 1, wherein the signal comparison unit,
a transistor that is switched on/off according to a diagnosis target pin selection signal output from the control unit to adjust a reference voltage; and
and a comparator comparing a reference voltage adjusted according to the switching of the transistor with a signal output from an output terminal of the integrated circuit chip and outputting the comparison result to a digital input terminal of the control unit. external disconnection diagnostic device.
The method of claim 1, wherein the control unit,
When diagnosing ground pin disconnection,
When a high-level signal is output from the output terminal of the integrated circuit chip, a high-level signal is also output from the signal comparison unit, and when a low-level signal is output from the output terminal of the integrated circuit chip, the signal comparison unit also outputs a high-level signal. When a low-level signal is output, it is determined that the ground pin is in a normal state,
Regardless of the level of the signal output from the output terminal of the integrated circuit chip, if the signal comparator continuously outputs a high level signal, it is determined that a ground pin is disconnected. diagnostic device.
The method of claim 1, wherein the control unit,
When diagnosing power pin disconnection,
When a high-level signal is output from the output terminal of the integrated circuit chip, a high-level signal is also output from the signal comparison unit, and when a low-level signal is output from the output terminal of the integrated circuit chip, the signal comparison unit also outputs a high-level signal. When a low-level signal is output, it is determined that the power pin is in a normal state;
Regardless of the level of the signal output from the output terminal of the integrated circuit chip, when a low-level signal is continuously output from the signal comparator, it is determined that a disconnection has occurred in the power supply pin External disconnection of the integrated circuit chip, characterized in that diagnostic device.
The method of claim 1, wherein the reference voltage of the signal comparator is
When diagnosing a ground pin break, it is set to a voltage higher than the ground level and lower than a predetermined level than the offset voltage,
A device for diagnosing external disconnection of an integrated circuit chip, characterized in that, when diagnosing power pin disconnection, the voltage is set to a voltage lower than the power level and higher than a predetermined level than the floating voltage.
Comparing, by a control unit, a signal output from an output terminal of an integrated circuit chip to be diagnosed for external disconnection with a designated reference voltage through a signal comparator and receiving a result of the comparison;
allowing the control unit to select a target pin to be diagnosed for disconnection in the integrated circuit chip and output a corresponding diagnosis target pin selection signal to the signal comparator to adjust the reference voltage; and
Determining, by the control unit, whether or not the target pin to be diagnosed is disconnected based on the signal output from the signal comparator;
The control unit,
A power pin or a ground pin connected to the outside of the integrated circuit chip is selected through the diagnosis target pin selection signal, and
The control unit,
In preparation for the delay of the signal output from the output terminal of the integrated circuit chip, it is characterized in that implemented so that the signal output from the output terminal of the integrated circuit chip can be directly input through a separate digital input terminal (GPIO3) A method for diagnosing external disconnection of an integrated circuit chip.
11. The method of claim 10, wherein in the step of selecting a target pin to be diagnosed in the integrated circuit chip and outputting a corresponding diagnosis target pin selection signal to the signal comparator,
The control unit,
A method for diagnosing an external disconnection of an integrated circuit chip, characterized in that for outputting a high level or low level diagnosis target pin selection signal to the signal comparator.
11. The method of claim 10, wherein the signal output from the output terminal of the integrated circuit chip,
A method for diagnosing an external disconnection of an integrated circuit chip, characterized in that a high level or low level signal is a signal output according to a designated frequency.
11. The method of claim 10 , wherein in the step of determining whether a target pin to be diagnosed is disconnected based on a signal output from the signal comparator,
When diagnosing ground pin disconnection,
When a high level signal is output from the output terminal of the integrated circuit chip, a high level signal is output from the signal comparator, and a low level signal is output from the output terminal of the integrated circuit chip. When a low-level signal is output from the signal comparator, it is determined that the ground pin is in a normal state,
Regardless of the level of the signal output from the output terminal of the integrated circuit chip, if the signal comparator continuously outputs a high level signal, it is determined that a ground pin is disconnected. diagnostic method.
11. The method of claim 10 , wherein in the step of determining whether a target pin to be diagnosed is disconnected based on a signal output from the signal comparator,
When diagnosing power pin disconnection,
When a high level signal is output from the output terminal of the integrated circuit chip, a high level signal is output from the signal comparator, and a low level signal is output from the output terminal of the integrated circuit chip. If the signal comparator also outputs a low-level signal, it is determined that the power pin is in a normal state,
Regardless of the level of the signal output from the output terminal of the integrated circuit chip, when a low-level signal is continuously output from the signal comparator, it is determined that a disconnection has occurred in the power supply pin External disconnection of the integrated circuit chip, characterized in that diagnostic method.
11. The method of claim 10, wherein the reference voltage of the signal comparator is,
When diagnosing a ground pin break, it is set to a voltage higher than the ground level and lower than a predetermined level than the offset voltage,
A method for diagnosing external disconnection of an integrated circuit chip, characterized in that, when diagnosing power pin disconnection, the voltage is set to a voltage lower than the power level and higher than a predetermined level than the floating voltage.

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