Method of fabricating electronic device and limit value setting apparatus

A method of fabricating a plurality of electronic devices, each of the electronic devices including a port, an A/D converter, a memory, and a determination circuit, the determination circuit being configured to determine whether or not there is an abnormality by comparing an A/D converted value as a result of the A/D converter converting a voltage based on a power-supply voltage inputted to the port with a limit value stored in the memory, the method comprising steps of:

• during fabrication of each of the plurality of the electronic devices,
• a testing device inputting a predetermined voltage to the port of the electronic device to be fabricated, the predetermined voltage being common between the plurality of electronic devices to be fabricated;
• and
• the electronic device recording the limit value in the memory, the recording step comprising:
• the A/D converter of the electronic device converting a voltage based on the predetermined voltage inputted to the port;
• the testing device receiving from the electronic device the A/D converted value as a result of the A/D converter converting the voltage based on the predetermined voltage;
• the testing device in turn transmitting the A/D converted value received from the electronic device to the electronic device;
• and
• the electronic device recording the A/D converted value received from the testing device as the limit value in the memory.

A method of setting a limit value of an electronic device, the electronic device including a port, an A/D converter, a memory, and a determination circuit, the determination circuit being configured to determine whether or not there is an abnormality by comparing an A/D converted value as a result of the A/D converter converting a voltage based on a power-supply voltage inputted to the port with a limit value stored in the memory, the method comprising steps of:

• during fabrication of the electronic device,
• a testing device inputting a predetermined voltage to the port of the electronic device to be fabricated;
• and
• the electronic device recording the limit value in the memory, the recording step comprising:
• the A/D converter of the electronic device converting a voltage based on the predetermined voltage inputted to the port;
• the testing device receiving from the electronic device the A/D converted value as a result of the A/D converter converting the voltage based on the predetermined voltage;
• the testing device in turn transmitting the A/D converted value received from the electronic device to the electronic device;
• and
• the electronic device recording the A/D converted value received from the testing device as the limit value in the memory.

A limit value setting apparatus for applying a voltage to an electronic device, the electronic device including a port, an A/D converter, a memory, and a determination circuit, the determination circuit being configured to determine whether or not there is an abnormality by comparing an A/D converted value as a result of the A/D converter converting a voltage based on a power-supply voltage inputted to the port with a limit value stored in the memory, the apparatus comprising:

• a digital interface configured to, during set up of the limit value of the electronic device, transmit a command to the electronic device;
• an analog interface configured to, during set up of the limit value of the electronic device, apply a voltage to the port of the electronic device;
• and
• a control circuit configured to, during set up of the limit value of the electronic device, input a predetermined voltage to the port of the electronic device via the analog interface and transmit the command via the digital interface to receive from the electronic device an A/D converted value as a result of the A/D converter converting a voltage based on the predetermined voltage inputted to the port and transmit the A/D converted value received from the electronic device to the electronic device, thereby causing the electronic device to record the A/D converted value received from the apparatus as the limit value in the memory.

A limit value setting apparatus for applying a voltage to a plurality of electronic devices, each of the electronic device including a port, an A/D converter, a memory, and a determination circuit, the determination circuit being configured to determine whether or not there is an abnormality by comparing an A/D converted value as a result of the A/D converter converting a voltage based on a power-supply voltage inputted to the port with a limit value stored in the memory, the apparatus comprising:

• a digital interface configured to, during set up of the limit value of each of the plurality of the electronic devices, transmit a command to the electronic device;
• an analog interface configured to, during set up of the limit value of each of the plurality of the electronic devices, apply a voltage to the port of the electronic device, the voltage being common between the plurality of electronic devices;
• and
• a control circuit configured to, during set up of the limit value of each of the plurality of the electronic devices, input a predetermined voltage to the port of the electronic device via the analog interface and transmit the command via the digital interface to receive from the electronic device an A/D converted value as a result of the A/D converter converting a voltage based on the predetermined voltage inputted to the port and transmit the A/D converted value received from the electronic device to the electronic device, thereby causing the electronic device to record the A/D converted value received from the apparatus as the limit value in the memory.