# US 9,882,573 B2 · Method of fabricating electronic device and limit value setting apparatus

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- Number: US 9,882,573 B2
- Document ID: US9882573B2
- Status: Granted
- Kind: B2
- Application number: 14/901,706
- Filed: 2014-06-30
- Published: 2016-10-06
- Granted: 2018-01-30
- Earliest claimed: 2013-06-28
- Assignees: Denso Corporation
- Applicants: Denso Corporation
- Inventors: Soichiro Higuchi; Takamasa Ando; Yutaka Hasegawa
- Web page: https://patentgrep.com/patent/US9882573B2

## CPC

- H03M 1/1014: {at one point of the transfer characteristic, i.e. by adjusting a single reference value, e.g. bias or gain error (gain setting for range control H03M1/18)}
- H02H 3/006: {Calibration or setting of parameters}
- H02H 3/207: {also responsive to under-voltage (window comparators for indication G01R19/165)}
- H03M: CODING; DECODING; CODE CONVERSION IN GENERAL (using fluidic means F15C4/00; optical analogue/digital converters G02F7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C)
- H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H)

## Abstract

A method of fabricating an electronic device is provided, where the electronic device includes a port, an A/D converter, a memory, and a determination circuit. The determination circuit is 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 includes a step of inputting a predetermined voltage to the port of the electronic device to be fabricated, and a step of recording 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 as the limit value in the memory.

## Claims

### Claim 1

A method of fabricating 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.

### Claim 2 (depends on 1)

The method of claim 1, wherein
the determination circuit is configured to determine whether or not there is an abnormality based on whether or not the A/D converted value as a result of the A/D converter converting the voltage based on the power-supply voltage inputted to the port is out of a range between an upper limit and a lower limit stored in the memory,
the inputting step comprises inputting a predetermined high voltage to the port of the electronic device to be fabricated and inputting a predetermined low voltage to the port of the electronic device to be fabricated, and
the recording step comprises recording the A/D converted value as a result of the A/D converter converting a voltage based on the predetermined high voltage inputted to the port as the upper limit in the memory and recording the A/D converted value as a result of the A/D converter converting a voltage based on the predetermined low voltage inputted to the port as the lower limit in the memory.

### Claim 3

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.

### Claim 4

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.

### Claim 5

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.

### Claim 6 (depends on 5)

The apparatus of claim 5, wherein the determination circuit is configured to determine whether or not there is an abnormality based on whether or not the A/D converted value as a result of the A/D converter converting the voltage based on the power-supply voltage inputted to the port is out of a range between an upper limit and a lower limit stored in the memory, and the control circuit is configured to, during set up of the limit value of the electronic device, input a predetermined high voltage to the port of the electronic device via the analog interface and input a predetermined low voltage to the port of the electronic device via the analog interface, and transmit the command via the digital interface, thereby causing the electronic device to record an A/D converted value as a result of the A/D converter converting a voltage based on the predetermined high voltage inputted to the port as the upper limit in the memory and record an A/D converted value as a result of the A/D converter converting a voltage based on the predetermined low voltage inputted to the port as the lower limit in the memory.

### Claim 7

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.