# US 11,030,139 B2 · Circuit device, circuit device determination method, and electronic apparatus

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- Number: US 11,030,139 B2
- Document ID: US11030139B2
- Status: Granted
- Kind: B2
- Application number: 16/828,022
- Filed: 2020-03-24
- Published: 2020-10-01
- Granted: 2021-06-08
- Earliest claimed: 2019-03-25
- Assignees: Seiko Epson Corporation
- Applicants: Seiko Epson Corporation
- Inventors: Kota Muto; Toshimichi Yamada
- Web page: https://patentgrep.com/patent/US11030139B2

## CPC

- G06F 13/4081: {Live connection to bus, e.g. hot-plugging (current or voltage limitation during live insertion H02H9/004)}
- G06F 13/4282: {on a serial bus, e.g. I2C bus, SPI bus (on daisy chain buses G06F13/4247)}
- H03K 19/0175: Coupling arrangements; Interface arrangements (interface arrangements for digital computers G06F3/00, G06F13/00)
- G06F 13/387: {for adaptation of different data processing systems to different peripheral devices, e.g. protocol converters for incompatible systems, open system}
- G06F 2213/0042: Universal serial bus [USB]
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M)

## Abstract

A circuit device includes a control circuit configured to instruct, when a detection circuit detects that an amplitude level of a packet exceeds a disconnecting detection level, a packet output circuit to lower an amplitude level of a part or all of packets, and after the instruction, to determine that, when the detection circuit detects that an amplitude level of a packet again exceeds the disconnecting detection level, a USB device connected to a bus is disconnected.

## Claims

### Claim 1

A circuit device comprising:
a packet output circuit configured to transmit a packet to a bus according to a USB standard in a manner capable of changing an amplitude level of the packet;
a detection circuit configured to detect whether an amplitude level of a packet transmitted to the bus exceeds a discoupling detection level; and
a control circuit configured to instruct, when the detection circuit detects that the amplitude level of the packet exceeds the discoupling detection level, the packet output circuit to lower an amplitude level of a part or all of packets, and after the instruction, to determine that, when the detection circuit detects that an amplitude level of a packet again exceeds the disconnecting detection level, a USB device connected to the bus is disconnected.

### Claim 2 (depends on 1)

The circuit device according to claim 1, wherein
D_th<2VL,
D_th being the disconnecting detection level, and
VL being the amplitude level of the packet output from the packet output circuit according to the instruction.

### Claim 3 (depends on 2)

The circuit device according to claim 2, wherein
DL<0.8VH,
VH being the amplitude level of the packet output from the packet output circuit before the instruction.

### Claim 4 (depends on 1)

The circuit device according to claim 1, wherein
the control circuit determines that the USB device is not disconnected from the bus when the detection circuit detects that, after the instruction, the amplitude level of the packet does not exceed the disconnecting detection level.

### Claim 5 (depends on 1)

The circuit device according to claim 1, wherein
the packet output circuit transmits a packet supplied to a bus different from the bus to the bus.

### Claim 6 (depends on 1)

An electronic apparatus comprising:
the circuit device according to claim 1; and
a central processing unit connected to the bus.